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  #1  
Old 11-06-2010, 04:29 PM
Brooks Brooks is offline
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Default 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  
Old 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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  #3  
Old 11-07-2010, 01:01 AM
Brooks Brooks is offline
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Default Why?

Why is this not a very good option. Is it not powerful enough???
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Old 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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  #5  
Old 11-07-2010, 07:19 PM
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Arnie Madsen Arnie Madsen is offline
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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  
Old 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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  #7  
Old 11-08-2010, 03:54 AM
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Yes the mac 72 really produces about 50 hp and the super mac produces about 70hp

Last edited by GYRO J; 11-08-2010 at 05:55 AM.
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  #8  
Old 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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  #9  
Old 11-08-2010, 01:02 PM
Brooks Brooks is offline
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Default Great:)

That's great! Thank you very much.
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  #10  
Old 09-22-2013, 01:25 PM
Big E Big E is offline
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I have most of the drawings for your gyro maybe all of them as well as the maintenance manual.
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  #11  
Old 09-22-2013, 01:44 PM
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Default Welcome to the forum Eric!

As you get more used to responding to posts you will find the date of the last post is helpful.

Often peopleís gyroplane fantasy is transient and the interest that spawned the thread may have waned if it is more than a few months old.

The last date before your post on this thread is 11/8/2010.

It would help us answer questions if you would fill our your profile as far as your aviation experience and your aircraft.

Thank you, Vance
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  #12  
Old 09-22-2013, 04:34 PM
Big E Big E is offline
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Thanks Vance, after checking on the D O T web site it showed only 3 gyro owners registered in Canada, I have inquired over the past number of years only to realize it is nearly impossible to get licensed here in Canada in gyros.
It would appear best to take my gyro to the us and do the training there.
What would you think best Vance?
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  #13  
Old 09-22-2013, 04:43 PM
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Default I donít know enough to have an opinion Eric.

Hopefully someone who does know something will see this or you might start a new thread just about how to learn to fly a gyroplane in Canada.

I know they have training in Canada because at least two of the forum members were trained there.

They also had a recent training fatality in Canada.

Good luck on your gyroplane adventure.

Thank you, Vance
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  #14  
Old 09-22-2013, 10:57 PM
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Big E


The Transport Canada aircraft registration website currently shows 203 gyrocopters registerd in Canada not 3.


Many are old and likely to be unairworthy however there are a few more modern machines to including Calidus, DTA J-RO, Magni M24 Orion, ELA, Magni M16 and even a Cavalon plus dozens of RAF 2000s and plus dozens of Bensens registered back in the 60s.


In theory the link below shows them

http://wwwapps2.tc.gc.ca/Saf-Sec-Sur...en/current.asp




Steve
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  #15  
Old 09-23-2013, 08:14 AM
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Hello and welcome Brooks:
I fly a Mac powered B-7m Bensen. It is a sweet flying little bird.
Dr. Bensen designed the B-7 and B-8 to be powered by either a McCulloch or Volkswagon engine. This configuration maintains a near to centerline thrust.
In the 1970's and 80's there was a desire to install and run Rotax engines on these designs. When the engine is just installed by raising the mounting location on the mast; to turn a larger diameter propeller. It creates a HIGH THRUST LINE machine. This is a very pitch unstable configuration. This configuration is highly susceptible to PIO (pilot induced oscolations) and PPO (Powered Push Over). PIO will lead into PPO, a PPO is an UNRECOVERABLE flight condition.
All of the PPO's that I am aware of, NONE of the Pilots survived!!!!!!!!
It leaves a "Smokin Hole" and a grieving family.

If you rebuild the Bensen into it's original configuration and RECEIVE PROPER TRAINING, this can be a very rewarding experience; and give you many years of pleasurable flight.

If you are still considering a Rotax on a Bensen frame; Then a rebuild into a dropped keel design is the proper way to proceed.
Or, a complete new airframe with a dropped keel or raked keel design built around the Rotax engine.

I hope this does not scare you away from our sport, I just want you to be aware of the risk.
Ask all the questions you want! you will find a great deal of help, here on the Rotaryforum.
Once again, Welcome!
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