I picked this Webra .91 ringed engine up from the RCU MarketPlace, it's in excellent condition, I clocked it at 10,240 rpm with an APC 14x6 and Fox 5% nitro fuel with 20% castor. That makes it about 300 rpm stronger than the AB? .91 I've had for about 10 years. The Davis SoundMaster is good for about 200 extra rpm in most cases, I'll have to try it on the AB? one and see what happens.

And you are not afraid its going to move that limestone cap block you have it clamped to?

I sure hope not, I already got in trouble for burning moving boxes in the thing and turning the bricks black, I was aiming to run the Saito 2.20 there today but it started raining about the time I shut down the Webra. I would like to clamp the test stand down to the other side the the fireplace but that would oil up the chimney, where you see it I just oil up a Polkberry bush but its awkward to work from that side.

I doubt if your wife will complain about the poke berry bush? There's a mess of the Polk Berries near our flying field.