On Mon, Nov 26, 2012 at 12:58 PM, Akihiro Danjo
<adanjo-373_at_mx1.ttcn.ne.jp>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 - 04:05:21 CET