How fast?

Post Reply
tas
Posts: 68
Joined: Tue Dec 02, 2008 1:26 pm
Location: Sarf East London

How fast?

Post by tas » Wed Dec 10, 2008 12:09 am

How fast does K7 have to go to come out of the water and start planing?

Although I reckon a rebuilt K7 is still potentially the fastest boat ever, we all know she's not going to be doing 300+mph again. But what kind of speed can we expect to see in order to watch her as she was designed to move?
"He who goes to bed with an itchy bum, wakes up with a smelly finger"

User avatar
Renegadenemo
Posts: 4356
Joined: Mon Dec 01, 2008 12:29 pm
Location: N E England
Contact:

Re: How fast?

Post by Renegadenemo » Wed Dec 10, 2008 1:08 am

According to the Norris Bros. thrust / drag / speed curves the boat ought to climb out of the water at around 65mph using 2400lbs of thrust, which is good for more than 200mph once she unsticks. But that was in record breaking trim with a forward CoG so we can bring the planing speed down somewhat and limit the available engine thrust to keep her inside her safe operating envelope even at full throttle.
As for an estimated speed, that sort of depends on how she looks when planing. 100-ish, perhaps...
I'm only a plumber from Cannock...

"As to reward, my profession is its own reward;" Sherlock Holmes

Voltaire's apology when he wrote a long letter: "I didn't have time to make it shorter."

tas
Posts: 68
Joined: Tue Dec 02, 2008 1:26 pm
Location: Sarf East London

Re: How fast?

Post by tas » Wed Dec 10, 2008 9:42 pm

Cheers for the info, really cannot wait to see her running.

Shame she wasn't built as a 2 seater like thrust 2 - though she wouldn't look half as good - people would sell their grannies to have a ride in her!
"He who goes to bed with an itchy bum, wakes up with a smelly finger"

Post Reply