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General control line discussion => Open Forum => Topic started by: Mike Griffin on July 11, 2021, 05:55:30 PM
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Allan Perret was a close friend and the one who talked me into kitting Otto the Giro. Allan designed all the jigs to put on my band saw when we were cutting angles on the rotor blades. He also designed the rotor hubs for me that held the blades. We had so much fun doing all that and I still miss him very much.
https://youtu.be/moJ4watCEB0
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Can't open video - says "PRIVATE"
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Can't open video - says "PRIVATE"
Same here.
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Can't open video - says "PRIVATE"
Sorry Bob. I had it as private accidentally. Just made it public.. Try it now
Mike
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Same here.
Sorry, I had it as Private. Just made it public... try again.
Mike
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Video works great at this time, as does the plane in flight. I will admit that I skipped forward until right before launch signal. That said, still curious as to the hub design.
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…That said, still curious as to the hub design.
https://outerzone.co.uk/plan_details.asp?ID=7346
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I need to get off my duff and get my kit put together. D>K
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I have that OTTO Giro
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Video works great at this time, as does the plane in flight. I will admit that I skipped forward until right before launch signal. That said, still curious as to the hub design.
Peter, the hub was designed and cut by Allan out of polypropylene material. It was quite ingenious and Allan was a master at doing things like that.
Mike
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https://outerzone.co.uk/plan_details.asp?ID=7346
Hi Paul,
The hub design shown in this plan is not the hub Allan and I designed and put in the kit.
Mike
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Mike thanks for sharing the video. We all miss Allen
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Peter, the hub was designed and cut by Allan out of polypropylene material. It was quite ingenious and Allan was a master at doing things like that.
Mike
The one on the plan should work OK, shouldn't it? You just just make the change for ease of production and such, correct? Should be OK for a one off scratch build.
Type at you later,
Dan McEntee
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Dan
The one on the plan is Dick Mathis' original hub.... I have used it on my 'Otto' since 1975 and three or four different rotors.... Works great!
Jim
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Good video! Really surprised the rotor is not spinning faster - looks like it is not providing any (?) lift.
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The easiest way to explain these rotor hubs is to just show them. This way you can see how the sanded to shape rotor blades fit into the hub. We simply expoxied the 3/8 thick rotor blades into the hub and they were automatically set at the proper angle. There was a 1/8" hole drilled in the center of the hub and you dropped in right over the 1/8" piece of music wire and it was held in place with wheel collars. Hope this helps . Here are the pictures
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The genius in these hubs was how Allan designed a jig to cut multiple hubs.
Mike
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The one on the plan should work OK, shouldn't it? You just just make the change for ease of production and such, correct? Should be OK for a one off scratch build.
Type at you later,
Dan McEntee
Hi Dan,
Sure the one on the plan would work. This we thought was just much easier for the builder and the work was already done. All you had to do was insert the rotor blades and glue them in.
Mike
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By the way, the Otto kit was the biggest selling kit I ever produced. It even outsold the IMITATION kits. Eric Rule did the cad work for me after I conferred with Dick Mathis. Eric was stunned by the amount of orders I got for cutting. Ask him sometime. LOL
Mike
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After Allan died, the jig he developed to cut the leading and trailing edge on the rotor blades and the jig to cut the hub angles, somehow disappeared. We never did find out what happened to them.
Mike
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Got your message, Mike.
Thanks for posting that great video - it really impressed me as the only autogyro I've ever seen was a real one.
It flew over me in the Philadelphia area.
Really strange sound.
Bob Z.
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Good video! Really surprised the rotor is not spinning faster - looks like it is not providing any (?) lift.
The rotor is spinning faster than you think. Look up “Wagon Wheel Effect” on Wikipedia. The visual position of the rotor (what you see) is affected by the frame rate of the video camera taking the video, and sometimes a second time by the compression software and/or video player being used. Wagon wheels in old movies sometimes looked like they were going backwards because of the frame rate of the movie projector.
So the rotor that seems to be rotating too slowly was actually probably more like a blur as seen in person. Build one and find out for sure LOL.
Paul W.
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The rotor is spinning faster than you think. Look up “Wagon Wheel Effect” on Wikipedia. The visual position of the rotor (what you see) is affected by the frame rate of the video camera taking the video, and sometimes a second time by the compression software and/or video player being used. Wagon wheels in old movies sometimes looked like they were going backwards because of the frame rate of the movie projector.
So the rotor that seems to be rotating too slowly was actually probably more like a blur as seen in person. Build one and find out for sure LOL.
Paul W.
Paul you are exactly right. I was going to say that but you beat me to it. When we were flying them, the rotor blades were a blur.
Mike
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The rotor is spinning faster than you think. Look up “Wagon Wheel Effect” on Wikipedia. The visual position of the rotor (what you see) is affected by the frame rate of the video camera taking the video, and sometimes a second time by the compression software and/or video player being used. Wagon wheels in old movies sometimes looked like they were going backwards because of the frame rate of the movie projector.
So the rotor that seems to be rotating too slowly was actually probably more like a blur as seen in person. Build one and find out for sure LOL.
Paul W.
DOH! Of course, I should have realized that. I did not see any transitional "blur" so that threw me, plus on the touch-n-goes the rotor spin became immediately visible. Don't know about building one, but I saved my dad's Edco Autogyro that he built around 1960 or so. Wonder if the rotor would stay together after 60 years????
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Some years ago I saw the video of Allan flying the 1/2A version where I could swear it did an outside loop.
I contacted Allan and asked if I could borrow the 1/2A and fly it at SMALL.
He didn't know me too well but at no small expense he shipped it to me. It was big hit at SMALL that year although no outside loops were made.
When I heard of his passing I was deeply saddened.
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You guys talking about the rotor turning slowly or stopping even going back wards. I have noticed on all digital videos the props of planes turn slowly or stop and on landing the wheels even turn backwards. I have been watching a lot of digital videos of planes and race cars. It must be the electronics of the videos that cause that. But then again old movies it looked like wheel were moving in the wrong direction. H^^
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Mike, that was too cool. Ken
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Nice video and memories, Mike! Allan seemed to be a creative and generous modeler in the only couple of times we communicated.
We've had at least a couple good Otto's here with the North Coast club, both by really good builders. Gary Hull's half-A and Dave Rigotti's larger version each flew well right off the building board. 'neat design and fun!
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Are any of the kits still available? If so, where can a person order one and how much will it cost? :)
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I sell laser cut kits for the Baby Ringmaster Gyro and the Ringmaster Gyro. The Baby will do inside loops very easily. I do not believe that an autogyro can be put in a negative G situation without a crash.
The Baby Ringmaster Gyro Kit lists for $51.64 plus shipping.
The Ringmaster Gyro Kits list for $99.25 plus shipping.
The electric version of the Ringmaster Gyro lists for $109.25 plus shipping.
Send me an email at: patdk@aol.com with your zip code and I will quote shipping. Active duty military and first responders get a 15% discount on the kit costs. Veterans and past first responders get a 10% discount on the kit costs.
Pat
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Jim the kits that Pat produces are top quality and fly very well. I kitted the Otto the Gyro several years ago with the permission of Dick Mathis and that kit is no longer available.
Mike
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Nice video and memories, Mike! Allan seemed to be a creative and generous modeler in the only couple of times we communicated.
We've had at least a couple good Otto's here with the North Coast club, both by really good builders. Gary Hull's half-A and Dave Rigotti's larger version each flew well right off the building board. 'neat design and fun!
Hi Serge,
Your observation about Allan was right on. He was very creative and I wish everyone could have seen some of the things he came up with. When he died it left a big hole in all of hearts in the club. We still miss him to this day.
Mike
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Pat does great work. the only problem we had was the USPS putting the package on the shelf instead of the truck.
In fact all these guys put out great kits, Walter Umland, Pat, RSM, Brodak, SIG, Mike and those that don't produce kits any more because politics have put prices out of range. In one of the early issues of Model Aircraft Sig had a small ad that I thought was exspensive until I went to local hobbu shop back then . 1/16 sq balsa 3 strips for a penny plus postage. Can't remember if he had minimum order. D>K