Fairchild Club Forum

'If anybody has taken the time to work this out, could I get Best
Angle / Best Rate for the F24R-46 with 200 ponies. I'd like to mark
my A/S indicator ?. my manuals are a little vague, saying to climb at
80/ 85 at full power for takeoff. Also a maneuvering speed would be
nice, right now I'm guessing around 100 or so?..thanks

Tom
Hanford,Ca'

'Tom:

> If anybody has taken the time to work this out, could I get Best
> Angle / Best Rate for the F24R-46 with 200 ponies. I'd like to mark
> my A/S indicator ?. my manuals are a little vague, saying to climb at
> 80/ 85 at full power for takeoff.

Having come to the 24 from more modern airplanes with more modern
manuals, Ive wondered myself about the values of Vx and Vy but havent
yet spent the time to collect the data and determine them myself.
The UC-61K manual suggests a sea level climb speed of 74 IAS at 2550
lbs. although its extrapolated from actual data at max gross (2882 lbs).

> Also a maneuvering speed would be nice, right now I'm guessing
> around 100 or so?.

If the limit load under CAR 3 is the same as Part 23 Normal category
(3.8g), that would make Va = 57 * square root( 3.8 ) = 111 IAS at
2562 lbs., so Im cruising below maneuvering speed.

:Dan Michael
:NC81323




[Non-text portions of this message have been removed]'

'You actually look at that thing?




--- In fairchildclub@yahoogroups.com, "Tom Mueller"
wrote:

>
> If anybody has taken the time to work this out, could I get Best
> Angle / Best Rate for the F24R-46 with 200 ponies. I'd like to mark
> my A/S indicator ?. my manuals are a little vague, saying to climb at
> 80/ 85 at full power for takeoff. Also a maneuvering speed would be
> nice, right now I'm guessing around 100 or so?..thanks
>
> Tom
> Hanford,Ca
>

'

'Hi Tom,

When I picked up my 24 with the C-5 engine I was checked out with the 80/85 airspeeds for climb and all seemed normal. When I brought it home I was being chased by my buddy in a 210 Swift. I knew he climbed at 100 to keep things cool so I attempted to do the same in the 24. I'll be darned if it didn't climb as well with at 100 as it did at 80/85.

When we got back we conversed about this and he said it was relatively normal with a fixed pitch prop as you get more horsepower. So I dug out my little white Ranger book and saw that at 2100 RPM you only get about 180 horses, while at 2400 you get just under the 200 rated horsepower. That extra 20 or so seemed to make a difference.

The engine was pretty sick when I bought it and I noted the other day that I get 2150 at 80+, but I was just hopping around the field and didn't go to 100 IAS.

So my conclusions in general are that if you have a cruise prop, climb at a higher IAS and you get more horsepressure. Either that or get an Aeromatic/Hartzell to get the horses galloping.

Just something to think about.

Remember the old SAC motto. Indecision is the key to flexibility.

Bob

----- Original Message -----
From: Tom Mueller
To: fairchildclub@yahoogroups.com
Sent: Wednesday, August 15, 2007 9:36 AM
Subject: [fairchildclub] Airspeeds..


If anybody has taken the time to work this out, could I get Best
Angle / Best Rate for the F24R-46 with 200 ponies. I'd like to mark
my A/S indicator .. my manuals are a little vague, saying to climb at
80/ 85 at full power for takeoff. Also a maneuvering speed would be
nice, right now I'm guessing around 100 or so...thanks

Tom
Hanford,Ca






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'

'I've owned six antique airplanes, & now have my first F24W. I am an A&P, IA & DAR & have substantial experience dealing with old airplanes, as I started with them in the Navy in the late '60s.
One thing I've always found that pays off when I get a plane I intend to keep for any time, is to remove & overhaul all the instruments & their aircraft systems. The instrument faces get discolored, the mechanisms haven't had lubrication or maintenance in half a century & the rubber tubing in static/pitot systems hardens & cracks in places you can't see. Most IA's on annuals don't check these either, but if you remove the tubes, they'll often crack & self destruct. When everything is open, be sure to blow out all instrument air lines from the instrument connection outwards towards the static/pitot ports too. Because of their age, most instruments are probably out of calibration as well.

Keystone Instruments at Lockhaven, PA are the best pros for OH'ing instruments. These old instruments have excellent movements & easily avail themselves to overhaul. They can silkscreen new faces that match original instruments perfectly.

Good Luck!
Steve Whelan

danMichael wrote:
Tom:

> If anybody has taken the time to work this out, could I get Best
> Angle / Best Rate for the F24R-46 with 200 ponies. I'd like to mark
> my A/S indicator ?. my manuals are a little vague, saying to climb at
> 80/ 85 at full power for takeoff.

Having come to the 24 from more modern airplanes with more modern
manuals, Ive wondered myself about the values of Vx and Vy but havent
yet spent the time to collect the data and determine them myself.
The UC-61K manual suggests a sea level climb speed of 74 IAS at 2550
lbs. although its extrapolated from actual data at max gross (2882 lbs).

> Also a maneuvering speed would be nice, right now I'm guessing
> around 100 or so?.

If the limit load under CAR 3 is the same as Part 23 Normal category
(3.8g), that would make Va = 57 * square root( 3.8 ) = 111 IAS at
2562 lbs., so Im cruising below maneuvering speed.

:Dan Michael
:NC81323




[Non-text portions of this message have been removed]




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