transmission problem

[babi_hrse]

i have searched the forums and could not come up with anything
my problem has me truly stumped
any advice welcome

i have a hpi rs4 nitro car. it has a 2 speed transmission. 2 spur gears and 2 pinion gears.
the engine is also fixed to the chassis without the aid of a engine mount and it has non adjustable holes so adjusting engine position is not possible.
recently I've changed a clutch and a shredded spur gear as the batteries went dead and the car full throttled into a kerb and ate both.
now I've since replaced both and I've ran the paper through the teeth mesh between the spur and the pinion gears lovely mesh
now I've taken my car out to run it and it goes about 6 feet then conks out and i can hear a rapid whirr slowing down quickly. at first i though it was a broken clutch shoe spinning around the cluchbell when it stops moving. <it wasn't that>
then i though it was a loose dogbone shaft <it wasn't that> now i look at it again and the spur and pinion gears are seperated again i can turn the pinion gear around without the teeth meshing. the second gear does mesh however that only engages at high rpm so for the moment thats whats making the powering down whirr as it decellerates.
does anyone have any idea why the 2 seem to have seperated and how to fix this or problem areas to look? to the best of my knowledge the chassis isnt warped and the engine is threadlocked down just seems like the 2 don't want to get along together?

 

[babi_hrse]

it was the chassis after all. the part where the engine was mounted was bent upwards. my guess is in the crash when the engine didnt conk out and kept piledriving into the kerb it pushed with all of its 2hp strength itself away from the spur gear and bent the chassis beneath the engine block. I've straightened it out and it has fixed the issue. next purchase will be a graphite upper deck to prevent this from happening again.

---------- Post added at 7:56 PM ---------- Previous post was at 7:55 PM ----------

can we lock the thread please

 

[Metalhead Matt]

You need a 6 volt rechargable rx pack and failsafe to keep runaways from happening.

 

[Snook Man]

+1 on the failsafe and a throttle return spring…

The engine did not bend the chassis out of raw horsepower; the engine bent the chassis due to the sudden impact and the momentum of the engine weight continuing forward.