Kev's Easy Sport 40 Re-Build Thread - Printable Version
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+--- Thread: Kev's Easy Sport 40 Re-Build Thread (/showthread.php?tid=29)
Kev's Easy Sport 40 Re-Build Thread - robair - 13-02-2010
Gday All
Thanks to Kev he has kindly donated the Easy Sport 40 (hereon ES40) to myself as an experimental test bed in regards to build and design techniques.
There are a few things we know about the ES40:
1- It is a great design.
2- Kev did an awesome job of building her.
3- Its flight stability looked very good
4- I weighs a ton or two.
5- Sucked an enormous amount of amps.
Due to the above I had a few options mentally floating around, all involved reducing the weight substantially and removing the need for the massive amount of added noseweight to balance. Ideally I wanted have swags of lift and a fairly low stall speed.
The photo below indicates the direction I have chosen. I had cut out a couple of foam core wings a few months ago to teach myself the technique and also to have a shot at skinning, the wing was destined for the Precedent Hi Boy, as you can see I have found another use for it.
So, the ES40 is going to become a biplane and I am just about to drill out about 40 zillion holes in the structure to drop the weight. Am also toying with the idea of making her a twin with the nacelles mounted midspan inter wing.
Thanks for the opportunity Kev, much appreciated. Look forward to you having a flight when she is done and dusted.
Re: Kev's Easy Sport 40 Re-Build Thread - paulj - 13-02-2010
Seeing as I first bought the kit almost 12 years ago I shall be watching this
thread with great interest.
You certainly think "outside the square" Rob.
Good luck, can't wait to see finished article.
Paul
Re: Kev's Easy Sport 40 Re-Build Thread - robair - 13-02-2010
Gday Paul
Thanks for dropping her off, it is going to be an interesting journey with this one.
FYI I have been busily drilling and have already knocked off almost a kilo from the fuselage all aft of the wing.
Lookin' good so far!
Cheers
Rob Byrnes
Re: Kev's Easy Sport 40 Re-Build Thread - kizza42 - 13-02-2010
I dub thee "Flying Swiss Cheese!" Great work on the weight removal Rob, I reckon go 4 small engines and make it a scale Handley Page H.P 42 "Flying banana"
Re: Kev's Easy Sport 40 Re-Build Thread - robair - 13-02-2010
Welcome to weight reduction 101. We indeed have Swiss Cheese. As Kev built her like a brick outhouse there has been no reduction in strength or rigidity with all the removed material. Goes to show a great, albeit overengineered design.
1.7 kilos dropped and still aft of the wing, havn't even tidied up the holes yet!
Re: Kev's Easy Sport 40 Re-Build Thread - ~KevJ~ - 13-02-2010
ROFLMAO!!!
awesome work rob, i cant wait to see it fly again..
you are right it was built strong , could tell by the way it chewed up the impact and spat it out with very little damage! i reckon there is about 1/2 kilo of epoxy!
i can tell you it flew like a school bus before.. steady as to get the kids to school not my thing but im sure with your big improvements it will be a heap of fun..
i cant believe your gonna add a wing and maybe two motors .. like i said awesome :!:
Re: Kev's Easy Sport 40 Re-Build Thread - ~KevJ~ - 13-02-2010
oh also i forgot to mention....
your nuts!
Re: Kev's Easy Sport 40 Re-Build Thread - ~KevJ~ - 14-02-2010
im hard at work on my easy sport replacement..
Re: Kev's Easy Sport 40 Re-Build Thread - robair - 14-02-2010
Gday Kev
She looks like a highly aerobatic machine, good stuff. I got massively bogged last night working out the wing positions for the ES40 biplane conversion. I had forgotten just how "dry" the findings of Betz Fuchs and Hopf were, however they wrote the book on effective biplanes way back in 1914. Their various equations still stand and are extremely useful.However doing the number crunching has temporarily broken my brain. So I am tweaking up my new glider for some mental relief.
Very sick of this weather, if I do not get a fly in soon I am going to go insane.
Cheers
Rob Byrnes
Re: Kev's Easy Sport 40 Re-Build Thread - robair - 17-02-2010
Gday All
Wing angles and offsets all calculated, cabane almost 100% installed, dry fit up shown below.
Re: Kev's Easy Sport 40 Re-Build Thread - kizza42 - 19-02-2010
Looking good! Another vote for a semi scale H.P 42!
Re: Kev's Easy Sport 40 Re-Build Thread - ~KevJ~ - 19-02-2010
lol your nutz!
but i think thats cool man..
i cant wait to see this monster fly!
Re: Kev's Easy Sport 40 Re-Build Thread - kizza42 - 25-02-2010
How about of few of these to power the ol' gal!
http://www.hobbyking.com/hobbyking/stor ... duct=11028
Re: Kev's Easy Sport 40 Re-Build Thread - kizza42 - 25-02-2010
Scratch that, you need the 9cylinder version!
http://www.hobbyking.com/hobbyking/stor ... duct=11029
Re: Kev's Easy Sport 40 Re-Build Thread - robair - 30-04-2010
Gday All
Here's a quick fleet update:
1.64m EP Glider (now 50% Zap-A-Gap) -- Rippin along happily with an improved motor that came out of Kieran's old MX. Top fun to fly!
GWS P40 Warhawk -- It's a GWS therefore it is currently awaiting repair, need to pop a motor in and she's "good" to go. In no rush whatsoever to do this. :|
F-27 (Ted) Stryker -- Mwwhhaahahahaha, undergoing some tweaks at the moment,
:ugeek: Hobbico Twinstar -- Needs a couple of motors, esc's and batteries, these will be ordered soon, I hope to have her in the air net in June where she will be a test bed for the motor/ esc/ battery combo I will then use in the Easy Sport bipe. :idea:
Easy Sport 40 Bipe -- Still a way to go, am working on it slowly due to the fact the Twinstar needs to fly before it will.
Thunder Tiger Piper J3 Cub -- She's big and yellow and I need to fly her more, all smiles from me
Hobby Zone Super Cub -- I need to hack out a space for the battery and she is ready to roll, not sure why I do not have this done as yet
ops: ST Cessna (The Antichrist) --Victor hated it, I enjoyed flying it then stacked it. Then the bloody thing took a bite out of my hand afters repairs! More than likely to become the airborne equivalent of a punching bag :x
Thunder Tiger Soaring Star -- Ready to go, will make an appearance soon
Walkera ? Helicopter -- Helicopters fly because they are so ugly the earth is repelled, nah seriously, dusted this off a while back had a bit of a fly, stacked her. Now needs new rotor head, may get around to this eventually
JR X2610 36mhz / Spektrum DX7