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#1
11-06-2010, 04:29 PM
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Bensen in Canada:) EH!!!!
My name is Brooks and I just purchased a Bensen B8M. It's complete except for the engine. I'm thinking maybe 503 rotax. I have been dreaming about finding one of these and restoring it and flying it. Unfortunately I have no experience with them and would like to learn as much about it before I start to buy parts for it. I'm would like to buy new blades and a rotor head with pre rotor but have no idea where to start. I would like to start with education. I'm trying to learn all the different parts that are on this unit. If anybody has any diagrams of the B8m and the different parts I would love to see them.
mac802@gmail.com Last edited by Brooks; 11-06-2010 at 06:47 PM. Reason: forgot something 
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#2
11-06-2010, 06:49 PM
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Do you have any gyroplane flight experience?
Dropping a 503 on a stock Bensen frame is not the best option but it would work. Tim Chick did it to his Bensen and it flew okay with a 52" prop. A 60" prop would work better but that means chopping the frame and converting it to a step keel. Here's some reading to get you started: http://www.rotaryforum.com/forum/showthread.php?t=16758
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Mike Gaspard Forum Administrator Kaplan, Louisiana Bensen B8MG, NX36MG
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#4
11-07-2010, 04:49 AM
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50HP into a small 52" diameter prop will give you less thrust than if you used a larger 60" prop. The larger prop will more efficiently convert your HP into thrust. The Mac engines worked with the 52" prop but the put out a bit more power than the 503.
The 503 with a 52" prop will work though, as Tim conversion showed.
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Mike Gaspard Forum Administrator Kaplan, Louisiana Bensen B8MG, NX36MG
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#5
11-07-2010, 07:19 PM
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With envy I welcome you to the forum Brooks. You live in Kelowna BC and own a gyro that only needs an engine. Do you realize you are about one millimeter from heaven ?
Welcome ... Never mind me , I envy everybody who lives in Kelowna. Beautiful city with a great climate. What is your elevation there ? If I recall , you are surrounded by mountains but have a huge valley to fly in. Best of luck choosing an engine. Lots of guys will help you here. Keep asking and keep searching this forum. Most of your questions will be answered. Got any pictures of your airframe? We love build projects at any stage. Stay in touch. We need more new guys like you. Thanks. Arnie
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#6
11-07-2010, 07:51 PM
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Long long ago in a galaxie far far away and in a old old PRA magazine there was a article about the Mac "72 and what the "efficiency" of the 72 was at the rpm it turned to get the 72 hp and it turned out to be quite a bit less than 72, seems like it was around 50 plus hp or what a 50 plus horsepower engine would do if it were turning a efficient prop and the most effieicnt speed. Anyone remember that far back to remember that article and the exact "efficient " hp ???
Tony
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#8
11-08-2010, 12:30 PM
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Hi.
An email has been sent to the address in your first posting. It contains the name and phone number of a person in Kelowna who is very knowledgeable about helicopters, plus he said that he had plans etc. on the Benson gyrocopter. You may wish to phone him. Dave
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