Re: propellor and rubber of a F1D model

From: kevin_f1m <kevin1990__at_hotmail.com>
Date: Mon, 10 Mar 2008 15:44:32 -0000

Are the INAV hardcovers an interesting read? Wich one should i order
first? 1990-99 (the thickest)?

Kevin

--- In Indoor_Construction_at_yahoogroups.com, "kevin_f1m"
<kevin1990__at_...> wrote:
>
> 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 - 08:44:34 CET