old vs new Speedmaster 21

[jackool]

How does the old differ from the new Speedmaster 21 in terms of performance because the new has a completely

modified hull and deck? ???

 

[Joe Knesek]

The new hull runs much flatter on the water than the old hull. I ran the new hull at the Internats and it never blew off or dumped when many of the old Speedmasters did. I was also able to run more prop than the others.

 

[Chris Cohea]

Sure would like to see a pic of this new hull... ;D

Does if differ from the older version much???? ???

 

[Joe Knesek]

The boat has a new deck and the bottom only has a strake that only runs half way done the bottom.

View attachment 163

 

[jackool]

Thanks Joe. You've got such a beauty there with that Mac 21. What pitch of prop did you use ? Do you run your boat with a turn fin?

 

[Joe Knesek]

I ran a 440/3 stock pitch. I built the boat with the inside tabs only. no Turn fin.

View attachment 164

 

[ClayGlover]

hey joe, i see you got a first place in one of the heats. CONGRATS! ;D you must have a quick boat to manage that at the 'nats. then again, monos are a "drivin man's class", so you must be a hell of a driver too. i went to the 2000 nats and 20 mono was a fiercely competetive class! what carb and remote needle is that? a D&J? any performance change over stock? and that pipe, it's an anodized Brown pipe right?

 

[jackool]

Thanks again Joe thought set up would be different from the older Speedmasters because of the completely new hull.

I see there's just a hull between us cause I have boat #106. ;D

 

[Joe Knesek]

Clay, I don't know what performance the D&J gave me over the stock carb because the boat had not been ran until the Internats. It throttles well and that's why I used it. The D&J from a Nova Rossi will fit the MAC.

 

[jackool]

Joe is the D&J an 8, 9, or 10 mm carb? Thanks.

 

[Joe Knesek]

It's .339 inches.

 

[Ian Inverarity]

I love neat boats, and neat layouts. And THAT is neat! ;D

Very nice Joe!

Ian.