29-10-2011, 07:44 PM
You are dead right there mate.
If the Skyfun does not generate enough speed off the ramp it could end in tears.
I run a 5x5 on my skyfun, the little sucker gose like stink but it is very slow off the mark.
On a different subject, I would appreciate your advice on a project I am just starting.
I am building a Skyfun twin rig (Yes mate thats right 2 engines)
I have emailed Peter Pine about prop recommendations and he has been very helpful.
I am going to modify the vertical stabilisers to give prop clearance and mount the motors on a carbon fibre plate just inside both fins and am covering the whole airframe if ultra light glass with Cabots urathane. I will of course be replacing the Elevons with stifferned balsa units and adding an extra 2 x4mm carbon fibre spars to the airframe.
I will be running twin Scorpion 2221-8's on 4S. I wanted to run counter rotating props but there is nothing available.
I think twin Graupner 6x5 will be the goods, Im not sure on the maths but with 2 of the suckers the load on the motors should be reduced considerably at higher RPM.
Peter Pine assures me there are a number of similar twin rigs around that run both props spinning in the same rotation and recons torque roll wont be a problem.
Interested in your thoughts and would appreciate your input on my 300kph+ project.
Gazz
If the Skyfun does not generate enough speed off the ramp it could end in tears.
I run a 5x5 on my skyfun, the little sucker gose like stink but it is very slow off the mark.
On a different subject, I would appreciate your advice on a project I am just starting.
I am building a Skyfun twin rig (Yes mate thats right 2 engines)
I have emailed Peter Pine about prop recommendations and he has been very helpful.
I am going to modify the vertical stabilisers to give prop clearance and mount the motors on a carbon fibre plate just inside both fins and am covering the whole airframe if ultra light glass with Cabots urathane. I will of course be replacing the Elevons with stifferned balsa units and adding an extra 2 x4mm carbon fibre spars to the airframe.
I will be running twin Scorpion 2221-8's on 4S. I wanted to run counter rotating props but there is nothing available.
I think twin Graupner 6x5 will be the goods, Im not sure on the maths but with 2 of the suckers the load on the motors should be reduced considerably at higher RPM.
Peter Pine assures me there are a number of similar twin rigs around that run both props spinning in the same rotation and recons torque roll wont be a problem.
Interested in your thoughts and would appreciate your input on my 300kph+ project.
Gazz
Parkzone Stryker 27 Evolution
E flite Ultra Stick , T 28 Carbon Z
Skyartec Skyfun Scorpion,Skyfun 90 EDF
Hobbyking Voltigeur, Funfighter T28, Mirage 2000, Minimoa 2.4m Glider
Jet Teng L-39 HPAT Stumax 90
Pheonix Tiger 50
FliteWork Extra 300 LPX 2.6M
Spectrum DX9i , DX6
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