Prop testing Time to flog the dyno mule

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Waterthunder
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Prop testing Time to flog the dyno mule

Post by Waterthunder »

Some of the prop testing we are doing for our 418 Combo. A 4 blade and 3 blade Whirl Wind, 4 blade and 3 blade Sensenich, 9 blade Saber, 10 Blade Warp Drive. The dyno mule is gonna go thru a few day's of flogging.

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farmboy
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Re: Prop testing Time to flog the dyno mule

Post by farmboy »

Should be very interesting to see how close or apart these props are. Can't wait to see the results!
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Re: Prop testing Time to flog the dyno mule

Post by BlowInIt »

I can't believe you let a whirlwind in the shop! No razors though huh?

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Re: Prop testing Time to flog the dyno mule

Post by Dixiedog60 »

My money is on the "R" :happy1:
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Re: Prop testing Time to flog the dyno mule

Post by Big Casino »

My money is on them all being within 5% of each other, all things being the same, between the various blade types of similar styles, regardless of the manufacturer. I think the big difference is going to be between 3 vs. 4 blades .... Staggered vs. Evenly spaced "Warp, Razor, Saber" type blades ... and then warp type blades vs. larger cord blades... IMO
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Re: Prop testing Time to flog the dyno mule

Post by Bagman »

I hope the results actually get posted.
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Prop testing Time to flog the dyno mule

Post by DannySauls »

What diameters are you testing Dave?

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Re: Prop testing Time to flog the dyno mule

Post by DynaMarine »

Curious to see how the 9-blade tests out.
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Re: Prop testing Time to flog the dyno mule

Post by Waterthunder »

The thrust peak numbers will all be very close but the thrust curve will vary and some of the props the BSFC will go up by as much as 20%. BSFC is short for brake specific fuel consumption thats the amount of fuel burned in relation to work performed. I have been messing with this stuff for a while and I will say each prop does have an area that it will out perform all others. It really comes down to what the individual prefers their boat to perform best at. The Whirl Winds are very smooth, the Sensenich is very efficient, The Saber and Warp Drive have great top end.
THE PROOF IS IN THE PROP!

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Re: Prop testing Time to flog the dyno mule

Post by loudmouse »

I hope your testing the NGR? Am interested in the bsfc, the curve and peak numbers. Also like to compare the NGR to the Saber.
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Re: Prop testing Time to flog the dyno mule

Post by Waterthunder »

So far we haven't found a blade that is more fuel efficient then the R blade. We did do some back to back comparisons between the R blade and the NGR. What do you primary use your boat for?
THE PROOF IS IN THE PROP!

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Prop testing Time to flog the dyno mule

Post by DannySauls »

What diameters were the different blade styles you tested?

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Re: Prop testing Time to flog the dyno mule

Post by JB550 »

loudmouse wrote:I hope your testing the NGR? Am interested in the bsfc, the curve and peak numbers. Also like to compare the NGR to the Saber.
X2

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Re: Prop testing Time to flog the dyno mule

Post by JROWLAND »

would like to see how the 9 blade compares to the r

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Re: Prop testing Time to flog the dyno mule

Post by farmboy »

JROWLAND wrote:would like to see how the 9 blade compares to the r
I bet its very close #'s at WOT... At least on my o'l dinosaur it seemed that way...
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Re: Prop testing Time to flog the dyno mule

Post by air-roberts »

I know I tried the r on my step then put a whirlwind wt/ex which is equivalent same and I had to put 1 more deg pitch to achieve the same wot which tells me it's lighter which gives you free h.p.
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Prop testing Time to flog the dyno mule

Post by DannySauls »

What was the diameter of the R vs the WT EX Robbie?

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Re: Prop testing Time to flog the dyno mule

Post by BlowInIt »

Maybe the whirlwind required more pitch because it was less efiecent?

Dave, if the R blade is more efiecent then sabers why is it that most people who have gone to skinny blades reported better cruise at same wot rpm, as well as more top speed wide open?

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Prop testing Time to flog the dyno mule

Post by DannySauls »

The WT EX is a 79" and I believe the R is an 80" or 81" standard so that would more than likely explain why the whirl wind needed an extra degree. Has nothing to do with efficiency and that's probably why Dave won't answer the question I asked about diameter!

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Re: Prop testing Time to flog the dyno mule

Post by air-roberts »

by no means am I stating that one is better than the other because they both build a hellovva prop they was both the same diameter maybe a 1/4 of a inch between and another difference was the whirl was 3" closer to the g/b because of the hub which can also alter the results. I think the sen was 791/2 and the whirl was 791/4 can't remember exactly but I was doing a self test because when the saber / razor craze was going on everyone I sold the razorx to said they had to put another deg from the saber to achieve the same r.p.m. so my only conclusion was lighter which = free h.p.
i'm not on here trying to compete and sell i'm only stating what my personal tests were that's why I like what dave's doing that's the only way to find out the right combo for you preference is to test different combos on a thrust tester. and every one can't afford one so thanks to dave he's doing the work for everyone
Last edited by air-roberts on Thu Jun 13, 2013 8:18 am, edited 1 time in total.
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experimenting with old step w/t experimental 384.8 c.i. nos 2.68 rotator, 80" three bld ? R
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Thanks to dave http://waterthunder.com/
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Re: Prop testing Time to flog the dyno mule

Post by ptr34 »

Weight=snap not pitch jmo. Talking about the difference between two different blade designs . Not the same . It may take a prop more pitch to slow the motor down than the other.
Last edited by ptr34 on Thu Jun 13, 2013 9:14 am, edited 1 time in total.
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Re: Prop testing Time to flog the dyno mule

Post by Bruce »

ptr34 wrote:Weight=snap not pitch jmo
Ill disagree with that had to add a degree in a buddies prop when he went from a 1250 tip weight blade to 1000 gram tip weight blades
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Re: Prop testing Time to flog the dyno mule

Post by air-roberts »

Bruce wrote:
ptr34 wrote:Weight=snap not pitch jmo
Ill disagree with that had to add a degree in a buddies prop when he went from a 1250 tip weight blade to 1000 gram tip weight blades
that's what I was saying turning weight is way better than dead weight I don't remember the calculating factors I n drag racing but i'd rather loose 20 lbs of turning weight than 50 lbs of dead weight
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experimenting with old step w/t experimental 384.8 c.i. nos 2.68 rotator, 80" three bld ? R
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Thanks to dave http://waterthunder.com/
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Re: Prop testing Time to flog the dyno mule

Post by ptr34 »

I had to different Ngr's on my boat and one was way lighter and didnt have to add pitch. Guess some blades just grab the samew amount of air no matter what the weight is. Or my boats just bada$$ like that ;)
if u don't run dry .then should have gotten a bassboat
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Re: Prop testing Time to flog the dyno mule

Post by Big Casino »

ptr34 wrote:I had to different Ngr's on my boat and one was way lighter and didnt have to add pitch. Guess some blades just grab the samew amount of air no matter what the weight is. Or my boats just bada$$ like that ;)
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