Tag Archive for: Aerospace

Cotta recently repaired this High-Speed Gearbox Model SN1939-1 which has been in use for almost 14 years by a leading aerospace manufacturer of jet engines and related components. Our SN1939-1 gearbox is used to test production parts, such as engine-related components, at their manufacturing facility. During routine preventative maintenance, our customer noticed the gearbox had about a “tablespoon of metal debris” that collected on a magnet at the bottom of the gearbox. From our inspection here at Cotta, we found one bearing wasn’t spinning freely on the high-speed shaft – which we discovered also had a small chip in the shaft. Our Genuine Cotta Repair Service begins with a thorough inspection, cleaning and complete evaluation and then, after our diagnosis, only Genuine Cotta Parts are used as replacements during our reassembly process.

Model Series SN1939 High-Speed Gearbox Specifications:

  • Nominal Power of 600 hp
  • Max Output Speed of 30,000 rpm
  • Ratio Range up to 14.40 overspeed
  • Max Accel / Decel Rate of 2,000 rpm/sec at output
  • Approximate Weight of 1,600 lbs.

Model SN1939 is a foot-mounted, two-stage increasing, two output, high-speed gearbox that is designed for test stand use. This model has a stub input shaft and two aerospace output pads typically AND20006. Both output pads have the same direction of rotation and the same ratio. There is a special design option to have a different ratio on each output. Contact Cotta engineering for information on per head power capability. For more information about Cotta SN1939 and other high-speed gearboxes in our line, visit our High-Speed Gearboxes Page.


Cotta specializes in high-speed gearboxes for testing rotating components, with aerospace being one of the key markets. Built to provide many years of service, Cotta high-speed gearboxes are offered in a variety of standard and customized designs. Cotta has the ability to start with a “clean-sheet design”, which allows us to show you our versatility and experience to engineer a customized gearbox solution that fits your personal requirements and needs.

Cotta SN3396 High-Speed Gearbox

Cotta Model: SN2285

Output Speeds: Up to 90,000 RPM

Power Capacity:  300 HP

Weight; 270 lbs.

Market: Aerospace

Click the link below to view some of Cotta’s high-speed gearbox models:

High-Speed Gearbox Models



Cotta has another high-speed gearbox in process for a test stand application that will be used in the aerospace industry. The housing for this gearbox is currently being machined on Cotta’s Milltronics HBM110XT.  The machine is ideal for this type of part, as it provides a large working table that can handle the heavy duty load capacity.

Gearbox Ratios, Torques & Speeds:

  • Ratios 1 : 8.36
  • Max Torque: 855 in-lb @ 27,239 RPM
  • Max Speed: 29,963 RPM

Low Speed Fuel Pump:

  • 1 : 2.61
  • Max Torque: 1,456 in lb @ 8,525 RPM
  • Max Speed 9,378 RPM

Main Fuel Pump: 

  • 1 : 11.00
  • Max Torque: 486 in lb @ 34,900 RPM
  • Max Speed: 38,390 RPM

Approximate Weight: 1,619 lbs

Cotta has designed and manufactured a diverse line of high-speed gearboxes that are used by some of the largest OEM companies in the world for numerous R&D and production test stand applications for automotive, aerospace, and industrial components.


Milltronics HBM110xt