Re: Re: Prop Thrust Angles

From: <mikekilmer_at_bellsouth.net>
Date: Sun, 10 Feb 2008 18:21:17 +0000

Mark, try the Tangent offset method. Measure a straght line mart of 0" and 10" 90 deg to that line _at_ 10"
using a engr. scale measure .052407779 ( rounded of .052) that is 3 deg. or use a Protractor to
measure it. Note: using a the 20 scale it is easier to measure the .052
mike k

-------------- Original message from "Mark" <f1diddler_at_yahoo.com>: --------------


> --- In Indoor_Construction_at_yahoogroups.com, LeRoy C Cordes
> wrote:
> >
> > I am putting together Alan Cohen's MiniSlick and have a question.
> He
> > specifies 0 degrees downthrust and 3 degrees left thrust on the prop
> > hanger. How the devil do you guys manage something like 3 degrees
> left ?
> > The motor stick is 3/32" and about all I think I can do is to make
> a
> > slit at a shallow angle - How the devil do you manage any accuracy
> in
> > making these kinds of cuts ?
>
>
> The same way one manages angles with bigger models. Me, I stick a 3
> or 4 inch piece of very straight wire into the bearing so that it
> sticks out the front about three inches. Set this over a piece of
> paper having a drawn angle, 3* or whatever. Of course, align the
> lateral middle of bearing with the vertex of angle, and motorstick
> parallel with one of the angle legs. You can do all this before
> solidly gluing in the bearing, such as tack gluing, or in the case of
> solid motorstick, just friction sometimes works. For the prior slice
> into motorstick, you can take an "angled guess," see how it fits,
> adjust accordingly, and guess better next time.
>
> Similar method can be used for downthrust, provided you want to
> measure downthrust using motorstick datum, which may or may not be
> the effective downthrust. With wire pigtails and Harlan style
> bearing, further adjustments are possible in field (rather, on-floor)
> but getting pretty close in construction makes everyone happier.
> Mark F1diddler
>
>
>
>
> Yahoo! Groups Links
>
>
>

[Non-text portions of this message have been removed]
Received on Sun Feb 10 2008 - 10:21:39 CET