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  1. GTX_Engines

    Phazer Build

    I agree, Marc! I've been flying a stock, 145HP Yamaha Genesis RX1 which weighs about 160-170 lbs installed since 2012, lol. And when all was said and done it cost me but $600 for the engine with 2000 miles on it, just enough to break in the rings and bearings. Most people recognize it as...
  2. GTX_Engines

    Phazer Build

    The length of the pipes from flange to the top crotch of the header needs to be 21-22 inches, measured through the middle of each curve. No shorter, no longer. Length is determined by the shock wave distance traveled during the cycle of the valve opening and closing. The slower the engine is...
  3. GTX_Engines

    Free-blowing a bulged bubble canopy?

    I used to make rocket style gumball machines from scratch in the '90's. Drape molding acrylic sheet is simple, and can be accomplished with nothing more than a "salamander" kerosene space heater. Just put the plastic in the hot air stream and let it drape over a cylinder. Cylinders for...
  4. GTX_Engines

    Phazer Build

    Please allow me to express a few thoughts on this product and post without being perceived as going on the attack or being prickly and argumentative. I'm just trying to provide some good info that is not just plain reliable, it is first-hand (not rumor) and mostly common sense. I have been...
  5. GTX_Engines

    Phazer Build

    With many of the Skytrax tractor FW installations I've noticed that an additional prop flange spacer is required to clear the cowl. Does yours?
  6. GTX_Engines

    Yamaha Apex internal gear reduction.

    The engine idles smooth w/o a clutch. It accelerates the same with or without a clutch. A clutch is used only to make initialy start-up smooth, or in the case of a centrifugal clutch to allow the engine to idle w/o prop thrust on the water. W/o a clutch, as you turn on the key you need to...
  7. GTX_Engines

    Yamaha Apex internal gear reduction.

    Again: No.
  8. GTX_Engines

    Phazer Build

    Without "advertising", you'll find that the Skytrax "All-In-One" is great for most tractor aircraft, but on most pushers it works better to use a conventional gearbox and flip it upside down. Like the Quicksilver float plane we helped with the Phazer conversion early 2019 - the first...
  9. GTX_Engines

    Yamaha Apex internal gear reduction.

    No.
  10. GTX_Engines

    Kitfox I, II, III & IV Yamaha 80 HP FWF Frame!

    MohawkAero.com, having engaged Dean Carboni, who used to weld Team Penski et.al. NASCAR chromoly frames for a living, is now fabricating Kitfox III ( fits all early model Kitfox, from what I've been told) frames to convert from 65HP Rotax 582 to 85HP Yamaha Phazer YG2 4-stroke, 2-cyl...
  11. GTX_Engines

    Psru bellhousing

    Are you planning on installing a Subaru? If you don't already have one I would advise against starting out from scratch with one. They weigh twice as much as other much more modern conversions such as Yamaha with a relatively poor service record compared to them. I have a fleet of dozens of...
  12. GTX_Engines

    Alternative to turnbuckles

    Nice thread, I was just looking at turnbuckle prices from Aircraft Spruce, Grainger, and Fastenal this week. They all cost $35.00 each, so I was wondering what other guys are doing where these are needed. I like Mike's post #5 and the photo ! Here is just one source found for high carbon...
  13. GTX_Engines

    Best Gear Oil?

    He builds the gearboxes, you build the aircraft. How many different applications and engine-gearbox combos can you imagine for the use of a rather generic gearbox, that might have nothing new but the housing to attach to a particular motor you want to run it on? Not possible for the gearbox...
  14. GTX_Engines

    Best Gear Oil?

    Very interesting stuff. We don't get into the higher HP stuff, but our Yamaha conversions are still pushing the gearboxes we typically use. Whine is something I've noticed in a number of new builds (sounds like a super charger) but it always goes away after break in. So in our case it is...
  15. GTX_Engines

    Selling 3-bladed carbon fiber propeller

    I sent you an email requesting price list for props and adjustable pitch hub. We fabricate and sell Yamaha 4-cycle aircraft engine conversions, 80 HP to 175 HP. Looking forward to hearing from you soon.
  16. GTX_Engines

    $10 gallon Avgas

    This paper dated 2018 states that 100LL contains 0.13% Tetra ethyl lead. I think the facts stated are from 2013. MSDS for Phillips 100LL
  17. GTX_Engines

    $10 gallon Avgas

    Simple question: Does lead decrease volatility to the point where leaded fuel will not vapor lock as easily as does recreational pure gasoline? I say no, and have a BS in chemistry. My wife has a PhD in chemistry and she agrees with me. We agree that changing a metallic content in a volatile...
  18. GTX_Engines

    Crashes in the News - Thread

    A good friend died Friday night in Indiana in the hospital after succumbing to burns suffered from a chash while testing one of his latest Brantley helo rebuilds. This is what he did for most of his later life, and it comes as a shock to all of us in the PRA. He was the best Brantley rebuilder...
  19. GTX_Engines

    The Prop windmilling on RX1/Apex engines

    Gyrocopters are in autorotation at all times. Helicopters are not. When a helo engine quits, the helicopter must have at least 45 MPH foward true AS in order to autorotate and glide to a safe landing. This requires a minimum 200' AGL from a hover, zero AS. Since a gyrocopter is ALWAYS in...
  20. GTX_Engines

    The Prop windmilling on RX1/Apex engines

    YOU DO NOT NEED TO HAVE A CLUTCHED PROP ON A YAMAHA RX1 OR APEX. If you are concerned with best glide flight, then don't use a clutch.
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