Re: propellor and rubber of a F1D model

From: vladimirlinardic <vladimirlinardic_at_yahoo.com>
Date: Sun, 09 Mar 2008 21:31:15 -0000

I usually match the rubber to prop and not prop to rubber.

I would suggest going up in rubber cross section Lowering the pitch
you will use turns too fast probably and climb too fast. The idea is
to have as high a p/d ratio as possible and use turns as slow as
possible and is rectricted by stability issues at these high p/d.
prop efficiency increases with higher p/d as well. The only time I
feel you should use a very low pitch is in cat 1 as you have so
little height to use up the turns toward the end. Anything else a
pitch low around 28 inch works for me...

Vlad

--- In Indoor_Construction_at_yahoogroups.com, "kevin_f1m"
<kevin1990__at_...> wrote:
>
> Hi,
>
> I'm new to F1D models.
>
> I have 2 F1D's now, one 1.2 grams and one 1.3 grams.
>
> I already have flown with them. But I have a problem. I have used
> rubber (tan II 07/99) of 1.6 grams/meter and I had many turns left
on
> the rubber. I think 1.3 g/m is a normal valuae for this type of
> models, isn't it?
>
> Do I need to lower the pitch? It is now 650 mm but I formed the
> blades on an 750-800 mm propblock so the tippitch is to high. Maby
I
> need to try 550 mm so the avarage pitch will be around 650 mm.
>
> I also would like to know how many turns I can get on a motor of
0.6
> grams. For example for motors of 1.2, 1.3, 1.4, 1.5 and 1.6 g/m.
>
> How many turns do I need to have at the end of the flight? I know
> with a F1M model it's about 10% of the start turns.
>
> I hope someone can help.
>
> Kevin Lamers
>
Received on Sun Mar 09 2008 - 14:31:19 CET