Hi,

I have a Venus with an OS 61 FX in it, and she has never tip stalled at all, even on landing.

Some thoughts:-

Are you sure your CG is in the correct place? Tip stalls are normally caused by the weight being too far back, but can occur when it's too far forward too.

The most common cause of snapping (which is similar to a tip stall) is too much elevator movement.

Also, it might be worth checking to see if the two halves of the elevator move the same distance throughout their travel. Tape two long pieces of balsa stick to the elevator halves, sticking backwards and touching each other then move the elevators. The sticks should stay together.

Also, it's worth checking the lateral balance.

My Venus is about the only plane I've got that doesn't tip stall!

-David C.