Re: propellor and rubber of a F1D model

From: kevin_f1m <kevin1990__at_hotmail.com>
Date: Mon, 10 Mar 2008 15:18:01 -0000

Hi,

It's a fixed pitch prop.

Don't know exactly about the RPM, but I can't say it's realy fast,
but that can be due to my experience with F1M.

The pitch distribution of my blades are good while a made them on a
propblock made by the 'bandsaw propblock mold' of IndoorDuration.com.

But like I said, the pitch distribution of my blades doesn't match
the pitch I set with my pitch gauge.

Can you give me an indication of RPM's I must aim for at the start,
cruise and the end of the flight. Than can I count them next weekend
and adjust it. Wich is quitte easy with a tube-like hub.

Kevin


--- In Indoor_Construction_at_yahoogroups.com, "John Kagan"
<john_kagan_at_...> wrote:
>
> --- 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 - 08:18:01 CET