Tapio,
Can you describe your spring? Size of wire, OD of the spring, number of turns, plus the rotation in degrees when loaded?
Do you also have a particular torque setting where you think the spring should be fully closed?
Regards.
Mike Kirda
--- In Indoor_Construction_at_yahoogroups.com, Tapio Linkosalo <tapio.linkosalo@...> wrote:
>
> On Mon, Nov 26, 2012 at 12:58 PM, Akihiro Danjo
> <adanjo-373_at_...>wrote:
>
> > **
> >
> >
> > Hi Tapio san.
> > Glad to know you enjoy indoor because it must be cold even indoor in
> > your country.
> >
> > >Then from 4 to 6 minutes the prop seems to switch over to low pitch,
> > quite rapidly even though I have tried to make harder springs than I have
> > had before.
> >
> > Why `harder' spring? Should you try softer spring?
> >
>
> I have so far used very soft springs, of up to 7 turns. This means that the
> change in the VP has been very rapid, and I have been trying to work
> towards more gradual change. The flight path of my model suggested that the
> change still was too rapid, the model was already sinking on the high
> pitch, and then quickly changed to a climb on the low. This should be fine
> for low ceiling flying, but less so in a high site. I guess I should start
> producing more props for different sites, but so far I have been only using
> the same ones for any site
>
>
>
> >
> > >The flight was on a rather fat motor, 100mm loop that took only 580 turns
> > (up to max torque of 27 g*cm; it would take more but during the short slots
> > to fly I did not want to break a motor). I backed off 15 turns to a launch
> > torque of 20 g*cm, and landed with 40 turns remaining.
> >
> > Why did you back off 15 turns?
> > 15 x2 = 30 turns = you wasted about 45 secs.
> > 27gcm will be OK for F1Ds. Do you have any launching problem?
> >
> >
> No start problems, but I would have been hitting the ceiling (as I did on
> the first test flight) if I had started with full power. The basis of the
> issue is that I do not have separate props for low ceiling. I guess that if
> I had the time to do enough trimming, I should open the top setting more
> and try to fly without backoff. But I'm not sure if I'll have the time to
> do that.
>
>
>
>
> -Tapio-
>
Received on Mon Nov 26 2012 - 06:26:49 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:47 CET