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#1
01-07-2005, 06:04 AM
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Prerotator - Wunderlich Right Angle Drive
While searching past PRA mags on another topic I came across a blurb in the 8/01 issue where Wunderlich Inc. announced a Subaru EA81 prerotator using a miter geared right angle drive with a combination flex shaft and telescoping tube. The blurb quoted the latest test results as 300 rrpm. For more info phone numbers for Wunderlich (815) 838-0450 or Don Graves (413) 655-2906 were given as well as a email address DonaldDonplus@aol.com
I had forgotten about this and this is the last I heard of it. Anyone ever investigate using one? In looking at the pictures I was reminded of the one fitted to the front of the Sub on Dick DeGraw's Dominator hybrid. The black and white pictures didn't scan well or I would post them.
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Dean Dolph PRA (dues paying!) Life Member# 8907 EAA# 657196 Why Dean doesn't fly! http://www.rotaryforum.com/forum/sho...20439#poststop Everything should be made as simple as possible but not simpler! - Albert Einstein Everything in moderation including moderation - Mark Twain There's is no future in growing old - Me! 
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#2
01-09-2005, 11:36 AM
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ea81 prerotator
Dean,
I had one of these units when I was working on my turbo ea81. And although I finally dumped that engine project (difficult to find non-cracked turbo ea81 heads), the prerotator fit well over the front pulley. Another advantage was the possibility of running an efficient, square, telescoping drive shaft up to the mast. If the flex shaft is used, friction would be reduced significantly due to the reduced bend compared to the usual rear-mounted drum setup. I traded the unit back in to Dick for another unit when I changed engines. It looked like it would have worked well. Rob
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#3
01-09-2005, 02:42 PM
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Dog gone it! I am building a right angle drive for my gyro, I didn't know one was available!
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The government cannot give anything to anybody that the Government does not first take from somebody else. “I prefer dangerous freedom over peaceful slavery.” - Thomas Jefferson Scott Essex....Flying H Ranch
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#5
01-09-2005, 05:39 PM
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Does Wunderlich have a web site? Where do people purchase their prerotators from?
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Tim Chick Watch videos of Bensen Days 2007 - http://www.youtube.com/view_play_lis...B8C1F17B074D3F Watch videos of Bensen Days 2008 - http://www.youtube.com/view_play_lis...DCDDF78B4169D3 Watch Gyro TV -------------------- http://bellsouthpwp.net/t/c/tchick/gyrotv.html My Sport Copter Build -------------- http://www.rotaryforum.com/forum/showthread.php?t=25142
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#6
01-10-2005, 02:03 AM
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No website, just a phone and fax# in the back of ROTORCRAFT mag.
__________________
The government cannot give anything to anybody that the Government does not first take from somebody else. “I prefer dangerous freedom over peaceful slavery.” - Thomas Jefferson Scott Essex....Flying H Ranch
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