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  1. NoWingsAttached

    The "Nine O Nine" B-17 crashed

    I am deeply saddend by the loss of life and total destruction of aircraft yesterday. I wrote on this forum about four years ago that I had just enjoyed an exhilarating experience off the coast of Savanna flying "in formation" with a B-17, known as the "Nine O Nine", for a short distance as...
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    First 165HP Yamaha EXUP Aircraft Build

    Photos of progress on Geoff Resney's Air Command tendem, formerly a Subaru powered gyro. This is the first ever Yamaha Genesis 4-cylinder (YG4) 165HP EXUP aircraft. Yet another AC Yamaha pioneering project. Chris Toevs, et. al., was lamenting that missing from RF these days are the detailed...
  3. NoWingsAttached

    Considering the Rotax 915

    FYI: Rotax builds great engines, no argument there. I always wanted one, but could never come to grips with the cost. The latest and greatest is the 915. It puts out 140HP up to 15,000 ft. by finally getting on board with what I...
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    Mentone - Are you going? POLL

    There are two new Yamaha conversions coming to Mentone this year - my first visit since 2015, when I showcased the Silent Drive with prop strike protection clutch for Yamaha engines. These two motors will be available for folks to inspect, and detailed information will be made available. The...
  5. NoWingsAttached

    Yamaha WEIGHTS - MAC YG2!! 80HP Phazer 4-strk, 2-cyl, EFI, 88/123 lbs, liq-cool

    It's HERE!!! Remember back in 2011 when Ernie tried to do a successful YG4 (Yamaha Genesis 4-cylinder 4-strk 150HP) conversion and ran into so much trouble and headache he abandoned it and never did another one? Remember when I did a YG4 right after it, and it was trouble-free right out of the...
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    MAC Yamaha 80-85 HP 2-cyl 4-cycle kit: Flying Video

    MAC customer in New Orleans could not wait to finish his exhaust before he took off in his Quicksilver floatplane to test it out and see how much it beats the boots off Rotax 582. Someone once wrote on RF that these engines didn't work, they had tried and failed and everyone should just forget...
  7. NoWingsAttached

    Why I Am Not At Bensen Days 2019

    I promised a bunch of people I would show up at Bensen Days this year. Here's why I did not go.
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    Chris Lord October 31, 2018

    Rest in Peace. Respectfully wondering what happened. There is a donation link for his surviving wife and young children here:
  9. NoWingsAttached

    Barry Days Invitational

    Barry Kroplin's October invitational (RSVP not requested) was as enjoyable as ever! Where else can you find everything from an open stick frame Gyro Bee to a eurotub AR-1, and everything else in between? Air Command, RFD, Avio Mania, Snobird were just a few of the recognizable mfg to be found...
  10. NoWingsAttached

    1939 Sikorski VS-300 Museum Photos

    While up in Michigan for my 46th High School reunion in Northville, (the rather unusual year is due to a combining of multiple classes, but I think the best represented class in attendance is my gang from '72) this weekend, I was killing time yesterday visiting the Henry Ford Museum in Dearborn...
  11. NoWingsAttached


    Start with a typical pusher gyroplane with a fixed prop position, fore/aft placement and height of thrust line. No changes to the airframe nor head placement allowed. You have two options: the engine can be placed with its COM (A) at or near the prop thrustline, or (B) 3 inches below the prop...
  12. NoWingsAttached

    Oshkosh ’18 LSA Grand Champion powered by YAMAHA YG4i

    Steve Henry was my first customer in 2013. Then, in 2017 he wanted one of my latest Mohawk Aero Corps (MAC) Yamaha YG4i gearbox adapters for the 150 HP Apex snowmobile engines which, unlike the earlier RX1 motors, has EFI - something that high-altitude pilots love for obvious reasons. He had...
  13. NoWingsAttached

    Rotor Bearing Life: Calculate Yours!

    Attached is the "Bearing Life Wksht II.xls", an interactive worksheet which calculates your rotorhead bearing's life with your input of flying weight, rotor speed (RRPM) and your bearing's "Cr" spec as found in the manufacturer's data sheet. I embedded an image of it below so you can see some...
  14. NoWingsAttached

    YAMAHA Gearbox: Options & Bearing Life Data

    Attached is the data sheet for ball bearing life, 90% expectancy to last as long as shown. Two sizes are listed side-by-side: First, the 25 mm ID 6205 used in the Rotax C - the only PSRU that can be fitted to a Skytrax adapter, for YG4/ RX1 engines only. Gear tooth angle of contact has...
  15. NoWingsAttached

    The Yamaha Pre-Rotator Advantage: Rear Engine PTO!

    Mohawk Aero, being firmly rooted in gyroplanes, has always kept an eye to rotorcraft-specific engineering and design. One example is the Silent Drive which incorporates PTO mounts in the PSRU housing, eliminating excess weight, time and cost investment in the hardware necessary to mount the...
  16. NoWingsAttached

    Smartphone BOROSCOPE $50 - taking Orders now

    Check this out: This showed up on my Facebook page today. Anyone interested, let me know. If we order in three's the price drops from $77.00 each (S/H included) to $57.00 each (S/H Incl.) Let me know if you want to batch order with others, by emailing [email protected] I will wait to...
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    Peachstate Rotorcraft Club (PRC) Annual Cookout July 15

    PRC will be hosting its fifth annual summer cookout July 15th at 4A4 Polk County Airport in Cedartown, GA. The club supplies the burgers 'n dogs while encouraging folks to bring a dish to share on the buffet table. Typical attendance is ~75, which keeps growing every year. Lots of gyros are...
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    Kitty Hawk Flyer - electric Rotorcraft is here!

    So I was watching a Youtube of Gerald's, to take a break from doing (ugh) taxes, of a cool Dominator with a Suzuki water buffalo motor on it. (We've been calling them that since the '70's, old habits die hard) On the side I saw a link for this Kitty Hawk Flyer just posted June 10, 2017. That...
  19. NoWingsAttached

    Mohawk Arrow - a new USA-Built Enclosed/Convertible Gyroplane

    Fresh out of the mold! Here is the first fuselage and a couple of renderings of what it is going to look like with the plexiglass canopy, which is removable and replaced with a windshield for sun-n-fun fair weather flying. This is to be the world's first aircraft, of any type, designed around...
  20. NoWingsAttached

    Rotax C Hardy Disk failure on Yamaha YG4

    My R&D test friend #2 was running a YG4 with a Rotax C box on FW. He flew about 185hrs, half with an RK400 clutch and half with the stock Rotax C hardy disk rubber flex shaft coupling. He decided to put the RK400 back in it this morning while waiting for delivery (going out in today's USPS) of...