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| Type: |
SU-85 |
Armament: |
85mm |
| Built: |
March 2016 |
Armor: |
45mm |
| Builder: |
Mitch Anderson |
Rating: |
40/4 |
| Status: |
Operational |
Battles: |
0 |
| Owner: |
Mitch Anderson |
Points Earned: |
0 |
| Call Sign: |
Koshmar |
Points Given: |
0 |
| Notes: |
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Click Photo For Enlargement (56 KB)
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My son Paul and I, are great fans of the eastern front. Several of our ancestors fought on this front.
The SU-85 (Samokhodnaya ustanovka 85) was a Soviet self-propelled gun used during World War II, based on the chassis of the T-34 medium tank. Earlier Soviet self-propelled guns were meant to serve as either assault guns, such as the SU-122, or as tank destroyers; the SU-85 fell into the latter category. The designation "85" signifies the bore of the vehicle's armament, the 85 mm D-5S gun. |
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For material we opted for 1.42 MM thick stainless steel. It never rusts and is twice as hard as mild steel. I drew the shapes in CAD and had them cut with waterjet. |
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Click Photo For Enlargement (82 KB)
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Click Photo For Enlargement (114 KB)
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My little niece Ana, also participated. The motors are basic scooter motors 350W at 24V chain drive. |
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The suspension is based on torsion springs and pivot on the outside of the tank. The spring to the right is for the track tension and it is loaded to about 100LBS |
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Click Photo For Enlargement (94 KB)
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Click Photo For Enlargement (48 KB)
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The gun barrel is aluminum and proportional to the original. There was too much pressure building inside, so the balls were exploding before leaving the cannon. We bored 12 holes on the bottom in order to release some pressure and that fixed the problem. |
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Design engineer Paul Anderson is testing the armor strength. |
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Click Photo For Enlargement (101 KB)
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Click Photo For Enlargement (86 KB)
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The gun is actuated by a solenoid. Not an electronic gun. This is on all the time. |
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Overview
The tank is featuring two pairs of H bridge controllers, one pair for propulsion and one for the cannon motion. The H Bridge used is the Tohsiba TB9051FTG that I put on a custom made circuit.
They are each controlled by an ATmega2560 Processor. The processor takes the radio signal and does the mixing to the motors. I programmed 2 modes of turning: two tracks move in opposite direction or one track moves while the other stays put in order to pivot.
The cannon guidance is obtained by two DC geared motors. The pitch still has a lot of play, a dampener might be in order. Work in progress.
The battery is a 16AH LiPO at 24v. At cruise speed the tank burns about 10 Amps, so the battery should last over an hour. |
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Click Photo For Enlargement (237 KB)
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