build Mini Super Belair Kits

[PatMc]

It's not incidence that's causes the wing to create lift, it's the angle of attack. The angle of attack is dependant on the difference in incidence between wing & tailplane and the thrust angle and the cg. i.e the three angles and the cg position are inter-dependant.

Normally the thrust angle is at a fixed angle wrt the wing, the cg is also fixed laving the tailplane to trim the wing AofA via the elevators.  

If the model has a forward cg position it will require a greater AoA to fly straight and level at cruise power. It will be less sensitive to elevator control but more sensitive in pitch to variations in thrust. 

 

 

[EarlyBird]

Thanks Ron that's exactly what I want but in a more controlled way.

 

Thanks Pat I think I am beginning to understand. 

 

Steve

[Ron Gray]

8 hours ago, EarlyBird said:

Thanks Ron that's exactly what I want but in a more controlled wa

Yes, you certainly want it more controlled, when it happened to me I thought the radio (Tx/Rx) had developed a problem, hence the rapid landing choice.

[EarlyBird]

Packed the TE up by 2 mm and removed the down trim which improved the tendency to climb under throttle. I checked the glide angle with no power followed by a landing which resulted in a little bounce. Power landings although good are not easy due to the large effect of one click on the throttle stick has. Now I have a choice either to keep flying as it is and probably get used to it or change the prop for a 10x4. ? then I could pack the TE a bit more, say by 1 mm. I do like experimenting (playing) it's part of the fun to me. 

 

Steve

[Nick Cripps]

Just realised that I had one of these a few years ago. I picked it up at a swapmeet for £40 and it came complete with OS15, 3 servos but no receiver. It also had the TE packed up by a few mm to prevent excessive climb under power and was quite fun to fly, albeit somewhat limited in its capability.

I sold it off after a year or so to free up some space and recouped my original outlay.

[EarlyBird]

Bought a 9x4.5 prop to reduce power and climb rate. Test flight at half throttle needed elevator down trim but not excessive. Partially successful and what I expected, having done similar experiments with a Super 60. Increasing to full throttle did not cause a huge increase in speed, maybe lacks power. I have to decide what to try next my thoughts are to pack up the TE by another 2mm and maybe go back to the 10x5 prop. But there again, as I have said before, I could just fly as it is and get used to it.

 

Steve

[EarlyBird]

It's still flying better than ever I went back to the 10x5 prop and removed all the packing on the trailing edge, this made it land itself with only a couple of skips. To stop the ballooning up I increase the down thrust. It now flies in a controlled manner and has become a beauty. The addition of the ailerons has made it a aerobatic model, it will perform rolls and spins. It has become a joy to fly and my go-to model rivaling even The Ohmen.