[NSRCA-discussion] Serious Torque on the Nose of the Model - RESUBMITTED

[Dave Harmon]

The Falcon 21x14 V2 I received this week from F3A/U weighs 38g.

The APC 21x14 I had been using weighs 129g.

 

Dave Harmon

NSRCA 586

K6XYZ[at]sbcglobal[dot]net

Sperry, Ok.

 

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of mike mueller
Sent: Thursday, December 06, 2012 7:41 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Serious Torque on the Nose of the Model -
RESUBMITTED

 

Charlie the Falcon V2 props should weigh in less than 50 grams. 72 grams is
more like the V1 Falcons.

 I should know I have a lot of them!

 Mike

 

From: Charlie Barrera <charliebarrera at consolidated.net>
To: nsrca-discussion at lists.nsrca.org 
Sent: Wednesday, December 5, 2012 10:59 PM
Subject: Re: [NSRCA-discussion] Serious Torque on the Nose of the Model -
RESUBMITTED


I was using a APC 20.5 X 12WE prop. I had previously used a Falcon V2 21 X
14. I had flown with the Falcon a couple of times. I used the APC after
noticing the Falcon had delaminated on the leading edge. The difference in
weight was substantial - the Falcon prop weighed 72g vs. the APC was around
120g (I never weighed it but immediately noticed the difference). The
difference in the rotating mass (the propeller disc) produced greater
rotational forces. If you can imagine a small gyroscope spinning in your
hand, when you move it perpendicular to its rotating axis, you get a force
that is at a right angle to the axis. This is the force that the fuselage
must absorb. When I powered up and increased the roll rate for the turn to
downwind, the structure failed. I had seen several WindS Pro's fly with
Q80's nose mounted with no rear brace. There were no problems that I heard
of. When it failed on me, I had an ahah moment and should have known better.
I have written an article for the K Factor.

Charlie




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