Dolly Launcher for Ripmax " Mustang "

Alternatively Colin install retracts like the ripmax mustang I have ....

I must point out previous owner did this not me, I’m not sure I could have bothered to do it, but they are great

Tuesday 25th June - Light wind down the runway so first trials of the dolly were " up hill "
So here we go for the models maiden flight - built up speed gradually tracking slightly left, onto 3/4 throttle still not unstuck, touch of up elevator and she jumps off the dolly.
A few trim inputs and she's flying rock steady, landing no problem, slight touch of up elevator and she touches down on the radiator intake with no damage to the fixed prop.
Second flight could not control left swing with the rudder and again jumps off the dolly when up elevator applied, no action shots since I was the only one there.
I was hoping that when she reached takeoff speed she would have just lifted off the dolly without elevator input.
The " jump off " is very sudden - any ideas how to achieve a gentle lift off would be appreciated.
I'm considering fitting a steerable wheel to overcome the left swing.
Thanks
Colin.

I would suggest that you increase the angle of attack on the dolly Colin, it's probably jumping because you're applying lots of elevator to get it unstuck, then when the speed is enough it jumps off

Slight toe in of the main wheels might help keep the dolly straight.

Pleased to report additional modifications, toe-in, increased angle of attack & addition of wing stabiliser,
have resulted in success.
With the model on the runway & standing in the pilots box you can judge the speed better & lift off the
dolly is much smoother.
When applying rudder the wing stabiliser prevents the model " rolling " in the dolly.
Thanks to Jon & Brian for their suggestions.
Pic attached, dimensions included for information.

Colin.