[NSRCA-discussion] Motor Mount

[Dave]

George,

 

Motors designed to be mounted on one end only in airframes with structure
strong enough to handle the substantial cantilevered rotating mass work just
fine.  Several years ago, several planes (different designs and
manufacturers) with several motor types had problems with "whirl flutter"
and motors broke loose, departed the plane, or tore the nose off the plane.
Having run softmounted, hardmounted, firewall mounted, nosering mounted, and
mounted on both ends, I've found it easiest to control resonances in the
plane when the mount is at both ends, and even better when a softmount is
used.  A number of guys in D1 are running the Hacker A60 hardmounted to the
nosering with a hardmounted aft bearing support - which the motor is
designed for (Hacker sells a mount, or you can buy a flange bearing and
setup your own aft support mechanism).

 

Regards,

 

Dave

 

  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of George
W.Kennie
Sent: Wednesday, June 03, 2009 12:48 PM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Motor Mount

 

 

Hi John,

 

Sorry to have to tell you that I received no replies to my inquiry.

 

I have the feeling that most people are just not addressing this issue.

 

It would make a great product for somebody like Jerry or Chris to
produce.All that would be required is 

an X brace with an oversize receptacle at center to receive plastic inserts
(like props) sized to fit shaft

bearings.

 

Georgie

 

 

 

 

 

 

----- Original Message ----- 

From: John <mailto:jferrell13 at triad.rr.com>  Ferrell 

To: General pattern discussion <mailto:nsrca-discussion at lists.nsrca.org>  

Sent: Wednesday, June 03, 2009 8:50 AM

Subject: Re: [NSRCA-discussion] Motor Mount

 

FWIW:

I am interested in an answer to your question too! It sure looks to me like
some kind of nose bearing would be prudent...

 

John Ferrell  W8CCW
 
"All that is necessary for the triumph of evil is for good men to do
nothing." -- Edmund Burke
...."The problem with socialism is that you eventually run out of other
people's money."  
   MARGARET THATCHER 
http://DixieNC.US

----- Original Message ----- 

From: George W.Kennie <mailto:geobet4 at verizon.net>  

To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  

Sent: Monday, June 01, 2009 4:54 PM

Subject: [NSRCA-discussion] Motor Mount

 

Hey Guys,

 

I have a new project in the works and it involves mounting a 2K watt motor.
This will be my first larger motor install so I felt that some advice from
the Pros

would probably be appropriate.

 

The Motor is an outrunner and I can mount it from the back side directly to
the firewall OR I can use standoffs and mount it from the front side of the
motor.

I keep feeling that there needs to be some kind of a stabilizing bearing on
the free end as there portends to be a significant amount of rotating mass
if I just 

bolt the thing to the firewall while a pound of motor whirls around with a
large prop exerting inertial rotating energy beyond the front of the cowl.
It seems like 

If I use the stand-offs, there will be a more rigid area between the prop
and the motor, but then I worry about the back end. Should I figure out some
kind of a 

bearing mount on the firewall?

 

Somebody set me straight on the accepted procedure please. 

 

Thanks for you help,

 

Georgie 

 


  _____  


I am using the Free version of SPAMfighter <http://www.spamfighter.com/len>
.
We are a community of 6 million users fighting spam.
SPAMfighter has removed 25187 of my spam emails to date.
The Professional version does not have this message.


  _____  


_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion


  _____  


_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20090603/b1c6e797/attachment.html>