I recently built the FT Simple Cub and painted it. I tried taking it off and it seems that the B Motor, battery, or propeller (don't know which) is causing the airplane to not be able to take off. At first I tried to take it off, and it drove on the ground, but didn't takeoff. Then I tried to hand launch it, and it did just a straight nose dive in the ground. The propeller broke, so I replaced it. Had the same problem the next day with it not being able to takeoff. Any suggestions? Should I change to a C Pack? Bigger battery? Bigger propeller? All of the above? Anything will help!
Help! Simple Cub Takeoff/Power Problem
- Thread starter Crutchy
- Start date
Matthewdupreez
Legendary member
Check that your control surfaces are traveling the right way... When you pull down on the elevator stick the control surface should move up.
The control surfaces are fine. I don't have as much left rudder as I would like, and i will probably have to replace the push rod for that (I'm getting a little bit of flex). I think that the plane is actually slightly tail heavy. I tried to balance it a couple days ago, and it wouldn't even move, so I tried to just fly it without the weights, and it wouldn't takeoff. It might seem like an obvious solution, but I'm sort of new to this hobby and I'm not sure what to do.
Matthewdupreez
Legendary member
Could you post a video of how it balances?
Here is how it balances. I thought it was more tail heavy, but I actually think it's right on level with may a hint on nose heavy: https://youtube.com/shorts/RVmIQ60NneQ?feature=share
Here is how much elevator deflection I have:
Here is how much elevator deflection I have:
Tench745
Master member
A little hard to tell from the video, are your fingers on the CG marks from the plans? Your plane is balancing a little tail low in the video.
Another thing to check is that your prop is on the correct direction, and the motor is spinning the right way. The numbers on the prop should face forward, and obviously, it should be blowing air back over the plane.
Another thing to check is that your prop is on the correct direction, and the motor is spinning the right way. The numbers on the prop should face forward, and obviously, it should be blowing air back over the plane.
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Matthewdupreez
Legendary member
Are you applying full up elevator when you throw it or takeoff??
If so you could be stalling the plane, I do think you've got wayyyy to much up elevator throw.,.
I would adjust your throws if you can... Use the throw gauge that's included in the kit... And use low throws
Matthewdupreez
Legendary member
You could possibly also have down thrust on your motor by accident...
That could cause it to not takeoff.....
Because the prop+motor is pulling the nose down...
If you look at the motor, it should be perfectly parallel to the wing, if not you've got a problem.
That could cause it to not takeoff.....
Because the prop+motor is pulling the nose down...
If you look at the motor, it should be perfectly parallel to the wing, if not you've got a problem.
Matthewdupreez
Legendary member
Try trying to take it off and record a video of it, then post it here..
Matthewdupreez
Legendary member
No not on a b power pack...
Try ordering from a different store, and if you want one that'll last just about forever get an APC. I've crashed mine really hard five times and it's still perfect
10” prop is totally fine on a B pack. I’ve done it many times and the motor doesn’t Have any problem with it.
Matthewdupreez
Legendary member
Oh... Ok ..
I didn't realise that it could work...
