Hoffman motorglider prop

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Site Admin
Posts: 485
Joined: Mon Jul 19, 2004 2:26 pm
Location: Port Elizabeth

Hoffman motorglider prop

Post by whisper » Sat Oct 14, 2006 4:53 pm

The diameter may be a bit small for a Whisper but it sure looks like the real thing!
This beautiful fully functional hand made prop is the work of Noël Rumers
of Antwerp Belgium. The rest of the model motorglider taking shape behind the prop is equally precise.
Probably more work than building a full size one!?
prop1.JPG (47 KiB) Viewed 2831 times
prop2.JPG (111.97 KiB) Viewed 2831 times

Johan Nortje
Posts: 82
Joined: Sun Jan 16, 2005 10:12 am

Fit a hoffman prop

Post by Johan Nortje » Sun Jul 01, 2007 11:20 am

I fit ZU-JWN with a Hoffmann featherable prop and was pleasantly surprise with the difference in performance.
My max speed goes up from 160 kph to 210 kph = 50 kph
Cruise 190kph at 2800 rpm.
My climb rate at 2700ft goes up from 350 ft /min to 550 ft /min = 3250rpm

Russell, cableman made me a new state of the art cable and I can now change pitch for cruise at 2200 rpm inflight airspeed , 120 kph no need to stall the aircraft. To change to fully fine again I reduse rpm to 1000 pull the cable and pitch is set. Works 100%

Nothing wrong with aerovee. I am 100% satisfied.

Seems to me I must sell the Express and not the glider.

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