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Interesting subject Lohring To me it would look like scavenging efficiency would be higher in a long stroke engine, then. Othewise I have always looked at the torque as being proportional with the stroke length, as half the stroke acts as the momentum arm for rotating the crankshaft, right...

In a mono I guess you need more torque than actual top end power compared to a hydro, caused by greater weight and wetted area causing more friction? With 4-cycle engines, longer stroke will give you more torque, but it is not that simple with 2-cycle from what I understand? So any suggestions...

I took the easier, cheaper and more practical way out and got hold of a 45 RS direct drive instead. I think the difference between the two cranks is the angular poisition of the machined connection to the disc. I would have thought it had been simpler to make the change on the disc, but there...

Most boom tubes seems to be made of CF nowadays. I know the material is lighter and stiffer than aluminium, but as a result of the stiffness it is also more prone to develope cracks. Especially with designs incorporating removable tubes, sponsons and adjustable AOA, there can be many sharp...

Thank's for the info guys. When, which year, did the RS get the new bigger crank pin?

I know the the cranks are different because of different front design and they have different part no. However the part no. for the the disc seems to be the same. I have never had a close look at the engine, but could it be as simple as turning the disc around, front/ back or is it the...

Hi Is there a simple way to reverse rotation on a CMB 45 RS gear version, to be able to use this engine on direct drive. Jan Erik

Intersting news The hull is however made of GRP/ epoxy. (may be CF reinforced) I thought the Roadrunners were all made of wood and the Hummingbirds of fiberglass/ carbon. Could this be a copy cat then? Anyway it's a nice looking boat, not like the anorexia looking modern riggers as some one on...

Thank's Wayne for info From what I understand Hummingbird is some what based on Road Runner. Is that wright? Regards Jan Erik

Thank's Ken Looking at the sponson design and relatively wide stance, the design does not look too old. The hull looks like it's made of GRF/ epoxy and the sponsons of wood, is that wright? Jan Erik

Anybody know the manufacturer of this "rigger". It is a .45, 36 inch long. Regards Jan Erik

John Oian designed a .21 OB rigger called Phoenix, in the late 70. He had an construction article in Model Airplane News followed up by several tuning articles. The boat was run with the only choice in those days, the 1. Gen. K&B with the short skeg. (had to use a separate rudder). Very fast...

Hi Paul Are you still making the Taipan 21 LX? Delivery time? Regards Jan Erik

I would very much like to be put on a waiting list for a new Lynx. How about payment? Regards jelys

Any more news of Lynx production? jelys

Taipan Hydros from www.highperformancemodels.com/comp.%20hydro.htm jelys

How about Grimracer's Ninja? Any availability or plans for the future? jelys

Thanks for all the good info guys. And Jerry, we are still talking about running outboards on tunnels. I don't think they are any good on a mono, because of the high CG. Just on the topic of gearing, I liked to mention the almost standard in Europe with 3.5 inboards on a gearbox in the mono...

I just wonder what makes the standard version of the TT inferior in performance to the OS? Looking at the specs in the adverts. Some says 1.6 hp and others 2.1 hp compared to OS 1.3 hp. I know one should not rely on advert but anyway. I am a newbie but my engineering background tells me you...

Over the years K&B must have made sleeves for the 3.5 with different timing. Thinking of the boat, car and plane versions. Some of you guys must have experience with trying out these sleeves on the outboard. Is it so that the standard sleeve in a 3.5 SS is the best option for a "stock" engine...