Please view some of the Frequently Asked Questions about our engines below. If you have any additional queries, please submit them via email to: richard@adeptairmotive.com 
Question: What is the cubic capacity of the engine? 
Just less than 3.2 litres (196 Cubic Inches).

Question: What is the bore/stroke ratio? 

The engine has a fairly oversquare bore/stroke ratio (98mm x 70mm) in order to keep piston speed low, as well as fairly short con rods. The short rods give higher piston acceleration which helps in good cylinder filling early on the intake stroke. Narrow and light piston/ring components tolerate high acceleration well.

Question: Might the engine also be suitable for operation in a non-certified helicopter application? 

Whilst the company is focussing initially on fixed wing applications only, the engine is ideal for helicopter operation, as it can be mounted in any orientation, and can be optimised to provide high power and torque at constant speed as required in rotary wing applications. The PSRU negates the need for noisy belt drive and bolt-on gearboxes.

Question: Why is the ADEPT Airmotive not a compression ignition (diesel) engine? 

Although diesel has certain advantages with regards to fuel consumption and economy, we don’t believe that compression ignition technology is best suited to GA applications. Among the reasons for this are: 
  • Poor relationship between torque and power
  • Diesel engines have to be heavier to contain higher bearing loads
  • Diesel engines have poor power to weight ratios
  • Vibration
  • Satisfactory power generation generally requires high turbo boost with related reliability problems
  • Diesel fuel weighs more than gasoline
  • We can meet the fuel consumption targets by using an efficient gasoline engine.

Question: What aircraft will be using the ADEPT engines? 

The first 320HP engine will be fitted to the all composite SA Ravin 500 (similar to the Piper Comanche), a South African manufactured aircraft. The combination of the ADEPT engine and the Ravin airframe will result in one of the finest GA aircraft in the world. 

Question: What advantages do the ADEPT range of engines have over the traditional “Lycontasaurus” type engines? 

The ADEPT motor uses absolutely current engine technology, and therefore will be extremely economical and reliable. The ADEPT motor offers affordable acquisition and maintenance costs.

Question: What is the expected TBO of the ADEPT engine? 

TBO will be determined during the monitored flight test programme. Targeted TBO is in excess of 2000 hours.

Question: What is the advantage of a 120° V6? 

It is a compact design offering high efficiencies, light weight, low vibration levels and high structural integrity leading to long engine life.

Question: Does the ADEPT motor rev higher than existing engines – and does this not lead to rapid engine wear?

Current technology gasoline engines are most efficient at higher RPM than the RPM range at which the traditional type engines usually operate. The ADEPT engine’s average piston speed is in fact lower than that of conventional GA engines due to the optimum bore/stroke ratio used.

Question: The ADEPT engine uses a PSRU – are these units not a potential source of problems? 

The ADEPT PSRU is a thoroughly engineered unit. It is an integral part of the engine structure. The PSRU reduction ratio has been selected to provide low noise, and complete absence of annoying and dangerous harmonics. Robust gear forms, and more than adequate bearing areas, will ensure durability. The unit also incorporates a cush drive in order to protect the rest of the engine from prop strikes.


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