Reply
 
Thread Tools Search this Thread
 
Old 30 December 2014, 19:36   #41
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,855
Quote:
Originally Posted by JohnnyMW View Post
I was thinking I should try raising one hole to see what happens thanks for the advice. I've noticed with the Vipermax that the rear end of the tubes sit quite low on the water, pretty much up to the rubbing strake even when moving at 20knts. Is this unusual or is this another indication that the engine is too low?
I'm assuming that you have a 5.8m vipermax? I have the 6.2m one. Both come from the same mould and rear of the tubes do drag in the water at speed. That's why it has great stability and is a sure footed ride. The 6.5m and above have raised tubes and they sit out of the water even at rest.
__________________

__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 31 December 2014, 04:40   #42
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,573
looks like you got sorted johnny 6 knot gain bang on.

regards jeff
__________________

__________________
jeffstevens763@g is offline   Reply With Quote
Old 31 December 2014, 05:51   #43
Member
 
Country: UK - England
Town: Wirral
Length: 5m +
Engine: 90 Etec
Join Date: Nov 2014
Posts: 22
Quote:
Originally Posted by Pikey Dave View Post
If it was setup by a decent dealer, then all should be well, I'd assumed it was a self install. Has it been serviced since new? if not, it's due & all the checks will be done as part of the service. If you post up the engine report I can have a look. Look on the report for "TPS Calibration" the number should be 190 +/- 30 so between 160-210

The TPS is showing 186 Dave, this seems ok then? Is it down to prop testing now?
Click image for larger version

Name:	ImageUploadedByRIB Net1420023044.970623.jpg
Views:	159
Size:	26.3 KB
ID:	101890
__________________
Newto is offline   Reply With Quote
Old 31 December 2014, 09:42   #44
RIBnet supporter
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 7,592
RIBase
Quote:
Originally Posted by Newto View Post
The TPS is showing 186 Dave, this seems ok then? Is it down to prop testing now?
Attachment 101890
TPS good, you're showing 5380 max rpm which is about right, but this might have been when the boat was airborne at some point. Are you positive that you had the throttle wide open when you only managed 4600?
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: See rule#5
Pikey Dave is online now   Reply With Quote
Old 31 December 2014, 09:48   #45
Member
 
Country: UK - England
Town: Wirral
Length: 5m +
Engine: 90 Etec
Join Date: Nov 2014
Posts: 22
Didn't really push the lever that hard, I will have a look and also take it on another run next week. I'll test a few things and hopefully get it right by spring. I'll let you know the outcome of my findings.
Thank you again for advice Dave!

Happy New Year!
__________________
Newto is offline   Reply With Quote
Old 22 March 2015, 11:41   #46
Member
 
Country: UK - England
Town: Wirral
Length: 5m +
Engine: 90 Etec
Join Date: Nov 2014
Posts: 22
Quote:
Originally Posted by Pikey Dave View Post
TPS good, you're showing 5380 max rpm which is about right, but this might have been when the boat was airborne at some point. Are you positive that you had the throttle wide open when you only managed 4600?

Tested this weekend with a new 15" prop, with three onboard and full tank got to 5100rpm running at 38mph so quite pleased with that! Thanks for your advice Dave, just need some warmer weather now!
😃😃
__________________
Newto is offline   Reply With Quote
Old 09 June 2015, 13:00   #47
Member
 
freespirit3's Avatar
 
Country: UK - England
Town: West Midlands
Boat name: Freespirit
Make: Redbay
Length: 6m +
Engine: Suzuki DF 140
Join Date: Apr 2013
Posts: 358
S/S Ballistic prop

Quote:
Originally Posted by jeffstevens763@g View Post
jonny

i have a 90 Suzuki on a 6m rib-quest with a 14 x 19 Ali prop i get 39 knots flat water no wind or tide @ 5800 rpm.
with a powertech prop 13.5 x 21 stainless steel roughly the same.
with a 14 x 20 stainless steel it drops the revs around 500 rpm and around 30 knots top end.
two people up 70 lts of fuel 20 kg of kit.
you could speak to Dave rose at rib-quest his brother in law has done quite a bit of prop calcs on a 140 Suzuki on a red-bay 6m.

hope that helps

regards jeff
I think I have finally got the prop I need.

The redbay 6.1 is quite heavy and (and mine is a 2002) a deep V, mine has six seats and I tested with about 90litres of fuel and three adults on board.(admittedly young adults, but lighter than me!)

STD prop that came with the boat
3 x 14 x 21 WOT 5600rpm Max Speed 34 knots
Had it repitched by Castle Marine
3 x 14 x 19 WOT 6000rpm Max Speed 35 knots
tried a Suzuki S/S Solas
3 x 14 x 20 WOT 6050rpm Max Speed 35.4 knots
tried a powertech S/S
3 x 13.5 x 21 WOT 5900rpm Max Speed 32.1 knots

bought a S/S Michigan Ballistic WOW !!
3 X 1/8 X 21 WOT 6000rpm Max Speed 38.3 knots
Much more grip, fine balance, reduced cavitation. lots of cup and looks like bits missing off the blades buts works, great overall

Tried the S/S Michigan Ballistic
3 x 13 3/8 x 19 WOT 6200> if you wanted and 35 knots (no good but could be if you had a heavy boat with dive gear, shot onto the plain.

I would like to thank Corrowyn at Castle Marine for all his patience, advice and sourcing this prop.

I feel I now have the best speed, best grip and should be the best boat speed for engine speed hence improved MPL

Ps I have heard that you have to be careful with these props as they can give too much stern lift and cause other issues such as engine overheating, mine hasn't as it is heavy.

Will have to wait for the next Ty Calch cruise with the BS brigade for more information.

For any of you looking for that special extra, well worth a try.
Attached Thumbnails
Click image for larger version

Name:	Holyhead blast.jpg
Views:	86
Size:	49.9 KB
ID:	105931  
__________________
freespirit3 is offline   Reply With Quote
Old 09 June 2015, 13:12   #48
Member
 
freespirit3's Avatar
 
Country: UK - England
Town: West Midlands
Boat name: Freespirit
Make: Redbay
Length: 6m +
Engine: Suzuki DF 140
Join Date: Apr 2013
Posts: 358
And a picture of the prop

Prop fitted to replace the Suzuki stock prop
Attached Thumbnails
Click image for larger version

Name:	IMG_20150526_133229.jpg
Views:	91
Size:	161.4 KB
ID:	105932  
__________________
freespirit3 is offline   Reply With Quote
Old 09 June 2015, 13:15   #49
Member
 
freespirit3's Avatar
 
Country: UK - England
Town: West Midlands
Boat name: Freespirit
Make: Redbay
Length: 6m +
Engine: Suzuki DF 140
Join Date: Apr 2013
Posts: 358
From the side

And another in all its beauty.

Please note this worked for me and as I found props are trial and error and not a straight forward science, I hope this is good advice for any of you with a similar issue.

I agree with many of the members that perhaps one of the issues is that the older DF140 seems to be lazy and does not feel like a 140bhp engine, this one has certainly come alive and feels more responsive.

Compromise is the best solution, mine will never be a 40knot plus boat but now it feels happier and will maintain the great Redbay sea keeping capabilities. Win Win
Attached Thumbnails
Click image for larger version

Name:	IMG_20150526_133247.jpg
Views:	77
Size:	130.2 KB
ID:	105933  
__________________
freespirit3 is offline   Reply With Quote
Old 09 June 2015, 13:50   #50
RIBnet supporter
 
mick's Avatar
 
Country: UK - England
Town: Wakefield
Boat name: Bouncer
Make: Redbay Stormforce
Length: 6m +
Engine: 2x Honda 90Hp
MMSI: 235025718
Join Date: Jun 2009
Posts: 3,984
Quote:
Originally Posted by freespirit3 View Post
And another in all its beauty.

Please note this worked for me and as I found props are trial and error and not a straight forward science, I hope this is good advice for any of you with a similar issue.

I agree with many of the members that perhaps one of the issues is that the older DF140 seems to be lazy and does not feel like a 140bhp engine, this one has certainly come alive and feels more responsive.

Compromise is the best solution, mine will never be a 40knot plus boat but now it feels happier and will maintain the great Redbay sea keeping capabilities. Win Win


Aye them Redbays are not the fastest but keep going in poor conditions
__________________
mick is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 08:47.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.