Model: (Click to see more) 58067: Thundershot
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Well at long last I can say I have finished this truck and I'm moving onto the next one now. The truck now runs with this heavy plastic shell for display/mud bogging/bashing and it runs a lightweight lexan shell for crawling.
Final enhancements to the original design are as follows:
1) Rotated motor/reduction unit so that motor is at front of vehicle for better climbing ability.
2) Wheelbase stretched again to 13.5'
3) Wider offset wheels handmade from gluing the drive portion of a thundershot wheel into a 2.2' truck wheel.
4) Adding more lead weights into wheels and around lower axles.
5) Chopping front and rear chassis off completely to reduce weight up top and allow fitting shorter shell. Also improves approach and departure angles.
6) Moved battery saddle packs further forward on chassis to aid climbing ability. These are tie-wrapped to chassis and get charged in place for most use. I get approx 40mins runtime from these Sanyo 2000 NiCD's.
This vehicle has been used almost daily for 6 months now. It has proven to be quite capable and very reliable. I have only suffered broken traxxas slider shafts due to extreme angles which has since been remedied with longer wheelbase. Only negative is the high CoG on this vehicle. Side slope ability is just 37 degrees with the normal offset wheels (the HPI MT Mesh chromes) and 45 degrees with my own custom offset wheels (the black ones in the pics). It was built to prove that decent crawling ability can be had without spending loads of money and I think this vehicle proves the point nicely, total cost to build was £127.
Vehicle spec is now:
11' wide (standard offset MT wheels), 13' wide (custom wheels),11' high
18' overall length
Novak Super Rooster ESC
RS550 motor with torque ring
Graupner 3:1 reduction unit
65:1 overall reduction
2.2' IMEX Swamp Dawgs or 2.2' IMEX G-Hawg tyres
18Kg 1/4 scale steering servo.
Total weight fully loaded 3.2Kg
2' under diff clearance
4' under chassis clearance
90 degree departure angle/85 degree approach angle
42 degree ramp breakover angles
8 7 6 13 3 1