course. Where I live, that's useful.
TCS
Question with Boldness -- Thomas Jefferson
Hold to the Truth -- George Washington
Speak Without Fear -- Martin Luther King
Terry C Savage
Senior Information Technology Manager
Science Fiction Author
The End of Winter
Circle of Fire
<http://tinyurl.com/end-of-winter-savage>
http://tinyurl.com/end-of-winter-savage
http://tcsendofwinter.blogspot.com/
<http://tcsendofwinter.blogspot.com/>
====================================
_____
From: Titanaircraft@yahoogroups.com [mailto:Titanaircraft@yahoogroups.com]
On Behalf Of ls78705
Sent: Tuesday, December 01, 2009 5:57 PM
To: Titanaircraft@yahoogroups.com
Subject: [Titanaircraft] Re: Any Tornado S or SS for sale in US or Canada
--- In Titanaircraft@ <mailto:Titanaircraft%40yahoogroups.com>
yahoogroups.com, "Kess Blaswich" <kessb@...> wrote:
>
> Hmmmm. . . . . ........, now you have me wondering about trading my Ivo
prop for a Powerfin, now that they are back in business. Is the Ivo a ground
adjustable, or in flight adjustable? Until my electic drive quit on the Ivo,
and I converted it back to ground adjustable, I thought that it was the best
thing going, but I found myself not using the coarse setting very much
without bogging the R-503 and a 68" 3-blade on a 'C' 3:1 gearbox. Now I have
trimmed my prop down to 66" as per Ivo tech rep.
>
My IVO had the electric adjust but its demise is a long story. I originally
replaced it with a Warp Drive, which had spectacular high-speed performance,
but it also had a bad harmonic that I was never able to successfully treat.
In the interest of long-term safety I had to pull it and I replaced it with
the PF.
The powerfin is a more conventional type of prop, with stiff, big,
lightweight blades using a clark Y airfoil.
So, it's more of heavy pusher type prop with a narrower speed range, unless
you go with a smaller diameter. But nothing makes the cows get smaller
faster than a powerfin. I've used them for years and I think they're my
favorite prop of all - the engines/gearboxes love them because they're so
light and they push like all get out.
But they're not too good for a wide speed range. The Warp Drive is what you
want for that, especially the taper-tip. It works virtually like a constant
speed prop. And ironically, the IVO is also a really good prop for a wide
speed range especially if you run it as a 2 blade.
> Still wondering about the best prop. Faster is always better!!
For going fast, the Warp Drive is the way to go, followed closely by the
IVO.
So if you want to go fast, you probably already got the prop you want. The
IVO is already great for going fast....
I'm an altitude/go "up" man who likes to spend more time in the plane so I
go for heavy pushers when I have a choice (so I love PF's). But for going
fast, I'd say what you have is already about as good as you can get.
LS
> Kess
>
>
>
> ----- Original Message -----
> From: ls78705
> To: Titanaircraft@ <mailto:Titanaircraft%40yahoogroups.com>
yahoogroups.com
> Sent: Tuesday, December 01, 2009 3:59 PM
> Subject: [Titanaircraft] Re: Any Tornado S or SS for sale in US or Canada
>
>
>
>
>
> --- In Titanaircraft@ <mailto:Titanaircraft%40yahoogroups.com>
yahoogroups.com, "Roger" <rtracy@> wrote:
> >
> > Having done my transition familiarization with JD in
> > your plane I can say ... keep it .. it's a rocket ship
> > and it's roomy. And it's nicely built.
> >
> > RT
> >
>
> Oh yeah that's right. I keep forgetting you've flown this one, never mind
;).
>
> It actually is even more of a rocket in the "up" dept. now with the
powerfin fitted. It already climbed like nertz with the IVO but it's almost
200fpm better with the powerfin (I'd say 150fpm average better climb over
the IVO).
>
> It's a little slower in the forward dept. now, but the good thing about
that is you're in the plane longer when going somewhere.....
>
> Gas consumption also dropped to right at 3gph at 85mph indicated at
9500-10000' MSL, so it's a little cheaper to fly as well ;)
>
> LS
>
>
>
>
>
>
> ----------------------------------------------------------
>
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.426 / Virus Database: 270.14.88/2538 - Release Date: 12/01/09
07:59:00
>
>
> [Non-text portions of this message have been removed]
>
[Non-text portions of this message have been removed]
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