Re: Re: Hints for Cat IV LPP flying

From: steven richman <topdawggt2006_at_gmail.com>
Date: Thu, 4 Mar 2010 08:48:04 -0500

First Hey Mark, Sorry I have not been around. Thanks for the shout out.
Hopefully one of these days soon I will actually get back into flying. I do
miss it greatly. I still have all my stuff, so hopefully its just like
hopping back on a bicycle right?

As far as CAT IV LPP. When I was making my run at the record, I did a lot
of testing at USIC, using 1/5 motors. I think it is very beneficial, but
expect times to be higher on your 1/4 motor testing, than actual times will
be. This is mainly becuase the rubber wont bunch up and "distribute" the
same as a full size motor, if that makes any sense. I also did not use
sleeves on my record flights. Not sure if that would have helped or not.

I belive my prop pitch was around 18, id have to do some searching. But it
was a very high flaring prop. I think 2-2.5 grams of rubber is about right
from my experince. I think my record flight was on .086-.088. Last comment
is on launch torque. I launched at almost 1.1 In. Oz. With a flaring prop
you will need much more torque to get it to the roof. I don't think .4 in
oz. with any prop (unless pitch is very low) will get you anywhere near the
roof. Hope that is somewhat helpful!

-steven richman


> For starters, I was wondering the approximate range of rubber size to use,
especially to get to the ceiling. My prop is now set at 22" pitch. How does
a 20" loop of .093" sound? Or does high ceiling flying require something
like 24" of .080"? I plan on practicing using a 1/4 motor in the gym and
later at Tustin to test.
>
On Wed, Mar 3, 2010 at 8:33 PM, ykleetx <ykleetx_at_gmail.com> wrote:

>
>
> Thank you for the feedback. I'll start tonight with
>
> 1/4 motor of .60g will try .093" and .083"
> ballast for full 2.5g motor -- plane weighs 5.6g at launch
> prop pitch 18.5"
>
> And see how it goes.
>
> I'll ask about the motor sleeve later :-)
>
> -Kang
>
> p.s. I've been flying my daughter's 2010 SO plane. (competition is over.)
> The best I could do is 3:45 at 30' no touch. Let's see how the LPP goes.
>
>
> --- In Indoor_Construction_at_yahoogroups.com<Indoor_Construction%40yahoogroups.com>,
> "Bill Gowen" <wdgowen_at_...> wrote:
> >
> > I'm not a great LPP flyer in Cat 4 but I would guess you would do best
> with something in the range of 2 1/4 to 2 1/2 grams of rubber in a motor
> that is 20" to 22" long. You will probably need to use sleeves at both ends
> of the motor. Your model should be able to handle a launch with something
> over .4 in-oz of torque. You may need to use less pitch to get sufficient
> climb but this will depend on your prop design and how much it flares.
> >
> > Maybe others will chime in with more or different info.
> >
> > ----- Original Message -----
> > From: ykleetx
> > To: Indoor_Construction_at_yahoogroups.com<Indoor_Construction%40yahoogroups.com>
> > Sent: Wednesday, March 03, 2010 5:27 PM
> > Subject: [Indoor_Construction] Hints for Cat IV LPP flying
> >
> >
> >
> > I have the opportunity to fly in Tustin in April, though I've never flown
> indoor before, other than coach Science Olympiad. I plan to enter LPP.
> >
> > I would appreciate any pointers on how to fly in a CAT IV site like
> Tustin. I now fly in a middle school gym where I can practice 30' no touch
> flights.
> >
> > For starters, I was wondering the approximate range of rubber size to
> use, especially to get to the ceiling. My prop is now set at 22" pitch. How
> does a 20" loop of .093" sound? Or does high ceiling flying require
> something like 24" of .080"? I plan on practicing using a 1/4 motor in the
> gym and later at Tustin to test.
> >
> > Thank you.
> >
> > -Kang
> >
>
>
>
Received on Thu Mar 04 2010 - 05:48:06 CET