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Home > Cars > HotRod 4WD

HotRod 4WD

December 23rd, 2008 Leave a comment Go to comments

First attempt to build a HotRod and make use of the 8880 set suspension parts.

Datasheet:

Completion date: 22/05/2007
Power: electric (wire-controlled) / pneumatic (fed from internal manual pump)
Dimensions: unknown
Weight: 1.55 kg
Suspension: full independent with shock absorbers
Motors: 1 x RC, 1 x 2838
Pneumatics: 1 circuit with an airtank

My first attempt to redesign the suspension of the 8880 set. I have improved the suspension travel distance, steering lock, and mounted the shock absorbers in such a way, that they could be easily set at a different angle or replaced with absorbers of the same type but different hardness. The car is fitted with 4 wheels drive (quite unusual for HotRods), 2-speed manual gearbox (using a transmission driving ring)  and a V12 piston engine. Very unique feature is a pneumatic brake, using a large manual pump, a valve, an airtank and a small pneumatic cylinder. The pump is mounted under the body, to imitate part of the exhaust system, and the cylinder is hidden inside the openable trunk. Its working principle is very simple – there is an axle behind the rear suspension, connected to the drivetrain, and it has a wedge belt wheel with a tire on it. When the brake is activated, two liftarms are pneumatically pressed to the sides of the tire, causing the motor to stall due to increased resistance, and thus stopping the car in an effective but gentle way. I was afraid of damaging some drivetrain parts while braking, hence the use of a tire as a ‘muffler’ between the brake and the actual drivetrain.

Photos:

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  1. Sariel
    August 28th, 2009 at 15:45 | #1

    @bricklvr
    I’ve made suspension modules with instructions that allow to make a 4×4 vehicle. You will find them in the Ideas category.

  2. bricklvr
    August 28th, 2009 at 15:39 | #2

    dear sariel,

    could you please post a video or some pictures of how to make 4×4? i am having an extremely hard time with it and i need some help. please?

  3. Sariel
    July 1st, 2009 at 22:20 | #3

    @Eric Albrecht
    Yes, it was slow. The brake is in fact a parking brake. The gearbox is manual, that is it can be only shifted by hand. There are two differentials, one for each axle.

  4. July 1st, 2009 at 22:08 | #4

    I like the styling of this car very much, especially the diagonal braces over the engine.

    Since the brake is actuated from a switch in the cabin, is it actually usable when you are driving the car remotely? Or is it more of a parking brake?

    I see a red driving ring and what appears to be a transmission underneath. Can the car be shifted while in motion? I don’t see any differentials so are all 4 wheels locked together?

    It took me quite a while to find where you had hidden the RC motor. It looks like you drive the car through a gearbox with a worm gear. If so, does it move very slowly (no video on this one)?

  5. July 1st, 2009 at 21:41 | #5

    @Sariel
    8880 has 3 differentials, front, rear, and center. Only 8466 has as many.

  6. Sariel
    March 21st, 2009 at 20:56 | #6

    @Arnau
    Two. Use peeron.com to find answer to questions like this.

  7. Arnau
    March 21st, 2009 at 20:04 | #7

    how many diferentieals do you get with the set 8880

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