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Search took 0.00 seconds. Search: Posts Made By: Jon Fuller
Forum: General Boating Discussion 02-10-2009, 11:50 AM
Replies: 54
Views: 8,245
Posted By Jon Fuller
I'm not qualified to comment, as I haven't driven...

I'm not qualified to comment, as I haven't driven either model.

However, I know Steve Baker considers the later P23 to be the best design he did, and he thinks it would out perform a 25 in the...
Forum: General Boating Discussion 02-10-2009, 09:19 AM
Replies: 54
Views: 8,245
Posted By Jon Fuller
The twin efi P23 was put together by Neil Holmes...

The twin efi P23 was put together by Neil Holmes for a customer (John Evans?), though it started life as a single. I think it did around the 100mph mark. And yes, it is indeed the one now owned by...
Forum: General Boating Discussion 30-09-2009, 07:37 PM
Replies: 54
Views: 8,245
Posted By Jon Fuller
Who?

Who?
Forum: General Boating Discussion 30-09-2009, 06:38 PM
Replies: 54
Views: 8,245
Posted By Jon Fuller
Complex math I would think. Do such things...

Complex math I would think.

Do such things exist on rotary stuff? ie, do they exist on props, or heli blades? I've only seen em on wings used in a linear vibe, not rotary.

As far as...
Forum: General Boating Discussion 30-09-2009, 05:34 PM
Replies: 54
Views: 8,245
Posted By Jon Fuller
I was also under the impression that the best of...

I was also under the impression that the best of the pure cleavers (Super cavitating) props, having got the process going at speed, literally chop (cleave) the gobs of water, leaving the forward face...
Forum: General Boating Discussion 30-09-2009, 05:16 PM
Replies: 54
Views: 8,245
Posted By Jon Fuller
I've always understood (maybe wrongly) that...

I've always understood (maybe wrongly) that supercavitating blades don't attempt to fly (as in 'foil') through the water (as in a regular screw) but quite literally slice off chunks of passing water,...
Forum: General Boating Discussion 30-09-2009, 04:08 PM
Replies: 54
Views: 8,245
Posted By Jon Fuller
Dunno about that, though I have heard the theory....

Dunno about that, though I have heard the theory. Surely that would mean the maximum thrust you could achieve would be prop area x absolute vacuum? Absolute vacuum can't be much more than -1...
Forum: General Boating Discussion 30-09-2009, 01:04 PM
Replies: 54
Views: 8,245
Posted By Jon Fuller
But 'in theory', at least as far as I can...

But 'in theory', at least as far as I can understand it, the high rake prop will only really give this effect if running high, so that the lower blades can exhert their effect during the lower 180...
Forum: General Boating Discussion 30-09-2009, 08:59 AM
Replies: 54
Views: 8,245
Posted By Jon Fuller
Yeah, I understood the same, certainly with a...

Yeah, I understood the same, certainly with a light efficient boat.

However, with this 'Witchcraft', we see multi blade props, such as the Merc Maximus (5 blade) that are apparently super fast....
Forum: General Boating Discussion 29-09-2009, 06:44 PM
Replies: 54
Views: 8,245
Posted By Jon Fuller
Will do. :up:

Will do. :up:
Forum: General Boating Discussion 29-09-2009, 06:37 PM
Replies: 54
Views: 8,245
Posted By Jon Fuller
Interestingly, I have Bravo1-30's and Mirage...

Interestingly, I have Bravo1-30's and Mirage Plus-29's for my 28.

One would assume the Mirages would require higher rpm's to achieve the same speed as the Bravo's, but in reality, the boat is a...
Forum: General Boating Discussion 29-09-2009, 06:24 PM
Replies: 54
Views: 8,245
Posted By Jon Fuller
That equates to a very good slip figure (< 10%) ...

That equates to a very good slip figure (< 10%)

What are you using to measure the speed?

I calculate that 10% slip, on the 25's @ 7500rpm would give you 85.4mph (this obviously assumes...
Forum: General Boating Discussion 29-09-2009, 03:45 PM
Replies: 54
Views: 8,245
Posted By Jon Fuller
I remember chatting with Steve some time ago, and...

I remember chatting with Steve some time ago, and he reckoned that a P25 set up right with the 192hp XR2's 'should' run 80 or more, I guess your figures based on XR2-162's backs that up.

As for...
Forum: General Boating Discussion 29-09-2009, 03:00 PM
Replies: 54
Views: 8,245
Posted By Jon Fuller
Mid 70's seems horribly off the pace with that...

Mid 70's seems horribly off the pace with that kind of power. Those 25's (albeit lighter ones) ran mid 70's with XR2's @ 200hp.
I think a lot of the 4 litre P25's ran cleavers, which on face value...
Forum: General Boating Discussion 29-09-2009, 08:40 AM
Replies: 54
Views: 8,245
Posted By Jon Fuller
That's it, you're banned!

That's it, you're banned!
Forum: General Boating Discussion 29-09-2009, 08:31 AM
Replies: 54
Views: 8,245
Posted By Jon Fuller
Toffen, I would persevere with props etc before I...

Toffen, I would persevere with props etc before I started cutting a perfectly good boat around. It would be a shame to upset the handling.
I think your boat wasn't built particularly light, so...
Forum: General Boating Discussion 28-09-2009, 12:30 PM
Replies: 54
Views: 8,245
Posted By Jon Fuller
No, the 23 doesn't have a notched transom. ...

No, the 23 doesn't have a notched transom.

As with all the later Baker designs, it has a pad keel that 'morphs' out of the inner most spray rails running aft.

We added a notch to the Extreme 26...
Showing results 1 to 17 of 17

 

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