Back Flip Gearing

[Waste Land]

Alright....I've been messing with backflips alot lately. I'm unsure of exactly how to set up. I have my suspension right and such but there is a question in my mind.

When backflips are performed the tires act as a gyro and make the truck perform the rotation.....so?

Is it the torque up to max rpm that drives the rotation
or
Is it the max RPM of the tires spinning causing more rotation

I'm on the fence on both ideas. It seems to be both but not really. Confusing.

I'm looking to regear my Mini T sometime soon. I'm running a 15t and it isnt keeping the front wheels down. I'm wondering if I could drop a few teeth on pinon and see some flips.

I posted this in General Nitro because its a lesson in RPM vs Tq on backflip, nothign to do with electric motors or 1/18th scale...that was just my example.

 

[supercharged]

it think its the torque

and wouldn't it be better for more teeth on the pinion for a higher speed at half throttle because the unloaded wheels will still hit max rpm quite quick even with a higher gearing when you hit full throttle

 

[redhatman]

Its the torque. Thats why when I want to do a backflip I go off the jump about 1/3 to half throttle and then once your in the air, go WOT. The more dramatic throttle curve the faster you will flip.

 

[Waste Land]

Its the torque. Thats why when I want to do a backflip I go off the jump about 1/3 to half throttle and then once your in the air, go WOT. The more dramatic throttle curve the faster you will flip.

Spiffy...

 

[olds97_lss]

Yep. If your running full tilt when you hit the ramp, you don't get much rotation. Especially with a vehicle that is geared to where the engine is really hitting max RPM's with the tires on the ground.

 

[NvNitro]

Haven't gotten that far yet but, when doing flips, Is it correct to say that before you land you need to be off throttle untill your down on the ground. Not full throttle when you hit the ground...I think that would tear somethings up under neath. Would I be correct in saying that!

 

[olds97_lss]

Yep, you'd be correct. If your going to try a lot of backflips, I'd back the slipper nut off 1/4 turn or so just to help you with drivetrain damage. You actually should be hitting the brake once the truck has made a 3/4 rotation to help slow the tires down before they make contact with the ground. You will almost always have the rear or front tires hitting the ground first. This means either the front or the end will be in the air still trying to spin when the other tires are doing an instant stop. Rarely will you get all 4 to hit the ground at the exact same time. That's a lot of mass and strain to put on your diffs and center axles.

 

[Waste Land]

Fast Revs + instant stop on land = drog bone shearing