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Terry, try changing the pipe length or better still change to a different pipe but keep plug to start of stinger the same length then see if the dip is still there or moved to a different rpm. That way you will know if it is a problem in the drivetrain. My experience is that it is all in the...

Terry, Take care with your automatic needle setting vs EGT. As soon as an engine starts detonating the EGT drops and your system may well lean it out more, and then BOOM.

In Europe virtually all racing surface drive monos 3.5cc and 7.5cc use gearboxes for the simple reason that they are faster than direct drive in the oval races here. The bigger props are more efficient and give better bite in the rougher conditions that we often race in here with up to 10...

On nitro engines.... 1. On a rigger the pipe is being cooled by the airflow as you go faster. That is just what you do not want.  2. Pipe design. In general,  a short steep angled rear cone will cut off the power after peak. A shallow rear cone angle will allow more over-rev. On gas...

Yes to both. 

Terry,  When your boat is running at it's maximum speed it is well past the rpm point of peak hp. 

Better peak hp and most important over-rev. but trying to maintain a decent torque curve at the same time . 

I have not used a one way bearing on either of these dynos. At first I would blip the throttle when the flywheel was slowing down after a run, but in practice the flywheel disengaged pretty quickly. If there is a brake on the flywheel then it can be slowed very quickly. One of those things where...

Andy, I have conrods for that motor http://www.prestwich.ndirect.co.uk/OSengines.htm

Terry.I have a TM7

RIP Boris, a true innovator.

Boris, I will just have to suck it up. Please let me know the total and your PP address.

Boris, I would like to buy a flowmeter shipped to UK.

I had most success with the ignition at set at 1.2mm BTDC.

Terry, GPS the telemetry rx and gps unit is too big for the 3.5 rigger and mono

Terry, I run normally with rpm and speed telemetry using the Multiplex radio but not logged, just max speed, actual speed and rpm on the screen.

Stalker it is then

Is the Bushnell 101911 radar gun any good for rc boats?

WTB. Zoom carb for Novarossi 21 and CMB21 Beta

Did a search and found the info I needed