- Aircraft Make / Model
- Work Undertaken
Propeller Redesign, Propeller Reproduction
Wim Stapel, Tiger Moth
Propeller arrived perfect and the day after arrival was put on our Tiger. Starting up was already a great difference as the engine run real smooth with the new propeller. The noise seemed to be also less. After test running it and flying it for an hour we re-torqued it and made another 5 hours (now with the perfect stable weather) and it is a joy to fly.
Performance and smoothness of operation is great and we are real happy with it.
Following frequent requests from Tiger Moth owners, engineers and restorers, for a prop that not only performs well but also looks like the original propellers fitted by De Havilland, we accepted the challenge to design and produce such a prop.
For the hub, we copied the exact shape of the De Havilland made DH 5220 original fitment, but with a 72 mm centre bore, so it will fit either taper or spline type Gipsy Major prop drives.
To the bystander, the blades closely resemble the symmetrical plan form of the originals, blending into the hub with the correct curves, looking just right with our elliptical tips.
Although the propeller looks like the originals, needless to say, we employed our sophisticated computer programs to fine-tune all of the parameters that go together to make an aerodynamically optimised propeller.
Looking good is not enough on its own. The propeller has to perform, so we called on Henry Labouchere – life long DH Moth pilot, engineer, restorer and raconteur – who better to asses the performance of our design?
Following thorough performance test flights, Henry declared:
“It is at least equal, if not better in performance to the best Tiger Moth prop I have ever flown and noticeably smoother than any”
Quite an accolade. Anyone who has flown with a Hercules Propeller will tell you how smooth they run and this can only be good for your engine and airframe condition.
Testing with a very standard, low compression engine Tiger Moth, Henry recorded a cruise speed of 78-80 kts at 1900-1950 RPM and achieving very good take off performance and an initial rate of climb close to 700’/min with two people on board.
So there we have it, a propeller designed specifically for the Tiger Moth, which looks like it is straight out of the 1930’s yet optimises the aircraft’s performance throughout the flight envelope.
Being a bespoke manufacture, we can finish our propellers in a colour of your choice, and in either a satin finish like the one pictured on this page or full gloss as seen elsewhere on this site. Of course we can also finish a Tiger Moth propeller in clear varnish with a hand stamped hub, displaying the beauty of the wood. Alternatively, a combination of both looks very period, a clear varnished hub with painted blades.
All Hercules propellers are fitted with ‘Hercuthane’ bullet proof leading edges. By far the most durable leading edge protection from stones and rain.