T-Rex 450xl head speed

[Kevin]

any idea what head speed for normal hovering and circuits I should be
aiming at ? I have just brought my first tacho
--
Kevin R
Reply address works

[Beav]

"Kevin" <dontemailme@ntlworld.com> wrote in message
news:1LiOj.18146$B83.17233@newsfe3-gui.ntli.net...
> any idea what head speed for normal hovering and circuits I should be
> aiming at ? I have just brought my first tacho

A minimum 1800rpm I'd say, but 2000 would be even better.


--
Beav

VN 750
Zed 1000
OMF# 19

[The OTHER Kevin in San Diego]

On Sat, 19 Apr 2008 09:15:41 GMT, Kevin <dontemailme@ntlworld.com>
wrote:

>any idea what head speed for normal hovering and circuits I should be
>aiming at ? I have just brought my first tacho

2800+

The TR is a bit soft so lack or RPM on the big fan translates to lack
of RPM on the little one...

I run all my 450s at 3000 on the head. You can run woodies, but make
sure they're balanced VERY well and replace if if they have any
contact with anything but air.. Thankfully, I crash often enough I
don't have to worry about a set failing due to fatigue. :)

[The OTHER Kevin in San Diego]

On Sun, 20 Apr 2008 16:26:21 GMT, "Beav"
<beavis.original@ntlwoxorld.com> wrote:

>
>"Kevin" <dontemailme@ntlworld.com> wrote in message
>news:1LiOj.18146$B83.17233@newsfe3-gui.ntli.net...
>> any idea what head speed for normal hovering and circuits I should be
>> aiming at ? I have just brought my first tacho
>
>A minimum 1800rpm I'd say, but 2000 would be even better.

WAY too slow for a 450 bird Beav. It'll fly, but it'll be very very
sluggish and I'd be amazed if the tail held with the pitch needed to
get it airborse at that RPM.

[Kevin]

The OTHER Kevin in San Diego wrote:
> On Sun, 20 Apr 2008 16:26:21 GMT, "Beav"
> <beavis.original@ntlwoxorld.com> wrote:
>
>> "Kevin" <dontemailme@ntlworld.com> wrote in message
>> news:1LiOj.18146$B83.17233@newsfe3-gui.ntli.net...
>>> any idea what head speed for normal hovering and circuits I should be
>>> aiming at ? I have just brought my first tacho
>> A minimum 1800rpm I'd say, but 2000 would be even better.
>
> WAY too slow for a 450 bird Beav. It'll fly, but it'll be very very
> sluggish and I'd be amazed if the tail held with the pitch needed to
> get it airborse at that RPM.
well I am running around 2100 if I hold the helicopter and measure, I
will need to find a way to strap the tacho to get a proper in the hover
reading and you are right it is sluggish but controllable

--
Kevin R
Reply address works

[The OTHER Kevin in San Diego]

On Mon, 21 Apr 2008 18:31:42 GMT, Kevin <dontemailme@ntlworld.com>
wrote:


>> WAY too slow for a 450 bird Beav. It'll fly, but it'll be very very
>> sluggish and I'd be amazed if the tail held with the pitch needed to
>> get it airborse at that RPM.
>well I am running around 2100 if I hold the helicopter and measure, I
>will need to find a way to strap the tacho to get a proper in the hover
>reading and you are right it is sluggish but controllable

IMO never a good idea to strap a heli down and run it up... Get a
buddy to tach while you hover.

[Kevin]

The OTHER Kevin in San Diego wrote:
> On Mon, 21 Apr 2008 18:31:42 GMT, Kevin <dontemailme@ntlworld.com>
> wrote:
>
>
>>> WAY too slow for a 450 bird Beav. It'll fly, but it'll be very very
>>> sluggish and I'd be amazed if the tail held with the pitch needed to
>>> get it airborse at that RPM.
>> well I am running around 2100 if I hold the helicopter and measure, I
>> will need to find a way to strap the tacho to get a proper in the hover
>> reading and you are right it is sluggish but controllable
>
> IMO never a good idea to strap a heli down and run it up... Get a
> buddy to tach while you hover.
>
>
>
none of my buddies will get anywhere near me in the hover :-) I would
not try the same trick with a 30 powered bird

--
Kevin R
Reply address works

[Steve R.]

"Kevin" <dontemailme@ntlworld.com> wrote in message
news:70tPj.61733$Ff4.6012@newsfe5-win.ntli.net...
> The OTHER Kevin in San Diego wrote:
>> On Mon, 21 Apr 2008 18:31:42 GMT, Kevin <dontemailme@ntlworld.com>
>> wrote:
>>
>>
>>>> WAY too slow for a 450 bird Beav. It'll fly, but it'll be very very
>>>> sluggish and I'd be amazed if the tail held with the pitch needed to
>>>> get it airborse at that RPM.
>>> well I am running around 2100 if I hold the helicopter and measure, I
>>> will need to find a way to strap the tacho to get a proper in the hover
>>> reading and you are right it is sluggish but controllable
>>
>> IMO never a good idea to strap a heli down and run it up... Get a
>> buddy to tach while you hover.
>>
>>
>>
> none of my buddies will get anywhere near me in the hover :-) I would not
> try the same trick with a 30 powered bird
>
> --
> Kevin R
> Reply address works


I've seen models that were strapped down to a table go into some significant
harmonics with "not good" results! :-o

You may be getting away with it with a 450 size bird but I have to agree
with Kevin on this one, you're asking for it! ;-)

As for the tach, the versions that Miniature Aircraft sells work very well
and you don't need to be that close to the model to use them. The only
downside is, they're not cheap, but they are very good!

FWIW! :-)

Fly Safe,
Steve R.

[Mike @ zen]

"The OTHER Kevin in San Diego" <skiddz "AT" adelphia "DOT" net> wrote in
message news:jfjp0419fkff01ggrnt0afd0vibdl0usob@4ax.com...
> On Sat, 19 Apr 2008 09:15:41 GMT, Kevin <dontemailme@ntlworld.com>
> wrote:
>
>>any idea what head speed for normal hovering and circuits I should be
>>aiming at ? I have just brought my first tacho
>
> 2800+
>
> The TR is a bit soft so lack or RPM on the big fan translates to lack
> of RPM on the little one...
>
> I run all my 450s at 3000 on the head. You can run woodies, but make
> sure they're balanced VERY well and replace if if they have any
> contact with anything but air.. Thankfully, I crash often enough I
> don't have to worry about a set failing due to fatigue. :)


Try this :-)
http://www.modelavionics.com/skytach.asp

[The OTHER Kevin in San Diego]

On Tue, 22 Apr 2008 21:45:39 GMT, Kevin <dontemailme@ntlworld.com>
wrote:


>none of my buddies will get anywhere near me in the hover :-) I would
>not try the same trick with a 30 powered bird

Get a MA SkyTach and they can be 100' away and still tach for you.

[Kevin]

The OTHER Kevin in San Diego wrote:
> On Tue, 22 Apr 2008 21:45:39 GMT, Kevin <dontemailme@ntlworld.com>
> wrote:
>
>
>> none of my buddies will get anywhere near me in the hover :-) I would
>> not try the same trick with a 30 powered bird
>
> Get a MA SkyTach and they can be 100' away and still tach for you.
>
thats a novel idea not sure you could tach when doing 3d though

--
Kevin R
Reply address works

[Steve R.]

"Kevin" <dontemailme@ntlworld.com> wrote in message
news:h77Qj.15752$244.7975@newsfe1-win.ntli.net...
> The OTHER Kevin in San Diego wrote:
>> On Tue, 22 Apr 2008 21:45:39 GMT, Kevin <dontemailme@ntlworld.com>
>> wrote:
>>
>>
>>> none of my buddies will get anywhere near me in the hover :-) I would
>>> not try the same trick with a 30 powered bird
>>
>> Get a MA SkyTach and they can be 100' away and still tach for you.
>>
> thats a novel idea not sure you could tach when doing 3d though
>
> --
> Kevin R
> Reply address works


Believe it or not, yes you can. If the model has a half way decent setup,
and the rpms aren't shifting all over the place, you should be able to get a
pretty close reading. We've done it many times!

[The OTHER Kevin in San Diego]

On Thu, 24 Apr 2008 21:40:29 GMT, Kevin <dontemailme@ntlworld.com>
wrote:

>The OTHER Kevin in San Diego wrote:
>> On Tue, 22 Apr 2008 21:45:39 GMT, Kevin <dontemailme@ntlworld.com>
>> wrote:
>>
>>
>>> none of my buddies will get anywhere near me in the hover :-) I would
>>> not try the same trick with a 30 powered bird
>>
>> Get a MA SkyTach and they can be 100' away and still tach for you.
>>
>thats a novel idea not sure you could tach when doing 3d though

Sure you can.. If the knucklehead on the tach can keep up with the
heli through the viewfinder and can manipulate the shutter speed at
the same time.

Easy? Not particularly..

Easiest would be something like an Eagletree with a brushless RPM
sensor.