The Atomic 4 has less torque than the engine Wm. Atkin specified, which
I'll bet was a Gray Sea Scout, so you'll have to spin the Universal faster
to get the same performance. I have specs from 1946 that show the "Lugger"
series Sea Scout put out 25 hp. at 2000 rpm. The specs I have for Atomic
4s show that the UJ, UJR and UJVD models put out 16.2 hp. at 2000 rpm, 20
hp. at 2500 rpm and 25 hp. at 3000 rpm. The UJS and UJSR models top out at
18 hp. at 2500 rpm. With a propeller that'll let it spin up enough, a
direct drive UJ Atomic 4 should work fine in a Rescue Minor, and it'd be a
lot more pleasant than a diesel.
On Wed, 21 Jul 2010 14:16:08 -0700, Rob wrote:
> I am in the early stages of building a Rescue Minor. Atkin specifies
> a 91ci, 340 lb gas engine and a 10" dia x 12" pitch prop. He expects 17
> 1/2 mph @ 2000 rpm.
> This sounds like a good fit for a direct drive Atomic 4. Any reason why
> I have a late-model direct drive motor I could overhaul and upgrade and
> I'm kind of fond of these things anyway...Quiet, well balanced,
> dependable and kind of an anachronism in marine power.
> A diesel doesn't appeal to me.
> See any downside to this match?
Let us enrich ourselves with our mutual differences. (Paul Valery)