Haven't seen many reports for the small diesels so I'll post some numbers that I got today.
We only had around 5°C today and I preheated the engine to get it started more easily.

Engine is a PAW 55 (0.033 cui) BB RC with exhaust collector and it hasn't seen much fuel yet. Ran it today with graupner 7x4 with 30% castor in the fuel and got top revs around 7500rpm and an idle around 2800rpm, sweet sound!

I'm thinking of putting this in an Eastbourne 1913 for some relaxed flying....

Mr. Cox,
I've had a couple of these rc and with collector I remember getting 8,400 peaked with an apc 7x4 (I'll check my cheat sheets when I get home to confirm my memory)
Treven aka Chevy43 has what he calls his Magic PAW which spins the same prop nearing 10k[:'(] the ******* ! There seems to be a very wide range on these engines.

Ok, thanks for those numbers. People rarely seem to post numbers from their little diesels, yet I find it a little easier to tune using a tach...

The APC would rev up more easily than the graupner, so I might very well be on par with the "regular" performance then.

Here is what my note book says I got:

6x3.5 Cox 14,200

7x3 MAS 3,500-12,500

7x4 MAS 10,000

On a different "55":

7x4 MAS 3,500-9,900

7x3 MAS 3,500 - 11,100 Then with a 3" piece of exhaust tubing I got 3,200 - 11,200

8x3 MAS 2,500 -9,000

8x4 MAS 2,500 -8,000

Likes about 12" of exhaust tubing on the bigger props.

Runs about 20+ min on one oz. on the larger props.

Treven

If I didn't see it w/ my own eyes, I'd call baloney[:@]

Thanks for that complete table. That's some really good numbers for a 0.55cc engine!
Are you sure it's not an .049 ...?

Looks like I have some running to do on mine (at lower oil contents), I'll also put on a MAS next time for a better comparison.