[NSRCA-discussion] Wheels for skinny pants

Thu Mar 20 09:26:49 AKDT 2008

 Great point Stuart. I'll keep that in mind. It's truely amazing how much lighter you can make a plane by paying attention to every component. It really adds up. Mike

Stuart Chale <schale at optonline.net> wrote:  Just a thought on your axles if weight is an issue.  Switch to aluminum 8-32 bolts.  You will save a few grams right there and they will likely be strong enough.  I started with a steel bolt axle like you did on my pinnacle but switched over to the NMP aluminum axles.  Saved 6 or 7 grams I think.  I also switched my landing gear mounting bolts to aluminum and saved another 15 grams or so (6 bolts).  The real amazing thing is to compare the weight of a bag of 50 or so steel bolts to a bag of aluminum bolts of the same size.

Stuart

mike mueller wrote:      I drill out the axles of the MPI's to fit a nylon sleeve (I think it's a 1/4" in size) that is as long as the opening inside the wheel well. After that I put thick plastic washers on these sleeves that to add stability.The washers are about 1/2" in diameter and 1/8" thick. When everything sandwich's in it keep the wheels from wobbling around I use 8-32 stainless bolts for axles. I use a wheel pant mounting method that allows the axles to go all the way thru the wheel pants.
   http://www.rcaerobats.net/Wayne'sWheelpants.htm
   This is the best method I have ever used. By mounting this way it keeps the wheel pants from flexing in the airstream. Very solid and cheap too. I have used the NMP axles and find that they don't keep the wheel pants soild enough.
   The trick is to keep the skinny wheels from wobbling around. With the tiny axles that they come with you'll need to do something like I am. 
   So far so good with this system. I had to do it because of weight problems flying Electric. Mike

colin chariandy <cchariandy at yahoo.ca> wrote:
    Mike, what mod are you applying to the skinny MPIs to improve them?

  Colin.

mike mueller <mups1953 at yahoo.com> wrote:
    Hey Colin I have a pair. I'll get you the dimensions when I get home. They are really nice and very light. I still prefer the skinny MPI's with a modification. I've had great luck with them flying off of a very smooth grass field. Mike

colin chariandy <cchariandy at yahoo.ca> wrote:     Thanks Chad, those look perfect. They need to be just under 17mm wide to fit. I hope someone on the list has one to maesure.

  Colin.

Chad Northeast <chadnortheast at shaw.ca> wrote:
  MPI makes a metal hub wheel that is pretty light but a little wider than the really skinny ones that would probably fit the CARF/ZN wheelpants.  Also it has a harder rubber ring around it so the soft foam does not wear as fast.

http://www.maxxprod.com/mpi/mpi-29.html

Maybe someone has a set on the list and can send you the width!

Chad

----- Original Message -----
From: Ron Van Putte <vanputte at cox.net>
Date: Tuesday, March 18, 2008 8:56 pm
Subject: Re: [NSRCA-discussion] Wheels for skinny pants
To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>

> I didn't see a response to Colin's request.  I have some 
> new MK  
> (plastic hub) wheels, but none are quite big enough.  2.5" 
> is  
> approximately 63.5mm.  The biggest MK wheel I have is 
> 50mm.  I can  
> measure it, but don't know how much to scale up the width 
> dimension  
> to represent a 63.5mm wheel.
> 
> Ron Van Putte
> 
> On Mar 18, 2008, at 8:37 AM, colin chariandy wrote:
> 
> > Can anyone measure the width of MK and Tetra (plastic hub) 
> wheels,  
> > 2.5" diameter? I'm trying to find out which wheels will fit 
> into  
> > the skinny pants that come with the CompARF Integral. They 
> look  
> > cool...so I would like to try to use them. I know the really 
> thin  
> > MPI wheels will fit but our local feild tends to be soft for 
> quite  
> > a while, the thin wheels may dig in.
> >
> > Also, where can we find MK wheels in North America?
> >
> > Thanks all.
> > Colin
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