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  1. R

    660 turbo

    Brent, Gman, Scott The Suzuki Arctic Cat engine shown in the link was a custom project that we worked on with the owner. At 120HP at only 7000 RPM, it is the most powerful engine we developed to date. We just couldn't get enough volume of sled engines for conversion. I have retired from my...
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    Dragonwings 23' Blades/ Soma Rotorhead/ Other Gyro Parts

    I'm clearing out parts from my own personal gyro project. I need to sell these items to move forward on our new Honda® Jazz/Fit engine package development. I will be posting pictures as I take these items out of storage over the next couple days. First up is a set of 23' Dragonwing Rotor...
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    Show time..

    James Didn't see your project was an intermesher until my last post. Have always been interested in the Kaman and have wondered if a simple intermeshing gyro would be doable. Have seen footage of an RC intermesher gyro flying, but don't know if it would scale well. Assume your project is a...
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    Show time..

    James One of the things that happens when you bend stainless is that it work hardens immediately along the bend as the metal is stretched. We have a fairly good rotary type die bender and the first time I bent a piece of SS tubing I was shocked at the even ripples on the inside of the bend...
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    geo metro motor

    Rehan Yes, the K series Suzuki Turbo's are VERY impressive. We don't yet have any of the 1.0L engines Stateside, but we have already converted the smaller 660cc K6A that came stock in the Arctic Cat snowmobiles here. An easy 500+ lbs. of static thrust and very compact. There are photos of one...
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    look what is comig to fight rotax

    Paul and Mark The major Rotax® vendors at Oshkosh were clearancing out the Rotax 503's that they had in stock and told me that it was out of production. There are still numerous Geo 3 cylinder engines available. The great part is that for this conversion we only need the long block with...
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    50mm wide 8mm Kevlar Cogbelt

    Would advise against any tensioning system that is spring loaded. It could easily allow the belt to ramp up onto the teeth of the sprocket under heavy load or torsionals and destroy itself. There is no significant problem with a backside idler as long as its diameter is at least as large as...
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    Anything new on Yamaha conversions?

    Gyro Jockey Gerg Just back from a road trip. No offense taken on your commentaries to my posts. As I said, there's no need to reinvent the wheel, but you do need to get the right info. A couple pieces of useful belt drive info that apply to toothed HTD type belts: *There is no dampening...
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    Anything new on Yamaha conversions?

    Gyro Jockey Gerg Sorry that you apparently weren't able to grasp my cautionary notes on attempting to adapt a CVT to a prop. Please keep others well away from the sides of your craft as you engage full throttle cause if the CVT does upshift on you, as I expect it will, it will sling a prop...
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    Anything new on Yamaha conversions?

    Gyro Jockey Gerg Only said we had looked into the CVT as a redrive. The testing described earlier was to illustrate the lack of lock up of our fixed ratio belt redrive hooked to a prop. When you have a CVT hooked to a snowmobile or off road vehicle, as we did when we went through extensive...
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    Anything new on Yamaha conversions?

    Gerg Must confess to having those same thoughts in my early days about using a CVT belt drive coupled to an inflight adjustable propeller. The physics just don't work well for an aircraft application once you study the principles of what a CVT actually does. The other problem is the huge...
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    Anything new on Yamaha conversions?

    Tony If I remember correctly you were one of the pioneers in promoting the Suburu engine conversions years ago. If so, your and Don Parnam's efforts to promote the viability of auto engine conversions was greatly appreciated. I second your point regarding the value of flywheel mass in working...
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    Anything new on Yamaha conversions?

    Thanks for sharing your experience with the kevlar 50mm wide toothed belt. It would require much more detailed information to begin to determine the possible causes of your failure. Belt tension, the position of your idler on the slack side, seperation and diameter of sprockets, prop mass and...
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    Anything new on Yamaha conversions?

    The U- tube video shows a quick and dirty test bed, mounted on a Geo Metro of course- for confirming that the Geo 1.0L direct drive would run even or better than a 1/2 VW with the same prop. We hauled it to Copperstate Airshow a few years ago so we could do test run ups near sea level rather...
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    ??? torsional resonance ???

    torsional resonance torsional resonance 15 years ago Mr. Hessenaur was key to the success of our Geo/Suzuki engine development. I was fortunate enough to be able to spend an afternoon with him discussing the unique problems of torsional resonance that all eight groups developing the 3...
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    Arctic cat T660

    Jason Thanks for the clarification on the RK-400. You didn't mention whether you were flying a gyro or a fixed wing. If you were flying a gyro- there would be much less noticable drag change since with our rotorcraft we are already in the most draggy category of anything typically flying. Just...
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    Arctic cat T660

    Brent Assume you are referring to the RK400 clutch unit that can be retrofitted to the Rotax box. We nixed decoupling redrive from engine as a viable option for handling torsionals as you end up popping a significant small parachute (in the form of a windmilling prop) in the event of an engine...
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    Arctic cat T660

    Arctic Cat 660T Arctic Cat 660T Jason Hop up on the great build out pages for the Yamaha conversion to see all the fine quality (but complex) parts that were required to adapt the C box to the sled engine which has limited structural attach points. The Suzuki 660T engine originated in the...
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    Arctic cat T660

    Brent Haven’t checked yet to see if the taper is the same- I’m hoping that it is. The big advantage of the Artic Cat engine is a real bell housing with solid attach points. For and aft spacing may be an issue as well as the Rotax has no flywheel before the taper. For the Geo 1.0/1.3 we would...
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    Arctic cat T660

    Arctic Cat 660T Arctic Cat 660T Brent After spending last week at Sun-n-Fun airshow and getting feedback from a lot of great folks at our Seminars there on both our Rotor-Plane and our Geo/Suzuki auto engine conversions, we have decided to tool up for adapters to fit the Rotax C gearbox to...
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