Kev's Easy Sport 40 Build Thread. - Printable Version

+- Parramatta Radio Control Aircraft Club (https://forum.rcflyingclub.com)
+-- Forum: Forums (https://forum.rcflyingclub.com/forumdisplay.php?fid=7)
+--- Forum: General (https://forum.rcflyingclub.com/forumdisplay.php?fid=3)
+--- Thread: Kev's Easy Sport 40 Build Thread. (/showthread.php?tid=98)

---

Kev's Easy Sport 40 Build Thread. - ~KevJ~ - 19-06-2009

Hi guys,
Some of you ive met(kieren,darren,inga,chris,victor) and alot i have not , ive visited the fields a couple of times now (im Paul's Son) and plan on getting down there a whole lot more as i get airbourne, in the mean time i thought i'd throw up abit of a build thread of my first attempt to build any model really.. :!:

i wont lie to you, im in the trenches here, ive glued my thumb so bad i had to cut it off the wing rib with a stanley and ive thin CA'd my entire palm to the the centre sheeting of the wing, ive cut some pieces short and ive incurred the wrath of my missus regularly for turning the dining room table into a construction zone...

[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/P6150132.jpg[/autoimg]

BUT... i am moving forward and learning and thats the main thing
as the topic suggests the plane is a great planes easy sport 40 which im going to convert to brushless electric instead of the os40 glow motor i have here for it , i have nitro cars and whilst i love them i am looking forward to the planes being a more "clean" hobby...

anyways down to the guts of it , more or less i thought id just post progress pics along the way and ask afew questions when i get to the business end of the build. thanks for taking the time to look guys ill see you down the field.. 8-)

oh yes there is an extreme over use of epoxy and CA in some areas as i was scared it would not be strong enough,first time user of many of these products and now i can safely say i have a better understanding of the strength, consistency and speed! of various different glues, i guess thats why i have lost feeling in all my fingertips and i doubt very much the FBI could get a print from my hands :roll:

tail sections..

early wing work..
[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/P5290115.jpg[/autoimg]
servo tray..
[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/P6140123.jpg[/autoimg]
sheeting , test fit servo..
[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/P6150130.jpg[/autoimg]
wing tips(still need to shape..
[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/P6150125.jpg[/autoimg]
[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/P6150128.jpg[/autoimg]
aeilerons hinge slots done, not much left on wing to do.. hoping to start fuesalage early this week pending on family commitments..
[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/P6150127.jpg[/autoimg]

cheers guys hope the weather clears for you, this wekend looks bad , perhaps the gods will smile on next weekend

---

Re: Kev's Easy Sport 40 Build Thread. - ~KevJ~ - 19-06-2009

hmm i cut off all the right hand sides of my pics, not sure why but you can see enough..

---

Re: Kev's Easy Sport 40 Build Thread. - kizza42 - 19-06-2009

Looks awesome Kev, You're attempting stuff that still scares the bejesus out of me!

The right side of the pictures are still there but the forum theme cut them off at 670px. But I've since rectified it.

To fix this, I installed a mod that will auto thumbnail images, just use the Autoimg button instead of the Img button in future, alternatively you can attach your images directly to the post to save you the hassle of uploading to photobucket, I've set some generous upload limits to cater for this. You can also hotlink the images elsewhere as well.

---

Re: Kev's Easy Sport 40 Build Thread. - paulj - 19-06-2009

Great to see that you are doing so well.
I've had that kit for close to 12 years and never got around
to building it, you get for 2 weeks and have made so much progress.

Hope Tammy doesn't get too upset with you

See you on the weekend

Dad

---

Re: Kev's Easy Sport 40 Build Thread. - robair - 19-06-2009

Don't sweat it Kev, my Living Room is routinely "reassigned" for more noble purposes. My daughters spare High Chair also makes a great temporary workbench.

Cheers
Rob B

---

Re: Kev's Easy Sport 40 Build Thread. - ~KevJ~ - 20-06-2009

thanks for the vote of confidence rob , also thats a great looking plane you have there...

is that a cub? did you build that one from kit?

---

Re: Kev's Easy Sport 40 Build Thread. - robair - 21-06-2009

Gday Kev

It is a Piper J3 Cub ARF from Thunder Tiger, due to the crap weather I have had plenty of time to customise it. I am working on a full scale interior and have almost completed a scratchbuilt instrument panel, I also nicked a small bear soft toy from my daughter that will be beheaded and reinstalled, I intend to have the head turn as per the rudder movement. Also hope to complete exhausts and oil cooler for the cowl today. Planning the engine cylinders however am trying to get some cooling vents as part of this which is proving a bit tricky as I need it to still be all in scale. Power will be an E-Flite 46 on 4S.

Cheers
Rob B

---

Re: Kev's Easy Sport 40 Build Thread. - ~KevJ~ - 21-06-2009

sounds great rob from what i can tell thats a 2.1 metre wingspan if its the same one i was checking out from modelflight.com, thats a nice size detailed model.. i look forward to checking it out down the field one day, do you have any expectations for run time with that 46 on 4s combo :?: im currently exploring all different options for this easy sport of mine and i want something with plenty of guts as underpowered planes scare me :? ... :idea:

---

Re: Kev's Easy Sport 40 Build Thread. - ~KevJ~ - 22-06-2009

just a quick update on my build,
Saturday: finished wing and tail completely all hinges and moving parts done, wingtips and trailing edges shaped just need to cover wing and glue hinges after fueselage built. ..(stopped there as the bourbon cans were beginning to stack and i had visions of my hand sticking to the wing again... )

Sunday: began fueselage completed both side walls and firewall .... then ran out of glue .. DOH :!:

[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/P6180133.jpg[/autoimg]
[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/P6180135.jpg[/autoimg]
[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/P6180136.jpg[/autoimg]
[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/P6180134.jpg[/autoimg]

also haven't decided on which colour ie blue or red striped but here is a couple of samples of the paint scheme i want to run on it , and yeah i know my plane isnt the same as these ones but i just love the look of them.

[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/P6180138.jpg[/autoimg]
[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/P6180139.jpg[/autoimg]

now to get me some more glue... :roll:

---

Re: Kev's Easy Sport 40 Build Thread. - kizza42 - 22-06-2009

I would pick the red over the blue, not that colours reeeeally matter whilst flying as your distance vision is greyscale and what you really want on your plane is some nice contrasting geometric shapes.

The original site with picture examples is down but here is a good read on how to colour your aircraft for maximum visibility:
http://www.jcrc.com/News/Articles/Artic ... Theory.htm
or here if that link disappears:
http://www.whirlwinds-of-swmi.org/color ... odels.html

As for flight times, Amp loads etc. Nothing is 100% accurate to real world scenarios but these programs might be a good start:
http://www.drivecalc.de
http://www.motocalc.com/data.htm

Drivecalcs predictions for my Decathlon power setup were pretty close but it doesn't have the Power46 in its database of known motors so try motocalc (I've run out of demo time on my computer)

---

Re: Kev's Easy Sport 40 Build Thread. - ~KevJ~ - 22-06-2009

Quote: but here is a good read on how to colour your aircraft for maximum visibility

thanks kizza that was a great article on graphic design of the aircraft, his recommended beginner design is pretty much exactly what i want and very similar to what i had in my head already..

have you got any good links to the actual process of covering the frame and applying the design? if not no matter ill google around anyhow...

---

Re: Kev's Easy Sport 40 Build Thread. - kizza42 - 22-06-2009

I'll have to defer there, I've never done any covering myself and its probably one of the most daunting things in my mind: The iron's gotta be at the right temp, You gotta move at a certain speed, Too slow and it burns, too fast and it doesn't shrink evenly etc.

---

Re: Kev's Easy Sport 40 Build Thread. - robair - 23-06-2009

Gday Kev, don't let Kieran being a big chicken put you off. Covering is actually quite simple if you get the iron temp right and tack in the right places, I am happy to assist with this, also don't forget Darren he has probably covered an area similar to a 747 wing over the years. For me it is an enjoyable part of modelling as it is the point that you go from a collection of balsa to an aircraft.

---

Re: Kev's Easy Sport 40 Build Thread. - ~KevJ~ - 25-06-2009

Hey guys, ive taken the last couple of days since i havent had a chance to get down the LHS to get some glue to try and put myself through a crash course in brushless systems.. i have read and taken in what i can but still i feel "overwhelmed" by the whole range of options.. :?

if anyone gets the chance to check it out ive been eyeing off the following motor from hobbyking..

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=6231&Product_Name=TR_42-60C_500Kv_Brushless_Outrunner

i had taken a look at victors ep converted balsa setup last time i was at the field but when i looked up his motor number i noticed it was suggesting that it was a 0.3 - 0.35 glow replacement size and it concerned me as i really would rather be overpowered than underpowered (i figure it is better to throttle back than to not have the extra balls to climb when needed ).
after all my airplane is looking at coming out at around the 3kg mark and 60" span...

anyway my question i guess is does anyone have any suggestions for a suitable esc for this motor on the hobbyking website? (im thinking 60a, but could be way off)
*EDIT* im looking at this esc to suit , does anyone have experience with any hextronic products?

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=4315&Product_Name=hexTronik_PRO_80A_BESC_w/_PC_Programmability

im also thinking a 4s battery would be a good size and perhaps a 15 x 10 or 14 x 8 prop(will read more on prop choice tommorow, im totally lost on this still ) .. im trying to use suggestions from the hobbyking reviews but when ppl talk about what battery they are using in the comments they say things like 4100mah 4s.. i understand that but how does one determine what C rating would be appropriate? ie 4100mah 4s 25C or 30C :?:

any :idea: advice or comments welcome guys as im very much in the learning stage..

cheers , fingers crossed for some action at the field this sunday.

---

Re: Kev's Easy Sport 40 Build Thread. - kizza42 - 25-06-2009

My Understanding is:
4100mAh battery at 1C(apacity) = 4.1amps

A battery with a 25C dischage capacity means it can safely handle 25 times that so:

25x4.1 = 102.5 amps

You aren't necessarily gonna pull anywhere near that or want to as that will limit your batteries life.

Consider 5S - 6S to keep the amps down. The motors are rated in Revs per volt so the more volts (Cells) you can chuck at these larger motors, the better.

To ease the pain of larger batteries you could buy two 3 cell batteries and wire them in series to get your 6S and pull em apart to run in smaller things (Converted buggies, Strykers etc )

When I build my mustang which is about that scale I'm gonna go the Turnigy Plush 80amp, 6S and prop to match, they're supposedly better than the HXT's or if you want to go bullet proof (And pay for it!!) Look up Castle Creations Speedies! They're what you'll find in Darren's big planes.

---

Re: Kev's Easy Sport 40 Build Thread. - robair - 25-06-2009

Gday Kieran

Great info from you as always, the Motor/ ESC/ Battery / Prop combo chioce confuses the crap out of me, I also noted interesting points from the colour scheme link, great to know that my yellow mega cub will disappear in the morning sun.

---

Re: Kev's Easy Sport 40 Build Thread. - kizza42 - 25-06-2009

Any plane will disappear in the sun!
Everything will disappear somewhere:
Blue in the sky...
Green in the ground clutter...
In my opinion, Red or Yellow with contrast is the best choice and I think that the size of that Cub is going to make it hard to lose! I've had the Stryker 1km out over at Blacktown and its still with me If you've gone that far you're being naughty :P

---

Re: Kev's Easy Sport 40 Build Thread. - ~KevJ~ - 25-06-2009

Quote:great to know that my yellow mega cub will disappear in the morning sun

comforting indeed..

Quote:I'm gonna go the Turnigy Plush 80amp, 6S and prop to match,

ive read up on that plush 80A and it sounds like a goer.. so thats a turnigy 42/60 500kv, turnigy plush 80A esc and a spectrum DX6i confirmed equipment.

now to choose some batteries , a good prop to start with and need to choose some servos as well.

any suggestions on some "afordable" servos that would be suitable?

also wondering if anyone has experience with the SK range of turnigy motors and what the difference is compared to the standard, the particular SK i was looking at is cheaper than the non SK yet i thought they are the "better" ones?

---

Re: Kev's Easy Sport 40 Build Thread. - chrism - 25-06-2009

Hey Kev,
I see that you are looking at Turnigy TR 42-60C 500Kv motor. From my limited understanding you need to settle on a prop size when choosing a motor, as the lower the Kv rating the larger the prop diameter diameter needs to be. You have indicated that you are looking at a 15x10 or 14x8 prop, these are quite large in diameter considering the model that you are fitting it to - will it hit the ground or cut the grass when the strip has not been mown for a while.
I have seen some reviews of a Great Planes Easy Sport 40 (I am guessing that this is your plane) and they have used a 12x8 prop.

Me, I use the following on my Phoenix Classic EP trainer (wingspan 1420mm, weight approx 2kg)
Motor - Himark 3526 830Kv
ESC - Conquest SJ 45Amp
Battery - 3S 3200mA 20C & 3S 3200mA 25-30C (can use a 4S 4000mA)
Prop - 11x8.5 now & originally 10x7

With the original prop and 20C battery the plane only just got of the ground but once airborne it was fine, changing to the 11x8.5 prop made a world of difference as the coarser pitch used the slower revs (3S battery compared to a 4S) and torque of the motor effectively. Then when I use the 25-30C battery taking off was never going to be a problem as the battery could deliver the required current.

I suppose what I am saying get your entire package sorted before making your purchase.
I hope this helps a little.

Chris M

---

Re: Kev's Easy Sport 40 Build Thread. - kizza42 - 26-06-2009

I think you're worried about putting a .35 spec'd motor on a .60 plane?

Keep in mind that when they give those equivalents that they are only approximate and also account that they usually match to "Sport" IC powered systems which is supposed to be more than enough power for anyone short of full 3d work.

I think anything larger than a .35 is going to be fine for your bird. going to a .46 or .60 equivalent will give stacks of headroom (And Vertical )

Your greatest challenge will be landing on the East-West runway with all of that inertia although there is nothing stopping you approaching easily from the other direction.

---

Re: Kev's Easy Sport 40 Build Thread. - ~KevJ~ - 26-06-2009

hey thanks for the great info kiz and chris , you are definately right about the prop, im not ready to buy for another month anyway , im just trying to plan so that i have it worked out and although im a noob im backing myself to pick it up "fairly quickly" and i really want to have the ability to climb vertically easily... perhaps im asking too much im not sure but im still working it out, perhaps ill look back at the motor choice with the smaller prop in mind..

---

Re: Kev's Easy Sport 40 Build Thread. - ~KevJ~ - 02-07-2009

I found some info that is really helping me get my head around the concepts of motor choice for my bird so rather than having to stuff around trying to find it again im going to post it up here to keep it central for myself and anyone else who may come along and is new to EP models..

Quote:Yes, you're on the right track. The motor is ratred with a Kv number. That represents the RPM per Volt it will turn. Batteries (Lipo) are rated by the number of cells (3.7 volts per cell) and the capacity in mAH (miiliamp hours). So, a 5S is 5 cells in series, and 2P means two parallel cell packs of 5 cells. So, in this case 5S is 5 x 3.7 = 18.5 volts, and 8000 mAH is two 5 cell 4000 mAH packs wired parallel.

Then, 18.5 Volts x 510 rpm/volt = 9435 rpm (no-load). The reality is a fresh battery with proper nominal propeller selection to load the prop to generate the thrust will draw that rpm down consideraby. We should target the optimum rpm for a given sport propeller around 11,000 rpm to get best results. So, you can see that the 5S pack is turning too slow, and therefore to compensate you have to put a much larger diameter prop. Hence, I had to put on a 15" prop to get the thrust up high enough and load up the motor.

On electrics, you select a power range for a given flying style, in this case a trainer is simple pattern flight. You need about 50 watts per pound minimum for a trainer with simple pattern flying. For an acrobatic plane, you need 100 W/lbs min., and for 3D stunt flight you need 150 W/lb min.

That wattage range then dictates the equipment selection. So, for a 8 lb plane we shoot high at 100 Watts per lb, and need 800 watts (final thrust power). You then divide by the prop/motor efficiency, typically 75-80%, and estimate you should draw around 1050 watts (800 watts / 0.75). That's all ballpark, but you get the idea. Now you go pick out a motor that makes that kind of power, and then match up a battery and ESC that will support it.

Here are some pict's of the install. We fabricated a block to push the outrunner reversing kit out to get the prop to the right position, and this method maintains the proper thrust angles. It's basically two layers of 1/2" balsa, sandwiched in 1/8" ply. There are 4 long screws that go thru into the origonal motor mount blind screw, then 4 blind nuts in the back of the block that the Outrunner backplate mounts to with long screws. It's a bit of fabrication, but if you're good with tools it's not too bad.

The battery is just in the bottom of the plane up front on a pad of foam with a velcro strap. It's not all that hard.

---

Re: Kev's Easy Sport 40 Build Thread. - ~KevJ~ - 06-07-2009

thought id throw up a couple more pics of the recent work to the fueselage..

new lounge came the other day so i got kicked out of the house back to the garage..




She's coming together nicely ,but ive just had to hold up abit as i need the bolt pattern of the engine mount to predrill the firewall b4 i epoxy that area,going to see if i can get the dimensions from the hobbyking web site now, i need to get things sorted and get my membership fixed up and put an order in but at this stage im looking at a 42/40 on 5s,80a esc (to be safe,dont think ill exceed 60amp) with a 12x8..im getting my dx6i from col taylor in wagga this week, will aim to get a more accurate total weight b4 i make final motor choice (i ended up selling my 1/8th nitro car and am downsizing to a 1/18th team associated brushless, that way i still get my car fix but combine the two hobbies by keeping everything electric, plan on getting the 30cm car doing 150+ kph but thats for another forum.. )

---

Re: Kev's Easy Sport 40 Build Thread. - ~KevJ~ - 10-07-2009

Ok ive nutted out what i think will provide enough power for my balsa tank
my biggest concern is the fact that they are out of stock on the motor and esc i want .. anyone know what sort of time it takes for hobbyking to restock in these situations..?


i plan on running the 3s in series to pump volts into the 42-50(im just hoping the run times are longer than 4 minutes :? )
i plan to wack on the 12x6 (fingers crossed)
reason im wanting to keep it to the 3s packs is because ive got my eyes set on the parkzone f4u corsair come birthday in two months .. (hint hint any family members who happen to read this and might be talking to my wife...PNP version.. $249 modelflight.com.au.. )
anyways there it is i guess , will be ordering all this next week along with my DX6i.. by by rc cars hello rc planes...


Quantity Stock Product description Price Weight
353 SC-FWM-2530 - HXT Alloy Composite Firewall Mount (85/36mm) $4.80 69g

-4 SK4250-650 - TGY AerodriveXp SK Series 42-50 650Kv / 1150w $25.95 250g

4095 HX5010 - HXT 6.9kg / 39.2g / .16sec Twin bearing servo $23.80 196g

-18 TR_P80A - TURNIGY Plush 80A w/ UBEC Speed Controller $54.54 120g

6276 Z22003S20C - ZIPPY Flightmax 2200mAh 3S1P 20C $67.96 788g

37 Accucel8150 - Turnigy Accucel-8 150W 7A Balancer/Charger $69.95 990g

1568 APC11x5.5-E - APC style propeller 11x5.5-E $1.50 35g

809 APC12x6-E - APC style propeller 12x6-E $1.30 65g

710 APC14x7-E - APC style propeller 14x7-E $1.50 65g

Total: $251.30 2578g

---

Re: Kev's Easy Sport 40 Build Thread. - paulj - 10-07-2009

Hello all,
From sunny Brisbane.
If you had the weather I've had all week up here the field would be nice and dry.
Kev, you should check with Kieran to see when he might be placing another order
with Hobby City. You may find that he can get some of your things a little cheaper and you also may be able to share
the postal charges.
If not, then you have lost nothing.
Glad to see that you were able to sell all your car gear for a good price and welcome to the world of
rc planes.
I'll be back in Sydney late Monday night hope to see you all next weekend
weather permitting.

Paul

---

Re: Kev's Easy Sport 40 Build Thread. - ~KevJ~ - 10-07-2009

i need to get down to the shop tommorow and see if i caan find appropriate motor mount to drill bulkhead b4 i epoxy the firewall so i cant progress with plane till after that , but just for kicks i wanted to do a mock up of the plane so far.. starting to get real excited about getting it airbourne...!!

---

Re: Kev's Easy Sport 40 Build Thread. - ~KevJ~ - 11-07-2009

well i sold all my rc car gear to finance my airforce but i couldnt help but to get a little something to satisfy my car itch on those days i cant fly , it might look small but when im finished believe it or not it will do 100 k's an hour

---

Re: Kev's Easy Sport 40 Build Thread. - paulj - 11-07-2009

Little Rippa.............
Bet you and Ryan will have a lot of fun with that.
Your EasySport looks good mate you are doing a great job for someone who
has never built models before.

Dad

---

Re: Kev's Easy Sport 40 Build Thread. - ~KevJ~ - 28-07-2009

:ugeek:

just a couple of update pics, things slowed while i was waiting for some parts but got what i need now so its moving forward again..

[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/P7230175.jpg[/autoimg]

[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/P7230176.jpg[/autoimg]

[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/P7230177.jpg[/autoimg]

[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/P7250179.jpg[/autoimg]

---

Re: Kev's Easy Sport 40 Build Thread. - ~KevJ~ - 06-08-2009

well some of you told me to put the wheel in front of the firewall and it was good advice but through some mistakes i made with the motor mount and the fact that i cant get it out ,[ is too wide now that firewall is epoxied (screws are recessed into fuse sides..)]and the fact that i can no longer create an access hole for the steer gear linkage. i have had to go with what option i had left and that was to relocate off the back of the firewall.. all is lining up nicely doing it this way and fingers crossed that i can brace the back of the firewall enough to absorb the shock of the landings ... seriously with the weight this plane is producing im sorta leaning towards calling this a lesson in building for me anyway as im really eyeing of a seagulls models PC9 to transfer all the gear out of this to at XMAS time...

anyways it is what it is and ill post a little progress, i have next week off after snow as well so im hoping to get a heap done then also, i want to at least see what happens when i fire 6s (22.2volts) into my turnigy 35-48- 1100kv with 12x8 on it... just to see what happens perhaps the greatest lawn dart ever seen down at the P.R.A.C ... or perhaps even more trouble than dads head hunting glider

[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/DSC01758.jpg[/autoimg]
[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/DSC01759.jpg[/autoimg]
[autoimg]http://i402.photobucket.com/albums/pp103/fuzzymmyf/DSC01760.jpg[/autoimg]

---