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  1. R

    Reduction drives

    redives Yesterday I visited with the mechanic who is restoring my Citabria. He also performs maintenance on some police department Enstrom helicopters. The Enstrom uses a poly V belt drive for the primary gear reduction and clutch system. The belt is about seven inches wide and forty eight...
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    Reduction drives

    redrive controversy At Oshkosh in 2002 NASA presented a forum on the status of their General Aviation Power (GAP) program that they studied in collaboration with Teledyne Continental Motors(TCM). The forum discussion became lively and heated because NASA's Mark Moore and Andrew Hahn concluded...
  3. R

    Reduction drives

    redrive info there is a periodical called "Contact!" that is devoted to alternative engines and back issues are available. The magazines are loaded with real experience information and all back issues are available. To date they are up to issue 73. They can be contacted at...
  4. R

    Reduction drives

    redives Yes, I agree with the point about shifting gears. That will not contribute to the performance. The variable pitch prop is our gear change method and it works very well and is quite simple. My "second gear" comment was a flippant remark made in jest. I do think however the CVT...
  5. R

    1/2 Lb per HP

    engine concepts Orion makes a good point. The only new engine concept , other than turbine, that was made into a viable commercial product during the whole of the 20th century is the Wankel rotary. There have been hundreds of schemes in the past hundred years and so far the reciprocating...
  6. R

    Designing to fly in Ground Effect

    WIGS Several years ago I saw a WIG being demonstrated at the Miami Boat Show. It was a nice looking craft that was obviously backed by some serious money. I believe it came out of Connecticut. At the time I was involved with marine marketing and as I had some personal interest I spoke with...
  7. R

    Reduction drives

    redrive The fastest piston airplane to date, Rare Bear, uses the largest prop possible turning at a speed that will keep the prop tips below the critical mach number and still be able to absorb the power available. Rare Bear runs with a Wright 3350. I di not know what the gear reduction is on...
  8. R

    Reduction drives

    belted redrive Several helicopters are using V belts and poly-V belts in their primary drive reduction and in most cases the belt drive functions as the power clutch. The ones that come to mind are: Enstrom, Robinson, Hughes. If those belts were absorbing 15% of the power I would think they...
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