Engines (back to basic)

Engines are constantly at the back of my head these days. To be able to run on Avgas UL91 seems to be a "must" judging by how things are developing. The ability to run on mogas becomes less important.

I have narrowed it down to VW engines. I have to mount the engine in the aircraft within a reasonable time. I have also included carb, double ignition, exhaust etc in the price. The list looks like this:

Name	Type	HP(max)	RPM(max)	cc	kg	Price €	TBO [H]	UL91	Mogas
Revmaster	2300	85	3200	2331	77	€ 5 975	1 200	TBD	98*
Hummel	2400	85	3400	2387	76	€ 5 380	0	Y	98*
AeroVee	2.1	80	3400	2180	73	€ 5 372	0	Y	98*
Great Plains	2300	80	3600	2276	75	€ 5 907	0	Y	98*
Sauer	2200 UL	85	3000	2234	66	€ 10 506	1 600	Y	98
Sauer	2400 UL	100	3500	2332	75	€ 11 442	1 600	Y	95

Revmaster
Pro: Overall excellent quality, TBO, HP, highly recommended by people I have contacted who are using it
Con: Will it run on UL91? That is being tested at this moment.

Hummel
Pro: Largest capacity (2387cc, almost 10% more than AeroVee), HP, UL91
Con: Rather unknown to me, and the website is almost void of info. TBO = 0

AeroVee
Pro: Supported by Sonex, easiest way to get flying, Prop, baffling and everything else fits 100%, UL91, the macho factor of flying around with an engine I have put together myself.
Con: Smallest capacity, HP? TBO = 0, the anxiety factor of flying around with an engine I have put together myself.

GP
Pro: Old and respected company, UL91
Con: Extremely High RPM, TBO = 0

Sauer
Pro: Overall the best engine, HP, Support, TBO, UL91, mogas
Con: Price, probably the most difficult to fit onto the airframe ?


The most desirable is Sauer. Then the Revmaster, more or less a less costly Sauer. I really hope it runs on Avgas UL91. The AeroVee is probably the engine that makes most sense to install, everything considered. The Hummel is the joker of the bunch.