A year or two ago someone, I think it was Igor did a thread on a Fancyfoam Yak 3D rc plane converted to indoor electric. I am just finishing one and need some input on the leadout guide. If anyone knows the link to the thread could you post it. Also wanted to know what prop you were using. My guess from motor size and amps that I have read about this year it was about 10X4.7 inch slow flier. What rpms were you flying?

My primary question is the leadout guide is causing an aileron deflection downwards due to gravity. Did you put a carbon fiber rectangular strip along your trailing edge to minimize this or just fly with it and let it help lift the lines. Inverted gravity will pull it the other way and overhead it will go neutral. Doesn't sound like a good system to me but considering it made me pause before I did the carbon fiber and ask what you did.

bob branch
planning first flight on Monday. 
 

Igor

Ah, now I see what you did. I put too much stucture out there. The Fancyfoam Yak (Gernot Bruckman's plane) has much larger ailerons I locked them with some tiny foam tabs and have my leadout guide mounted on the outboard end of the ailerons. But I have enough weight in them that the  thin depron flexes downward at the outboard end. Obviously looking at what you are doing I have too much structure so I'll get rid of it and solve the entire issue.

bob branch
Harsens Island, Michigan

more photos

control system layout
leadout guides -1/64 ply doublers, delron guide from tuned pipe hanger attached with tapped 4X40 bolt - adjustable via different holes
bellcrank - 1/32 ply doublers, sig 2 1/2 bellcrank with 4 inch 1/32 ply overlay. Carbon fiber pushrod

Now I understand, LO guide is on "movable" part of the wing, I would try to glue it by CA glue to the wing ... but you know what to do :-)

I need ~550mah from 800mah battery for full program and it takes ~ 4:40min

Igor is the man when it comes to indoor CL, at least on this forum.

You might try searching on Igor's name and "indoor" from the forum main page -- something like 'Igor Burger indoor' should cough up a whole bunch of threads.

Vince

The fancy foam yak suffered from too much wing flex. I converted it to rc where it is wonderful as is well known. I also built one of Igor's models and flew it indoors. Controls came out way too fast but I only got to fly it a few times last year. Our club does not start flying indoors til just after the first of the year when I'm planning on going back to it and slowing down the control system. The layout of the supports under his wing gives it a lot more stability as does the lack of flaps. The wing area of his planes are larger than the fancy foam yak plus the underwing support system really adds a considerable amount of area as well so the wing loading goes down and of course that drops the required airs peeds. I have no paved area to fly on during the summer season and it would require paved surface and absolute zero winds. I live on an island where several rivers come into a large lake. It is rarely zero wind here, almost none at all this year. I would really like to see more folks flying indoors around here. The gym we fly at was remodeled during the summer. Hopefully we will get some of the ceiling obstructions gone. Still waiting to see.

Igor, what weight motor in grams and what kv are you running?

bob branch

Bob, I use special motor made here close to us, it is 1400rpm/V, but important is internal resistance, it is only 150mohm ... that large 10" prop loads it lot, so the resistance is very important thing. It is 32g heavy with back support and prop driver (2 screws directly in the body). I you will choose from cheaper chinese production, you will end up little heavier, but several guys here used Emax CF2822 with success, but its weight is 45g in the same configuration. So that is why that my model has little more area than ususal F3A indoor.

TO RPM is 4500 so that is the power which the motor must deliver on ground. I use 800mah battery and I need ~550mah for 5 minute long flight. Lap time on 5m long lines is 4.9 - 5 s

I think landing on grass is not big problem, when motor stops, model stalls anyway, and it falls like a piece of paper if you do not whip it little bit :- )))

here you can see my prototype .. it did not have any wheels, motor is strong enough to take it up, and landing was rather falling than gliging 

just be carefull, if will not start easy from conrete, it will tend to flip to nose because of friction, but you can start from hand ... starteng from floor in gym is not big problem