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APC LS Prop Approval

Old 03-08-2007, 12:48 PM
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iamtom
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Default APC LS Prop Approval

Gentlemen
This is to advise you that APC has qualified a new prop 7.4x7.81
The prop is available from APC
Please consider this as official approval of the above prop in compliance
with the AMA 2007 rules.
This prop is similar to the 7.4 X 7.8 but with an increase in thickness
from station 4 decreasing to the original thickness at the tip. This
increases the natural resonant frequency from 46,000 RPM to 52,000 RPM.
It is recommended that all users continue to examine all of the new
series props after each run.

Pete Reed for the RCR Contest board
And Tom
Old 03-08-2007, 01:04 PM
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diggs_74
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Default RE: APC LS Prop Approval

So, does that mean the original 7.8 is illegal?? Since my skills at this point don't justify the purchase I am going to continue with the older engine but does that mean I have to run the new 7.8-1 which is thicker(read heavier) and most likely won't turn up as much?? Just wondering...
Old 03-08-2007, 02:31 PM
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Ed Smith
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Default RE: APC LS Prop Approval

Lee,

Exactly the question I asked on the NNMPRA site, only I included all of the old carbon props.

Ed S
Old 03-08-2007, 03:03 PM
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Default RE: APC LS Prop Approval

I guess I've got a pitch gage and stuff for a reason..
Old 03-08-2007, 05:34 PM
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Arch Adamisin
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Default RE: APC LS Prop Approval

Gentlemen,
Has only the one prop been modified or have all the new props been reconfigured? Are the 7.5,7.6 and 7.7 also going to be re released?

Arch
Old 03-08-2007, 06:11 PM
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iamtom
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Default RE: APC LS Prop Approval

We will have to wait for a ruling from the Race committee and see what APC accomplishes in the near future. Nothing else has been released as yet but I will keep you informed as info comes in. .
Tom
Old 03-08-2007, 08:26 PM
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Jim Duda
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Default RE: APC LS Prop Approval

I think we're all wondering if the new beefier prop(s) will allow the LS to come into its "sweet spot" as well as the 7.6 and 7.7s did... "Patience is a Virtue". ((Did Ed Smith say that? - (wink))
Old 03-09-2007, 08:41 AM
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iamtom
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Default RE: APC LS Prop Approval

New Propeller Qualified for Pylon Racing

3/8/2007--APC has qualified a new prop 7.4x7.81 The prop is currently commercially available

Please consider this official approval of the above prop in compliance with the 2007 Competition Regulations.

This prop is similar to the 7.4 X 7.8 but with an increase in thickness from station 4 decreasing to the original thickness at the tip. This increases the natural resonant frequency from 46,000 RPM to 52,000 RPM.

It is recommended that all users continue to examine all of the new series props after each run.

Propellers previously qualified continue to be legal for use in Radio Control Racing.

Pete Reed for the Radio Control Racing Contest board
http://www.modelaircraft.org/comp/competition.htm
This is on the AMA web site and should answer all questions pertaining to the QM-40 Prop situation.
Tom
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Old 03-09-2007, 10:01 AM
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Ed Smith
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Default RE: APC LS Prop Approval

Propellers previously qualified continue to be legal for use in Radio Control Racing.
The above quote is now in the AMA rule for Q40.

It means that all of the propellers that, we were told failed at Phoenix, are still legal for use in any engine.

Ed S

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