Thread: 15/20 3 Blade? When to use it?
10-11-2007, 01:01 PM #1
15/20 3 Blade? When to use it?
When does a 15/20 3 Blade benefit a setup....? I know a 3 blade 15/19 pulls harder than a 4 blade 15/20 and the 15/19 sacrifices a little on top end compared to the 4 blade 15/20...but where does the 15/20 3 blade fit in? I realize it is a bit steeper than a 3 blade 15/19...does anyone run one...tested one....? Would a 15/20 3 blade offer the more or less pull than the 15/19 or would does it add top end and sacrifice pull like a 15/20 4 blade....
What setup would need a 15/20 3 blade....a strong 3++ looking for pull more than top end?
This stuff is a mystery to me...teach me please!
10-11-2007, 04:49 PM #2
- Join Date
- Jul 2005
- euxton nr chorley lancashire, england
10-11-2007, 06:10 PM #3
good question I had to send my 15/19 3 blade to Jerry for a little more pitch, I have a 15/20 4 blade that I need to send to him also for a better comparison, I really like my 3 blade it pulls hard all the way to top
I would love the try a 15/20 3 blade I just hate to spend 300 and it not gain anything if someone has one I will be glad to test it for free of course
10-11-2007, 06:41 PM #4
in my PERSONAL opinion a stage 3+ RUDE charger set up will benefit top end speeds from the 15/20R and maintain higher RPM's in my case i cannot tell the difference between accelleration of the 15/19R maybe i need to retest but if u get your boat running like i feel my boat does! ITS OVER! 15/20R and your gone! this of coarse in combo with a stage 3+ setup! i think if i had a REG stage 3 either S3 or Rotax set up i would run the 15/19R to get the RPM's with the 81mm venturi nozzle! just my opinion! i feel it takes the Rude to pull the HIGHER RPM WITHOUT touching the prop blades on the 15/20R with the 81mm ring! maybe im wrong just how i feel and my boat ROCKS! good luck!
10-11-2007, 11:30 PM #5
- Join Date
- Jan 2006
- Rydal, Georgia U S A
10-12-2007, 01:50 AM #6
I understand that a 15/20 3 blade requires more than a Riva Stage 3...but if you can spin one, what does a 3 blade offer over a 4 blade...?
Maybe a Stage 3 plus Rude Supercharger and Cam might be able to spin one...?
What does a 15/20 three blade offer in comparison to a 15/20 four blade if they were set to spin at the same rpm?
10-12-2007, 08:41 AM #7
if you spin the 20 at the same rpm you should see a 1-2 mph difference.
10-12-2007, 09:01 AM #8if you spin the 20 at the same rpm you should see a 1-2 mph difference.Today 02:50 AM
10-12-2007, 09:04 AM #9
10-12-2007, 09:20 AM #10
No...just tinkering with options...ideas...and theories...and I just want to learn!
I still have setup in my signature, 8100,... but I plan to go Riva Ecu with Rude S/C and Cam within next week or two...sold the CJ got some cash now!
If I could spin the 15/20 3 Blade at 8500 rpm....would I be faster than a 4 blade 15/20 at 8500 rpm?
I will be running my untouched 4 blade 15/20 when I do go to the stage 3++ setup....IF I can spin it to 8500+ pretty easliy, big IF there....I might try a 3 blade for fun and learning...but would like/appreciate others info/results that have run these 15/20 3 blades...
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