VehiclesArrma Mini Kraton 3S DSC
Arrma Mini Kraton 3S DSC
1/16 scale · monster truck · ARA2508
- Top speed
- 53mphcalculated
- Final drive
- 6.56:1
- Tire
- 90mm
Specifications
Last modified
| Spec | Value | Basis |
|---|---|---|
| Drivetrain | ||
| Pinion | 24TStock | Stock |
| Spur | 63TStock | Stock |
| Transmission & axle | 2.50:1Stock | Stock |
| Spur ÷ pinion | 2.625:1Calculated | Calculated |
| Final drive | 6.56:1Stock | Stock |
| Wheels & tires | ||
| Tire diameter | 90mmEstimated | Estimated |
| Rollout | 43.1mm per motor turnCalculated | Calculated |
| Power | ||
| Motor | 3000KVStock | Stock |
| Motor shaft | 3.175 mmStock | Stock |
| Battery | Up to 3SLiPoStock | Stock |
| Performance | ||
| Theoretical top speed | 53.5mph on 3SCalculated | Calculated |
| Motor speed | 33,300rpm, no loadCalculated | Calculated |
| Advertised top speed | 50mphMaker's claim | Maker's claim |
| Vehicle | ||
| Part number | ARA2508 | |
| Scale | 1/16 | |
| Class | Monster truck | |
Stock is as the vehicle ships. Calculated is worked from the stock figures on this page rather than stored beside them, so the two cannot drift apart. The top speed is kinematic: an ideal no-load RPM with no slip and no loss under load, so a real car is slower. The maker advertises 50 mph, which is their own claim on their own conditions.
Gearing parts
| Component | Teeth | Pitch | Bore | Part number |
|---|---|---|---|---|
| Fitted at the factory | ||||
| Pinion | 24T | Mod 0.5 | 3.2 mm | ARA-2175 (opens in a new tab) |
| Spur | 63T | Mod 0.5 | Not applicable | ARA-2990 (opens in a new tab) |
Tooth counts are the ones in the specifications above. Pitch is given as metric module (Mod 1, Mod 0.8) or diametral pitch (32P, 48P). They are different standards and are not interchangeable, even where the numbers look close. Bore is the pinion’s hole, listed separately from the motor shaft (3.175 mm on the stock motor). Linked part numbers go to the maker's or official distributor's page for that part.
How these numbers were settled
A 1/16 brushless speed monster truck, unrelated to the 1/8 and 1/10 Kratons, with a Spektrum Firma 2848 3000Kv motor and the Spektrum Firma 40A 2-in-1 ESC and receiver rated for 2S or 3S LiPo.
- Horizon's spec table prints Pinion 24T, Spur Gear 63T, Internal Gear Ratio 2.50 and Gear Ratio 6.56, and 63/24 x 2.5 = 6.56, so the printed 6.56 is the final drive.
- The standard-parts list shows a 63T centre diff, 30T diffs and 12T input gears.
- No diameter is printed for the dBoots Copperhead 2 Mini tire; 90mm is worked out from Horizon's printed roll-out of 43.10mm per motor turn: 43.10 x 6.56 / pi = 90mm.
- Stock gearing computes to about 53 mph at 3.7V per cell against Arrma's 50+ mph.
Documents
- ManualInstruction manual (Horizon PDF) (opens in a new tab)
- Exploded viewTechnical pack: pinion change, gear options, exploded view (Horizon PDF) (opens in a new tab)Pinion and spur options list (STD/OPT); motor mount chart
Sources
- ARA2508horizonhobby.com (opens in a new tab)
- searchhorizonhobby.com (opens in a new tab)
- ARA-2672horizonhobby.com (opens in a new tab)
- ARA-2175horizonhobby.com (opens in a new tab)
- Manual (PDF)horizonhobby.com (opens in a new tab)
- ARA-2990horizonhobby.com (opens in a new tab)
- SPMXSM4900spektrumrc.com (opens in a new tab)
- SPMXSM4900horizonhobby.com (opens in a new tab)
Every figure on this page traces to one of these. Where they disagreed, the note above says which was used and why.