Large Model Association Forum

I bought this model a while ago, but as yet, have not around to it, i doubt the aileron servos, nothing wrong wth them, but they are only futaba 3001s, 2 of them in the bottom wing, linked to the top ailerons, the other servos are great, being futaba 1/4scale ones, but are these 2 enough to drive the ailerons on a big aerobatic bipe? they would be a devil to get out, for one thing, there is no spare wire to solder too, this is the only thing stopping me flying it, any views? power will be a zenoah 62, and if thats not enough, a 74 twin,

Alan

Back in the days when the model was designed (late 1970's) servos as powerful as a 3001 were a luxury. I flew the original with Dunham D8 servos which were rated at about 4kg so the 3001's will be ok as long as you fly it in a scale manner.

This is really the issue here. The full size Jungmeister did not fly like a Pitts Special. It only had a climb rate of about 800ft/min which is not much better than a Piper Cub. Aerobatics were always started from some height and the plane slowly descended through each manoeuvre. Most of the models from my plan that I have seen are well overpowered and are flown in anything but a scale manner. If you want to fly it like a Pitts then you may struggle for servo power at excessive deflection but if the ailerons are scale and built to the plan with the correct shape leading edge and if the model is flown in a scale manner then 3001's will be fine.
Fitting some hi power digital servos is more of a fashion statement than a necessity.

John

Just the person i wanted to reply to the question, thanks John, slow, lazt aerobatics are what i like, the control surfaces are all scale hinged, as per the plan, i will get her going, and see what its like, i have doubts about the 62 being man enough, but will give it a try, looking forward to it

Hi Alan, John,
I build a Jungmeister from the John Greenfield plan just 2 years ago. What a superb flyer it is.
I can testify that you do not need a high power engine. Mine was originally powered by a Zenoah 45 with standard low end Muliplex servos. A Perfect match in my eyes for Scale flying. Unfortunately my Zenoah went back into my Cap 21 (Toni Clark) so I went for the 3W-55xi, there is a difference of course
Paul

Alan

The 62 will have more than enough power for scale aerobatics. The original flew on an Evra 32. Anyone been round long enought to remember them !!?

John

Hi Alan, I also have one of these models which I have owned for over ten years but have never got round to flying it either, as I stripped the tatty covering off the fuselage and that's as far as it's got (you know how it is!) Before I bought it, it was well flown, and has only got basic Futaba servos in it, which i must admit was a surprise to me at the time. The engine in mine is a King 70, a big hefty old lump compared to todays modern lightweight stuff but probably well matched to the airframe to give the required C of G, here is a photo of her in her prime.

Thank you gentlemen, this lovely lady is going to get some airtime, soon as summer starts thanks for the reassurances about the servos, and engine, VINCE, get it finished

Alan,I hope that I have not taken over your post,but John,not only do I remember the Evra,I still have one.It powered my 1/2size Comper Swift,which had a rather pedestrian climb out.

Barrie B