Recent content by sotaro

I thought Columban did not sell plans for construction in the U.S. Do these plans precede that decision or were they sold in another English speaking country?

Would love to see your build blog when you can.

Yamaha Apex is about 170 lbs complete, with oil, radiator, exhaust, electric start, EFI gear reduction ready to run with more than 100 hp. Turbo versions are flying with much more power...The Yamaha Phaser is about 135 lbs same as above, ready to fly, 80 hp. The Apex has about a dozen flying...

@Geraldc Mr. Parker, nor anyone else, in the articles I have read, mentioned John Britten as the designer.

No, not Britten, James Parker with the RATZ which was a Rational Advanced Design Development (RADD) using a TZ 250 Yamaha race engine. Oct 1995 in Sport Rider, though I am sure it is in other magazines. The air cooling ducts went from the front of the fairing (near the headlights) to the...

Some race motorcycle designer tried a meredith style cooling system about 25 years ago. The bike had many interesting features. I never saw it again.

Couldn't find the group, alas. Verner uses heads from a major Japanese manufacturer (I believe to be Honda) in their radials.

Mr. Halvorson seems to be a very accomplished engine modifier. https://www.hotrod.com/articles/see-video-of-a-top-fuel-hemi-converted-to-burn-diesel/

While the Subaru heads are attractive, there are so many engines of the 500-1500cc range that makes building one seem to be an extraordinary investment of time and energy. The 500cc Yamaha Phazer snowmobile engine is in the 70 hp/130 lb range. Liquid cooled with a PSRU, it really only requires...

Addicted, could you keep us appraised as to your thoughts and progress in this area? would love to learn more of the joys of radial engine design and construction. I am not a fan of the flat head, but it would be interesting to see of it's advantages and disadvantages. Seems like the joys of VW...

I remember reading the car magazines when it was introduced. They mentioned putting it in their luggage. I don't remember carry on. I am pretty sure the block was 88 lbs, as I remember. Memory being a fickle thing, you might want to investigate further.

Doggzilla, if you are thinking of crankcase compression spark ignited gasoline two strokes that are still to be found on various consumer products, they don't have poppet valves as in 4 stroke cars and such. They have ports, perhaps moveable "power valves" that reduce exhaust port height to...

Actually, I don't think there are any turbos that would work for a 170cc engine, at least not in an efficient range.

I found it is a 4 valve per cylinder, aluminum block and head and 15:1 compression ratio and it has an intercooler. Sounds nice...

Bienvenidos Marcos, En que parte de Espana esta viviendo? Yo vivo en San Francisco. Hay sabios aquí. Jiro