Today's Message Index:
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1. 05:08 AM - Re: Static rpm - warp drive/912ULS (Thomas R. Riddle)
2. 06:43 AM - Re: Static rpm - warp drive/912ULS (John Hauck)
3. 08:59 AM - Re: Static rpm - warp drive/912ULS (lucien)
4. 07:48 PM - Re: Static rpm - warp drive/912ULS (lucien)
Message 1
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| Subject: | Re: Static rpm - warp drive/912ULS |
Out Allegro was pitched so that typically the 912UL ran around 4900
rpm during take-off run. In straight and level flight at full throttle
at our typical density altitude it would top out at 5500 rpm and about
125 mph TAS. I expect your Titan will be in this speed range too. The
faster the airplane the more difference you can expect between the
take-off run rpm and Vh rpm.
Our RANS has a fixed pitch (66x52) Tennessee climb prop so we get a
lot higher take-off rpm and can easily run past redline during cruise
if not paying attention, even at high density altitudes.
Thom in Buffalo
Message 2
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| Subject: | Re: Static rpm - warp drive/912ULS |
> Our RANS has a fixed pitch (66x52) Tennessee climb prop so we get a
> lot higher take-off rpm and can easily run past redline during cruise
> if not paying attention, even at high density altitudes.
>
> Thom in Buffalo
Is there a reason for leaving that prop on the Rans?
john h
mkIII
Message 3
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| Subject: | Re: Static rpm - warp drive/912ULS |
Thom Riddle wrote:
> Out Allegro was pitched so that typically the 912UL ran around 4900
> rpm during take-off run. In straight and level flight at full throttle
> at our typical density altitude it would top out at 5500 rpm and about
> 125 mph TAS. I expect your Titan will be in this speed range too. The
> faster the airplane the more difference you can expect between the
> take-off run rpm and Vh rpm.
>
> Our RANS has a fixed pitch (66x52) Tennessee climb prop so we get a
> lot higher take-off rpm and can easily run past redline during cruise
> if not paying attention, even at high density altitudes.
>
> Thom in Buffalo
Eeeyikes, 4900 strikes me as really lugging it.... That can't be good for the motor.....
Tho I guess if you have that wide of a speed range you probably don't
have much choice ?
My problem is our altitude so I need as much climb as I can possibly get for safety
reasons, even with our mile plus long runways.
With my FSII, I had that sucker turning 6300 on the takeoff roll and in climbout
about 6400. The plane was actually trimmed to fly at about 70 but I kept it
at 60 to 65 with about 5200 to 5400 cruise.
It could have easily overspeeded in level flight, but with a climb rate of about
300 fpm max, I was happy to have that baby putting out max power in a Vy climb
(which IIRC, was about 40 to 45mph?).
At approx 377 power levels, that was ok with me ;).
My current plane I'm perfectly content to cruise along at 90 or even 80 and don't
care a great deal about going really fast. I think it's the UL'er/Kolber in
me....
So I'll just have to see what I get in flight. Winds look low today so I may head
out and have a go here in a bit.
LS
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LS
Titan II SS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=234554#234554
Message 4
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| Subject: | Re: Static rpm - warp drive/912ULS |
Just in case anyone's interested in a PIREP on the Warp Drive,
I finally flew around the patch with the new WD. It really does work like a CS
prop! I don't recall this affect as much on my FSII, but on the 912uls it's very
noticeable. Everything in climb between 65 and 80 mph stayed between 5350 and
5420 rpm or thereabouts.
The pleasant surprise was on downwind, when I noticed I was at almost 95mph at
my usual throttle setting but was still only turning just under 5000. (normally
5100 with the IVO unless I add in more pitch). I'd usually just be breaking
85 if I held 5000.
So the speed range is quite a bit wider than the IVO which is really nice. The
performance is slightly better too, especially over a wider range of airspeeds
where it maintains a good load on the motor and good thrust.
The less rotating mass over the IVO is very noticeable, especially at idle which
is much smoother now.
Overall a very good upgrade so far. Still have to do more flying at cruise to see
what I got there...
LS
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LS
Titan II SS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=234623#234623
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