6 replies to this topic

[BigDog]

DUPR rules at Steve's site said:

"... 1.2.11.3 Metal rod bracing may be used between the rear of the motor and the rear axle/chassis on one piece (GROUP 1 – see below) chassis ONLY. ..."

Sorry for being blunt, but reading the 09 DUPR rules I found myself wondering which side is the "rear" of the motor: would it be the opposite side where the pinion is, or not?

The remaining items are very clear: congrats to those who wrote them up.

Hope to have an entry in next year's DUPR!

Cheerio lads!
BigDog

[chenglaw]

That would be the side of the motor facing (nearest) the rear axle in the case of a sidewinder or anglewinder mounted motor. In the case of an inline mounted rear-driven motor, it would be the end from which the pinion gear drives the rear axle crown gear.

[aastes]

chenglaw, on Apr 2 2009, 04:49 AM, said:

That would be the side of the motor facing (nearest) the rear axle in the case of a sidewinder or anglewinder mounted motor. In the case of an inline mounted rear-driven motor, it would be the end from which the pinion gear drives the rear axle crown gear.

correct - its from the rear of the motor backwards no matter what angle the motor is located within the chassis



bracing location in red

[rick1776]

Nice picture aastes. Very clear and informative.

[BigDog]

rick1776, on Apr 1 2009, 08:33 PM, said:

Nice picture aastes. Very clear and informative.

Thank you both, chenglaw and aastes,

Now I fully understand what that rule means. Must say that the diagrams helped a lot!
Now to the second part of my investigation: do most of you guys in the DUPR reinforce your chassis' this way...?

Cheerio lads!
BigDog

Edited by BigDog, 02 April 2009 - 10:17 AM.

[aastes]

BigDog, on Apr 2 2009, 11:16 AM, said:

rick1776, on Apr 1 2009, 08:33 PM, said:

Nice picture aastes. Very clear and informative.

Thank you both, chenglaw and aastes,

Now I fully understand what that rule means. Must say that the diagrams helped a lot!
Now to the second pat of my investigation: do most of you reinforce your chassis' this way...?

Cheerio lads!
BigDog

There is the well known problem of the 'Ninco Hop'. When running no mag downforce Nincos hop under hard accelaration. Just a simple bracing ( I actually just use paperclip type wire) which forms a sort of box section and the hop goes away. Power gets put down smoother and gears dont get crunched. No much of a problem with sidewinders (which Ninco dont make) but can be bad with anglewinders

[chenglaw]

Yup, I braced my Ninco Mosler with a piece of pcb epoxied to the chassis even though I didn't experience any "hop" with the car - you can never be too careful! And in any case, it added weight to where I needed it.