Recent content by GTX_Engines

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...

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...

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...

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...

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.

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

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...

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...

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...

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.

Mohawk Aero has a variety of gearbox options, as well as clutch and no clutch. They always have, and they always will, since 2012. These are now available to work with RX1, Apex, Phazer, Nytro, Attak, Vector, Rage, Mountain...in other words ALL Yamaha Genesis (YG) engines. In some cases, such...

Take a look at this dyno chart provided by an aftermarket group. I don't believe their reported numbers showing the huge increase in power when their product is installed, but at least this gives us a pretty good idea of what's going on with the power at any given SPRM. For CRPM multiply the...

There may be some misconception about Yamaha conversion engines here. ALL YG2 and YG3 engines must have a clutch to start the motor, since it won't rev through to a smooth idle when hard coupled to a prop. It's like trying to start a bike while in gear. Next, there is no need to use a...

Here are two other threads that are suitable for the new "YAMAHA" category: First 160 HP Yamaha EXUP aircraft yamaha-160-hp-stock-170lbs-installed

It is wonderful to see Yamaha Genesis engines have now been provided their own category here on HBA. Thank you. HISTORY Pretty sure this is your first thread on the subject. First mention of Yamaha on Homebuiltairplanes The thread above was posted 10/9/2010. I found the HBA forum and that...