Re: Re: Helicopter and FF Help

From: Kody Priddle <pipercub0749_at_gmail.com>
Date: Mon, 26 Mar 2012 10:15:37 -0400

Mark,

Thanks. My data supports your first paragraph well.

You say to "determine how many turns that will take..." I am thinking that
I would find out how many revolutions per minute are needed to sustain lift
and then work the math from there. Does that sounds like it would be a
reasonable way to go about it?

-Kody

On Sun, Mar 25, 2012 at 12:11 AM, Mark Schaefer <SandySchaefer708_at_msn.com>wrote:

> **
>
>
> Your rubber conditioning is fine. Doing it the day before and then the day
> of use is little better. Trying to get official fight on third or more time
> the motor is used on copter flight is the best because The motor will take
> more winds then.
>
> Before changing the length or diameter of motor based on turns left over
> at end of flight you need to estimate ultimate time a copter will fly. Then
> determine how many turns that goal will take, the rest is math. My guess is
> around 3 minutes which would mean the weight and length are not ready to be
> adjusted at this time.
>
> In very general terms 1. are you getting all winds into the motor it
> will take and can you estimate how many turns this particular will take in
> a educated manner? 2. Are there any warps in construction, is every part of
> copter PERFECTLY STRAIGHT, is any wood bending under stress of the motor or
> during flight? In my experience number two is what needs worked on for
> higher flight times followed by ONE which is sort of a art in part.
>
> Mark Schaefer
>
>
>
>
>
>
>
> On Mar 24, 2012, at 11:25 PM, "Kody P." <pipercub0749_at_gmail.com> wrote:
>
>
>
> >Thanks Joshua for responding!
> >
> >I'm getting times around 1:45 with about 1.4g of .125" rubber or 1.86g
> >of .155" rubber. In the first case I am left with a good amount of
> >winds; in the second I am left with almost none. How many winds left is
> >ideal?
> >
> >Do you have any advice for breaking in or prestretching rotors? (#2 on
> >my last message)
> >
> >-Chris
>
> Chris,
>
> I managed a flight of 1:39 today with a 2g loop of .125". I know that I
> need to shorten this motor, as I'm landing with a whopping 47% of my
> original winds.
>
> My break-in technique is a mishmash of several techniques. First, I
> stretch the rubber six times its length and lubricate it. I leave it for
> six minutes in the stretched position. I tie the rubber with the O-rings,
> extensions, ect. and wind it up slowly to about 75% of its maximum torque.
> I would also appreciate some advice to refine this method.
>
> -Kody
>
>
>
Received on Mon Mar 26 2012 - 07:22:58 CEST