Tunnel hull runners need your info
Moderators: bman, Chalk, Tom Keels
Tunnel hull runners need your info
What prop are you running?
Work 2 fish 4 days
1988 vintage 1436 Fisher Jon
1992 vintage 15 hp Merc
1988 vintage 1436 Fisher Jon
1992 vintage 15 hp Merc
- Chalk
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Re: Tunnel hull runners need your info
Did you check your RPMs yetRedbelly wrote:What prop are you running?
Re: Tunnel hull runners need your info
Chalk wrote:Did you check your RPMs yetRedbelly wrote:What prop are you running?
GULP! free since 1970.
I know, I know....but I can't find anyone with a gauge to put on it for a one time check. So I figure trying to go down from the pitch on the 3 blade I'm running now for a 4 blade.
Does anyone have or know of someone who has an RPM gauge I could borrow??
Does anyone have or know of someone who has an RPM gauge I could borrow??
Work 2 fish 4 days
1988 vintage 1436 Fisher Jon
1992 vintage 15 hp Merc
1988 vintage 1436 Fisher Jon
1992 vintage 15 hp Merc
So, I wanna talk about it! I am gonna start with an aluminum 4 blade. I will report the performance, good or bad. Now y'all got me thinking on installing a RPM and water pressure gauge....but it's just a 40hp....
The boat is at Porter's gittin' a rock guard installed this week.
The boat is at Porter's gittin' a rock guard installed this week.
Work 2 fish 4 days
1988 vintage 1436 Fisher Jon
1992 vintage 15 hp Merc
1988 vintage 1436 Fisher Jon
1992 vintage 15 hp Merc
In my experience the 4 blade will reduce your top end rpm's....
mine (90 Yammie) from 5800 with a three blade to 5100 with the four.
A good thing for me! Top end loss is from 35 to 31 on GPS but at least I'm not punishing motor with rpm's too high.
Water uptake has never been a problem with me as the highest I ever
lift my engine without tilting is about 6 inches and that's to idle in and out of really skinny water. With that setup if I can float I can move along. When I'm getting down on it in shallow water I'm up about 4 inches with no problems. I'm pushing 17' X 8' fiberglass tunnel.
Hope this helps!
mine (90 Yammie) from 5800 with a three blade to 5100 with the four.
A good thing for me! Top end loss is from 35 to 31 on GPS but at least I'm not punishing motor with rpm's too high.
Water uptake has never been a problem with me as the highest I ever
lift my engine without tilting is about 6 inches and that's to idle in and out of really skinny water. With that setup if I can float I can move along. When I'm getting down on it in shallow water I'm up about 4 inches with no problems. I'm pushing 17' X 8' fiberglass tunnel.
Hope this helps!
It may be that my sole purpose in life is simply to serve as a warning to others.
- grim reeler
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