Re: propellor and rubber of a F1D model

From: John Kagan <john_kagan_at_hotmail.com>
Date: Mon, 10 Mar 2008 15:07:59 -0000

--- In Indoor_Construction_at_yahoogroups.com, "kevin_f1m"
<kevin1990__at_...> wrote:
> ...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 assume this is a fixed pitch prop?

What kind of RPM are you getting? Take a few readings throughout the
flight.

I'd bet that the effective, overall pitch of your prop is not 650mm
(about 25"). It is very common for beginners to mis-measure the pitch,
or to have a very uneven pitch distribution.

The RPM readings will give a better indication of what's going on. If
you really have 650mm of pitch I'd expect the RPM at the start of the
flight to be very high.
Received on Mon Mar 10 2008 - 08:08:01 CET