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  1. Air Trikes

    Current redrive options for Predator 670 project?

    I have one redrive in stock for industrial V-twin engines (Honda, B&S, Lifan etc) conversion. Well designed, well built. 7.3kg weight. 1.52 ratio. 185mm offset, Rotax type prop hub 47mm central boss, 75mm bolt circle. Can be used for aircraft, airboat, hovercraft, pusher and tractor. This drive...
  2. Air Trikes

    Parts Wanted Subaru ej22 reduction drive

    SPG-4 More info: Air Trikes: Engines and Conversion Kits.
  3. Air Trikes

    SDS EFI 30th Anniversary

    Have a Happy New Year Ross!
  4. Air Trikes

    Open Source PSRU Design -- Is it possible without personal liability to contributors?

    Yes, several of them are ordered, name or 2 customers is Chris.
  5. Air Trikes

    Open Source PSRU Design -- Is it possible without personal liability to contributors?

    Some pictures of SPG-5 350 HP gearbox kit for Subaru assembling. One more illustration - it is not easy to make "open source" gearbox.
  6. Air Trikes

    Open Source PSRU Design -- Is it possible without personal liability to contributors?

    I don't have 3-axes internal pictures because I don't sell 3-axes gearboxes. :) I posted the picture of one only to illustrate - they exist, I can order them if necessary. About SPG gearboxes, internal pictures and all steps of assembling pictures are available
  7. Air Trikes

    Open Source PSRU Design -- Is it possible without personal liability to contributors?

    No I don't have pictures of inside parts. I don't think there is something unusual inside. Gears, shafts, bearings. Yes, this (and other cast body) gearbox looks more solid than the gearbox with machined body. The reason is obvious. Thinner billet is cheaper + machining time and cost is less...
  8. Air Trikes

    Open Source PSRU Design -- Is it possible without personal liability to contributors?

    There are some design and marketing problems with 3-axes gearbox. 1) It has to be rigid to sustain prop loading without deformation. Gears don't like misalignments 2) Worse oiling of the upper gear 3) more elements means + 1) means it will be more beefy and heavier. 4) It will be more expensive...
  9. Air Trikes

    Open Source PSRU Design -- Is it possible without personal liability to contributors?

    I don't think somebody "hijacked the thread". If the moderator found something offensive in my honest remarque to Keith post, he can remove it and all related posts. I never said something about the quality of Aeromomentum or other gearboxes. Everything I said is true. I care and can talk about...
  10. Air Trikes

    Open Source PSRU Design -- Is it possible without personal liability to contributors?

    "Air trikes have shown their similar made in Russia gearbox" I presented this story for Kieth to correct his post a little. I would write "some american gearboxes looks similar to ones sold by Air Trikes more than 10 years ago. I also would not buy anything from China for my aircraft. I...
  11. Air Trikes

    Open Source PSRU Design -- Is it possible without personal liability to contributors?

    Ross, your comment is short, clear, right and exact as usually. I only can add you have to have specific experience in the gearbox production, or some money to hire specialists with such experience.
  12. Air Trikes

    Open Source PSRU Design -- Is it possible without personal liability to contributors?

    Dear Keith, I can tell you one story. Some years ago, Dragonfly airboat company purchased several AT-160 gearbox kits for their engine conversions from Air Trikes. They asked some guys in US to assemble G13BB engines for them. In about a year, I found one US company selling some gearboxes...
  13. Air Trikes

    Open Source PSRU Design -- Is it possible without personal liability to contributors?

    Noise is not JUST noise. Noise means low efficiency. Noise means the gearbox not only transmits the energy from powerplant to propeller but transmit the energy to sound waves (and heating). You lose the energy. Noisy transmissions are often overheated. Noisy transmissions have less life time...
  14. Air Trikes

    Parts For Sale Electric motor 25KW (34hp) with propeller and other components.

    1) Brushless motor 25KW (34hp) short, 17KW (23hp) constant, 100 V max, 5kg weight, with thermo sensor. 2000 USD 2) 2023T3 aluminum propeller shaft 6” 150mm 400 USD 3) Ground adjustable fiberglass 2-blade propeller 850 USD All together -30% = 2275 USD
  15. Air Trikes

    Open Source PSRU Design -- Is it possible without personal liability to contributors?

    All SPG systems have helical gears. The gearboxes are around 2000 USD, different ratios available. Internal parts available if somebody wants to play with his own gearbox design. 3.0 gearboxes and ready to bolt-on kits for Honda L and D are in stock. They are not 3 gears because more gears means...
  16. Air Trikes

    Parts For Sale Electric motor 25KW (34hp) with propeller and other components.

    You will need around 80KV motor if 24S (88v) battery and 31" prop used.
  17. Air Trikes

    Parts For Sale Electric motor 25KW (34hp) with propeller and other components.

    Hmmmm... interesting idea to have free-wheeling prop as an airbrake. Not sure it is doable with a folding prop. I would use a narrow blade instead for a soaring ultralight.
  18. Air Trikes

    Parts For Sale Electric motor 25KW (34hp) with propeller and other components.

    Contact me by Email about the prices. If you want a folding prop, you will need a controller with brake. I can supply one. This engine is OK for up to 60" diam props. If you want more, yes, the redrive can be used.
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