APC LS Prop Approval  
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All Forums >> RC Airplanes >> Pylon Universe - RC Pylon Racing >> QM-40 Racing >> APC LS Prop Approval
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APC LS Prop Approval - 3/8/2007 5:48:59 PM   
iamtom


 

Posts: 92
Joined: 4/30/2006
From: Cincinnati, OH, USA
Status: offline 		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
       Post #: 1

RE: APC LS Prop Approval - 3/8/2007 6:04:03 PM   
diggs_74



Posts: 1283
Joined: 1/20/2004
From: Emerald, WI, USA
Status: offline 		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...


_____________________________

Lee LaValley
NMPRA# 33w

(in reply to iamtom)
       Post #: 2

RE: APC LS Prop Approval - 3/8/2007 7:31:35 PM   
Ed Smith


 

Posts: 2837
Joined: 12/29/2001
From: Brantford, ON, CANADA
Status: offline 		Lee,

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

Ed S

(in reply to diggs_74)
       Post #: 3

RE: APC LS Prop Approval - 3/8/2007 8:03:26 PM   
diggs_74



Posts: 1283
Joined: 1/20/2004
From: Emerald, WI, USA
Status: offline 		I guess I've got a pitch gage and stuff for a reason..


_____________________________

Lee LaValley
NMPRA# 33w

(in reply to Ed Smith)
       Post #: 4

RE: APC LS Prop Approval - 3/8/2007 10:34:32 PM   
Arch Adamisin


 

Posts: 19
Joined: 7/4/2003
From: Taylor, Mi
Status: offline 		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

(in reply to diggs_74)
       Post #: 5

RE: APC LS Prop Approval - 3/8/2007 11:11:24 PM   
iamtom


 

Posts: 92
Joined: 4/30/2006
From: Cincinnati, OH, USA
Status: offline 		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

(in reply to Arch Adamisin)
       Post #: 6

RE: APC LS Prop Approval - 3/9/2007 1:26:57 AM   
Jim Duda



Posts: 218
Joined: 4/10/2006
From: Austin, TX, USA
Status: offline 		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))

< Message edited by Jim Duda -- 3/9/2007 1:47:53 AM >

(in reply to iamtom)
       Post #: 7

RE: APC LS Prop Approval - 3/9/2007 1:41:30 PM   
iamtom


 

Posts: 92
Joined: 4/30/2006
From: Cincinnati, OH, USA
Status: offline 		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
_________________

(in reply to Jim Duda)
       Post #: 8

RE: APC LS Prop Approval - 3/9/2007 3:01:24 PM   
Ed Smith


 

Posts: 2837
Joined: 12/29/2001
From: Brantford, ON, CANADA
Status: offline
quote:

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

(in reply to iamtom)
       Post #: 9

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