Lang propellers

JohnFitz · 2 February 2010, 09:00 PM

By any chance can anyone tell me the diameter of the Lang 3770 prop? Thanks for your consideration.

YavorD · 3 February 2010, 01:11 AM

Lt Col RC Gardner's database (Version 2) shows LP3770A (Lang design, Right-Hand Tractor) propeller used on Martinsyde F.3 with RR Falcon III engine, no diameter or pitch data.
LP3777A propeller, however, for the same airframe / engine combination, is listed with diameter of 2850 mm and pitch of 3050 mm.
Regards,
Yavor

JohnFitz · 3 February 2010, 04:42 AM

Thanks Yavor, once again you have been very helpful. Just wondering how much info. you have on the Martinsyde F.3? I am in the process of making a building plan for a 1/4 scale model and trying to make sure all the dimensions are to scale. I have found a discrepancy with the height between the printed text and the Mick Davis drawing. I am wondering if the L/G legs were changed in length when they went from the four blade (short) prop to the longer two blade prop. Do you have anything in regard to the length of the L/G legs?

YavorD · 3 February 2010, 05:17 AM

I have only superficial recollection on Martinsyde F.3. Will see what is inside Ray Sanger's The Martinsyde File.
Also, there should be something in Flight Archives of 1919/20.
Regards,
Yavor

JohnFitz · 3 February 2010, 05:45 AM

Thanks Yavor, I have the book, The Martinsyde File and it does not include the l/g length. It just gives the degree of angle the leg's are on. I appreciate whatever you can find. Cheers.
John