Most industrial supply places stock tubing or look for shops that build machine tools or spray painting automation. Before retirement I was an automation controls electrician and was able to acquire a lifetimes supply at work. For larger motors where weight is not as important the hobby shops sell tubing for RC control rods that is actually pneumatic tubing and they also sell tubing for antennas on RC cars. I like and recommend the car tubing to Wright stuff students and use it for Pennyplane.
Fred
----- Original Message -----
From: LeRoy C Cordes
To: Indoor_Construction_at_yahoogroups.com
Sent: Thursday, March 29, 2007 9:56 AM
Subject: Re: [Indoor_Construction] O-ring question
Fred, where do you get pneumatic tubing ?
LeRoy Cordes
In Downstate Illinois
On Wed, 28 Mar 2007 18:35:07 -0400 "Fred Tellier"
<fred-tellier_at_cogeco.ca> writes:
> I don't know many flyers who use rubber O rings they are way to
> heavy. Pneumatic tubing is available in many wall thickness and
> diameters, these are easy to make and I have never damaged a motor
> with them.
>
> Fred Tellier
> ----- Original Message -----
> From: dgbj_at_aol.com
> To: Indoor_Construction_at_yahoogroups.com
> Sent: Wednesday, March 28, 2007 5:45 PM
> Subject: Re: [Indoor_Construction] O-ring question
>
>
> Marty,
>
> I had another idea for making the O-ring removable. Fold the
> O-ring around
> the motor and put the two loops of the O-ring over the hook. I
> tried this
> with some of the O-rings I have and they were too stout to fold. I
> could place
> the O-ring on the far side of the hook and loop the loose motor
> through the
> back of the O-ring and around the wire, but this is not going to
> work with a
> wound motor, it is more difficult than attaching the wound motor
> without an
> O-ring. It might work with longer, thinner O-rings. I don't have
> any to try,
> you might be able to find some if you want to try this idea.
>
> Alternatively, a ring might be fabricated from steel wire in the
> same shape
> as a folded O-ring. It might be possible to use a loop of braided
> fishing
> line for this.
>
> My large O-rings weigh 0.043 grams each and the small ones weigh
> 0.0105
> each. Someone suggested the weight of the O-ring was not
> important. This poses
> a question that may be answered. Reducing the 0.6 gram motor
> weight by the
> 0.0105 gram O-ring weight reduces the available energy by 1.75
> percent. Is
> that enough to be important in a contest? If you are flying in a 9
> minute
> site, that is 9.45 seconds. If you are less than 9.45 seconds
> behind first
> place, it might be important.
>
> Gary Hinze
>
> ************************************** See what's free at
> http://www.aol.com.
>
> [Non-text portions of this message have been removed]
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
LeRoy Cordes
In Downstate Illinois
[Non-text portions of this message have been removed]
Received on Thu Mar 29 2007 - 08:06:30 CEST