Prop question
11-16-2005, 10:58 AM
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Prop question
Hi folks,
I just ordered and received a stockpile of APC pylon props for my Magnum and Whiplash as nobody around these parts carries them.
Question: what is the reason for both 8.75" and 8.8" props? Is there a difference in basic design, or is it for another reason? I ended up ordering 8.8" diameter in 8.5" through 9.25" pitch. I don't have any 8.75" for comparison.
I'll be running these stock or slightly clipped on my SJ50, and clipped to 8" or so for my West .50.
Thx,
MJD
I just ordered and received a stockpile of APC pylon props for my Magnum and Whiplash as nobody around these parts carries them.
Question: what is the reason for both 8.75" and 8.8" props? Is there a difference in basic design, or is it for another reason? I ended up ordering 8.8" diameter in 8.5" through 9.25" pitch. I don't have any 8.75" for comparison.
I'll be running these stock or slightly clipped on my SJ50, and clipped to 8" or so for my West .50.
Thx,
MJD
11-16-2005, 11:20 AM
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RE: Prop question
The 8 3/4" props were the original pylon props and had a slightly wider blade. The 8.8" are the newer design and primarily used on the Nelson Q500 engines. Both seem to work fine, although I think the best top speed can be gotten with the 8.8" props.
11-16-2005, 04:43 PM
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RE: Prop question
I figured it was a design change, with the choice of 8.8 versus 8.75 to distinguish the difference.
Good - I bought the 8.8's with the goal of going fast. Not much other reason to buy these props though, I guess, is there?
Thanks folks,
MJD
Good - I bought the 8.8's with the goal of going fast. Not much other reason to buy these props though, I guess, is there?
Thanks folks,
MJD
11-17-2005, 12:48 PM
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RE: Prop question
ORIGINAL: MJD
Hi folks,
I just ordered and received a stockpile of APC pylon props for my Magnum and Whiplash as nobody around these parts carries them.
Question: what is the reason for both 8.75" and 8.8" props? Is there a difference in basic design, or is it for another reason? I ended up ordering 8.8" diameter in 8.5" through 9.25" pitch. I don't have any 8.75" for comparison.
I'll be running these stock or slightly clipped on my SJ50, and clipped to 8" or so for my West .50.
Thx,
MJD
Hi folks,
I just ordered and received a stockpile of APC pylon props for my Magnum and Whiplash as nobody around these parts carries them.
Question: what is the reason for both 8.75" and 8.8" props? Is there a difference in basic design, or is it for another reason? I ended up ordering 8.8" diameter in 8.5" through 9.25" pitch. I don't have any 8.75" for comparison.
I'll be running these stock or slightly clipped on my SJ50, and clipped to 8" or so for my West .50.
Thx,
MJD
No need to clip any of them on the SJ50 - except for maybe the 9.25 pitch. Then only a little.
Two of my all time favoite props are the 8.75x8.25 and the 8.75x9W.
Which muffler are you using ?
11-17-2005, 04:21 PM
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RE: Prop question
Hi Bob,
I have the SS muffler, so I was not planning to clip any of them for the SJ50 unless the higher pitches like the 9.25 seemed to be a bit much of a load. But for the SS muffler maybe not, right? Darn it I should have bought the other muffler, but oh well.
Based on the .50V1 prop recommendations I was going to look at the 8.75/9/9.25 range clipped down to around 8" on the stock pipe length for that motor. I chickened out on running APC 8" sport props despite the fact that many people seem to be doing so. Now I have a collection of those with no purpose..
MJD
I have the SS muffler, so I was not planning to clip any of them for the SJ50 unless the higher pitches like the 9.25 seemed to be a bit much of a load. But for the SS muffler maybe not, right? Darn it I should have bought the other muffler, but oh well.
Based on the .50V1 prop recommendations I was going to look at the 8.75/9/9.25 range clipped down to around 8" on the stock pipe length for that motor. I chickened out on running APC 8" sport props despite the fact that many people seem to be doing so. Now I have a collection of those with no purpose..
MJD
11-17-2005, 04:44 PM
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RE: Prop question
you will be fine with the SS muffler and any of those props (except the 9.25 pitch as noted)
in fact, if you want something scarey, get the 8.5x7.25 prop A little magic occurs.
in fact, if you want something scarey, get the 8.5x7.25 prop
A little magic occurs.
11-18-2005, 09:38 AM
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RE: Prop question
ORIGINAL: bob27s
you will be fine with the SS muffler and any of those props (except the 9.25 pitch as noted)
in fact, if you want something scarey, get the 8.5x7.25 prop A little magic occurs.
you will be fine with the SS muffler and any of those props (except the 9.25 pitch as noted)
in fact, if you want something scarey, get the 8.5x7.25 prop
A little magic occurs.
12-04-2005, 03:33 PM
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RE: Prop question
ORIGINAL: MJD
Say what? For which motor? Seems light for the SJ50/SS combo. Looks like the right load factor for the .50V1 though. Whatchoo talkin' about this magic? Don't tease me like that!
ORIGINAL: bob27s
you will be fine with the SS muffler and any of those props (except the 9.25 pitch as noted)
in fact, if you want something scarey, get the 8.5x7.25 prop A little magic occurs.
you will be fine with the SS muffler and any of those props (except the 9.25 pitch as noted)
in fact, if you want something scarey, get the 8.5x7.25 prop
A little magic occurs.
-------
While breaking-in the early version of the SS-40 engines using the apc 8.5x7 props, quite by accident/luck we found that the SS-40 had a secondary sweet spot just over 20K rpm as well. The 8.5" props ended up working great for the sport class racing. Racing the SS combination you would use an APC 8.5x7 up to 8.5x7.5 pylon prop. Peak RPM is up around 20K on the ground. Find peak rpm, back off 600-800 from there, and go
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12-05-2005, 11:08 AM
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RE: Prop question
Thanks Mike. Actually, Bob wrote me a PM on the subject so I found out what the deal was. I have yet to try this out as the weather has gone for a dump up here.
MJD
MJD
