Diesel aviation engines

[310]

correction to previous post

According to zoche's and sma's webites the sfc of their engines is better even than I posted before. At cruise power zoche claims a sfc of .346 lbs per hour/horsepower and sma claims 215 gr/kwh average which converts to .353 lbs per hour/hp. (1 kwh = 1.341 hp) ( 1 lb is 453.59 grams)

These sfc are not possible in a 100LL as far as I know.

 

[sstearns2]

EJ-22 and zoche engines

Hello all,

The EJ-22 is an interesting engine. Williams developed it beause NASA gave them a tremendous amount of money. They claim a weight of 85 pounds, but they put everything possible under airframe weight. Things like fuel pumps, hyd pumps, stater/gens, etc. As far as efficiency and price are concerned, we'll just have to wait and see. I hope they can make it happen, but I think they told NASA whatever they wanted to hear to keep the cash flowing.

I'm sceptical of Zoche's claims. They've been working on thier engines for many years and have yet to actually sell an engine. Certification seems to always be 'about a year away'. I want to make a webpage about my new tubro-stearns cycle engine that makes 300 HP at 7 gallons/hour and see how many deposits I can get.

Scott