Powervamp Coolspool 29 28V Aircraft Portable Start Unit

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Produced in partnership with Powervamp, the Coolspool 29 is available in two nominal output voltages, 28V DC. This aircraft start unit is used extensively on larger twin turbine aircraft and helicopters where additional amp/hour capacity is required to maintain voltage under load.

Upper Fadec limits vary according to the manufacturer’s software and for this reason two versions of the Coolspool 29 are available.

When compared to a 24V DC start unit of the same capacity, the Coolspool 29 delivers a significantly higher performance, resulting in faster spool-ups and cooler starts impacting directly on turbine life.

This aircraft start unit is designed to be carried on board for emergency power or turbine starting and is fitted with an automatic 3-stage internal charger for maximum cell longevity.

The Coolspool 29 is fitted with solid state voltmeter with ‘push to view’ button to monitor battery voltage.

A spring-loaded output cover ensures the aircraft start unit is cleared for air transportation. Supplied with NATO lead set, charge lead and heavy-duty canvas protective jacket.
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -


  • High powered sealed lead acid batteries
  • Cleared for air transportation
  • Internal charger with LED status indicator
  • Corrosion resistant aluminium case with carry handle
  • Controls protected by twin front protection bars
  • Aircraft cable with heavy-duty NATO connector
  • Spring-loaded output connector cover
  • Auxiliary socket for plug-in accessories
  • Solid state voltmeter with ‘push to view’ feature
  • Fitted with rubber anti-slip, shock absorbent feet
  • Heavy-duty canvas protective jacket


  • L: 16" (405mm)
  • W: 5" (135mm)
  • H: 13" (345mm)
  • Weight (28V DC Version): 63 lbs. (29kg)
  • Peak amps**: 2400A
  • Nominal voltage:
  • Standing voltage: 27.8V DC or 30V DC depending on model
  • Amp/hour capacity: 26 Ah @ 10 hr rate (20°C)
  • Operating temp: -40°C to +45°C (-22°F to + 114°F)
  • Case: Aluminium with shock absorbing feet
  • Voltmeter: Solid state LED, IP65
  • Aircraft cable: 2m (6ft) with heavy-duty rubber NATO connector
  • Charger: 1.9A 3-stage internal charger / 90–264V AC / 47–63Hz / single phase 28V DC
  • NCAGE: KD628

  • NOTE: ** Peak amps is a theoretical calculation of the instantaneous current from a momentary dead short across the battery terminals. It is not representative of the power delivered at the aircraft plug which is significantly less, due to cable losses and other factors.



Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.