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Carbon fibre composit adjustable pitch Propellers.

General information

Being an aviation engineer and professional light aircraft designer-builder, I use and compare different propellers from 1987 year. I used composite, wooden, plastic and metal; constant pitch, ground and inlight adjustable; constant and variable RPM propellers not only for aircraft but also for hovercraft, airboats etc. Working in Europe and Nort America, I think I tried all propeller brands.
Many amateur builders and pilots underestimate the importance of the propeller for their craft. They think cheaper is better. If they are not happy with their aircraft performances, noise or vibration, they think about changing the engine for more powerful one, redesigning the motormount, muffler etc. But the problem can be fixed much easier very often. I always advise to start thinking "from the prop". Is it well matched to your engine and craft? Is it in good shape, well balanced? Is it a good, efficient brand? My experience - a good correctly chosen and installed prop can fix such problems in more than 50% of cases. To change the prop is much faster and cheaper than changing the engine, but the effect can be the same.
I don't use anything but KOOLprop now. My opinion - this is just the best propeller for most prop driven crafts regarding its quality, efficiency and price. Most of my clients using KOOL have the same feeling. Read below about

KOOLprop - just the best!

KOOLprop is designed and made for different airscrew driven vehicles, included PPC and PPG, airboats, hovercraft, Ultralight and Light Sport aircraft. There are 20 different prop blade models for different applications, right and left hand rotation, pusper and tractor, straight and scimitar shape, from 47” to 73” diameter. As a standard, they come as 3 blades but 2, 4 and 5 blade props are available too. You can use them with a lot of engines from Simonini PPG 18HP to powerful Rotax 914 and Subaru-Suzuki-Honda autoconversions up to 180HP. Special reinforced blades can be ordered. Variable pitch prop hub was designed and tested in 2012, now in production.

I can compare KOOLprop with Kievprop I was flying and selling before. Koolprop has exactly the same hub design, CNC machined with D16T aviation aluninum and anodised. You can use your old Kievprop hub and spinner with Kool blades. There are some points making Kool preferable for me. They are both hand-made with highest accuracy but KOOL prop is made with carbon fibre + fiberglass composite instead of only fiberglass-made Kievprop. Koolprop blade is much more rigid, it helps reducing idle wobbling and slipstream interference vibrations. KOOLprop finish is epoxy gelcoat, not paint like Kiev, so KOOL surface is more hard and smooth, more difficult to scratch. As Kiev, Kool has integrated strong leading edge protection, but it is made with stainless steel (not copper). It looks more beautiful (always shiny) and it is stronger than Kiev LE. This thick metal LE makes KOOL preferable for Anphib and Float planes as well as STOL and Bush planes flying from unprepared runways - ideal protection against water splashes, tall grass, dirt, tiny rocks etc.


All blade models are designed using computer technologies, then tested in a wind tunnel and in flight + passed special destructive tests.
There are 2 types of Kool blades. Straight, classical-style one is able to produce more static thrust with the same diameter. It can be important, if you are restricted in diameter, for example in case of PPC, PPG, airboat. Can be more efficient for low speed crafts, low prop RPM. Scimitar-style modern blades are preferable for higher speed aircraft, high RPM powerplants. They are usually a little less noisy than straght type blades. Some Kool blade models have ant vortex blade tips like wings of modern airplanes, or semi-oval tips.

Koolprop standard set included 3 blades, hub, all hardware, pitch protractor and soft blade covers. Finish is excellent black gelcoat. All blades have white tips now as a standard for more safety. Running black prop disk is almost invisible, white tips make it visible. Kool can be ordered with white or black carbon-fiberglass 8”diam 9” length spinner (strongly recommended for tractor applications) and hub spacers.

We sell and use KOOLprops for all trikes and powerplants made by Air Trike Enterprises from 2006. They are used for many types and models of airplanes, trikes, PPC, PPG, Gyros, hovercrafts and airboats all over the world. Spare blades are available. If my client brakes one, two or all blades, he sends me the type and serial # of the blade printed on its root, and Air Trikes supplies spare blades already balanced and matched to his blades. Spare blade orders are always highest priority!
All KOOLprop users mentioned that KOOL is more smooth, silent, and provided better performances than their previous propellers. To see more pictures and read some feedbacks from pilots using KOOL props CLICK HERE.

KOOLprop 73

 Koolprop specifications.

- Diameter 47"-73"
- Maximum blade width 5.8"
- Maximum speed of rotation 3000 rpm
- Power of engine 18-180HP
- Range of operation temperatures +55 -20C*
- Stainless steel integrated LE protection.
- Hub type "Rotax" 582/912
- Available in left and right hand rotation, for pushers and tractors.

ATTENTION! This propeller is not recommended for direct drive engines without torsional dampers (Lycoming, Continental etc.)

A design description + assembling and installation instruction for this prop is HERE.

Koolprop has highest quality and very reasonably priced. We are always ready to help you with the best propeller choice. If you need a prop - call us or better send E-mail with the following info: engine type, HP, max power RPM, reduction ratio, max possible prop diameter, rotation direction, type of your aircraft, cruise speed. We usually have most propeller models in stock and can send the same or next day after your payment.


For additional information and order E-mail:, Use both addresses. Even if there are temporary problems with one, we will get your E-mail anyway.
Address: Air Trikes Enterprises
2241 Place de Belvedere
St. Lazare Quebec J7T2B1 Canada
Phone: (450) 202-7772