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Old September 12th, 2013, 11:22 AM   #1
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Question Straight Tail vs. Slant Tail Cessna 172

Hello, It has been my experience that the 1956 - 1959 Cessna 172 straight tails (especially the 57 model) take less ground roll (as much as 400 feet) than the early 60's models when they first introduced the swept tail. All have the 0300 engines.

Other than the swept tail the main difference is that in 1958 the landing gear was moved aft by three inches. Any one else experience this or is it just the particular planes that I happen to fly. Engine time has been about the same on each plane.
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Old September 12th, 2013, 11:25 AM   #2
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Re: Straight Tail vs. Slant Tail Cessna 172

earlier ones are probably lighter
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Old September 12th, 2013, 11:37 AM   #3
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Re: Straight Tail vs. Slant Tail Cessna 172

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Originally Posted by tonycondon View Post
earlier ones are probably lighter
They had less equipment installed, and a lesser profile drag.
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Old September 12th, 2013, 11:40 AM   #4
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Re: Straight Tail vs. Slant Tail Cessna 172

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Originally Posted by Sky21 View Post
Hello, It has been my experience that the 1956 - 1959 Cessna 172 straight tails (especially the 57 model) take less ground roll (as much as 400 feet) than the early 60's models when they first introduced the swept tail. All have the 0300 engines.

Other than the swept tail the main difference is that in 1958 the landing gear was moved aft by three inches. Any one else experience this or is it just the particular planes that I happen to fly. Engine time has been about the same on each plane.

I wonder if there might be a more favorable CG in one vs the other, that reduces the drag induced by the horizontal stabilizer.
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Old September 12th, 2013, 11:46 AM   #5
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Re: Straight Tail vs. Slant Tail Cessna 172

I wonder if there might be a more favorable CG in one vs the other, that reduces the drag induced by the horizontal stabilizer.

It very well could be. I'm comparing a 1957 to a 1960 mainly which both have about the same weight.
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Old September 12th, 2013, 11:49 AM   #6
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Re: Straight Tail vs. Slant Tail Cessna 172

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I wonder if there might be a more favorable CG in one vs the other, that reduces the drag induced by the horizontal stabilizer.

It very well could be. I'm comparing a 1957 to a 1960 mainly which both have about the same weight.

Prop pitches? Rigging differences? Venturis? Wheel pants? Empty Weights? CG?

There's a lot of factors to consider.

One could have a climb prop and the other a cruise prop. That would be very noticeable in ground roll.
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Old September 12th, 2013, 11:56 AM   #7
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Re: Straight Tail vs. Slant Tail Cessna 172

Both planes have the same prop, same venturis, took the wheel pants off of both, empty weight almost the same and as far as I know the cg is the same. I have flown several 1957 and 1960 models and always get off the ground better in the 57 over the 60.
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Old September 12th, 2013, 01:03 PM   #8
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Re: Straight Tail vs. Slant Tail Cessna 172

Welcome to PoA! Where are you located in Georgia? I'm assuming that's the state and not the country...
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Old September 12th, 2013, 01:06 PM   #9
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Re: Straight Tail vs. Slant Tail Cessna 172

[QUOTE=Sky21;1255461]Both planes have the same prop, QUOTE]


Yes, but same part # of prop doesn't mean they are pitched the same, same thickness or exact same performance. if both props were brand new, pitched the same and never dinked with then yes.

Timing on one could have been restricted due to an AD on certain cylinders, and the other plane doesn't have those cylinders.

Carb setup and induction leakage another factor. Are the compressions on both the same?

Last edited by bnt83; September 12th, 2013 at 01:10 PM.
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Old September 12th, 2013, 01:21 PM   #10
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Re: Straight Tail vs. Slant Tail Cessna 172

http://www.aopa.org/News-and-Video/A...overhauls.aspx
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Old September 12th, 2013, 02:54 PM   #11
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Re: Straight Tail vs. Slant Tail Cessna 172

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Welcome to PoA! Where are you located in Georgia? I'm assuming that's the state and not the country...
Thanks for the welcome. Yep the state. We are in the Northwest Georgia mountains.
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Old September 12th, 2013, 02:59 PM   #12
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Re: Straight Tail vs. Slant Tail Cessna 172

[QUOTE=bnt83;1255531]
Quote:
Originally Posted by Sky21 View Post
Both planes have the same prop, QUOTE]


Yes, but same part # of prop doesn't mean they are pitched the same, same thickness or exact same performance. if both props were brand new, pitched the same and never dinked with then yes.

Timing on one could have been restricted due to an AD on certain cylinders, and the other plane doesn't have those cylinders.

Carb setup and induction leakage another factor. Are the compressions on both the same?

Both props were new the 7651 climb version by McCauley. Compression close to the same. Carb and timing has been checked. Just seems like the straight tail wants to fly more than the slant tail. Just wondering if anyone else has had this experience. Thanks for all the comments.
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Old September 12th, 2013, 02:59 PM   #13
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Re: Straight Tail vs. Slant Tail Cessna 172

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Thanks for the welcome. Yep the state. We are in the Northwest Georgia mountains.
Nice! I'm stuck in the ATL 'burbs. It's where the job is...
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Old September 12th, 2013, 03:03 PM   #14
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Re: Straight Tail vs. Slant Tail Cessna 172

[QUOTE=Sky21;1255651]
Quote:
Originally Posted by bnt83 View Post


Both props were new the 7651 climb version by McCauley. Compression close to the same. Carb and timing has been checked. Just seems like the straight tail wants to fly more than the slant tail. Just wondering if anyone else has had this experience. Thanks for all the comments.

Wait a second, you said the gear location is 3 inches different between them? I'm guessing the CG is closer to gear on straight tail meaning less force is required to lift the nose at rotate speed and easier lift off.

How full is the nose strut between the two?
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Old September 12th, 2013, 03:06 PM   #15
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Re: Straight Tail vs. Slant Tail Cessna 172

[QUOTE=bnt83;1255655]
Quote:
Originally Posted by Sky21 View Post


Wait a second, you said the gear location is 3 inches different between them? I'm guessing the CG is closer to gear on straight tail meaning less force is required to lift the nose at rotate speed and easier lift off.

How full is the nose strut between the two?
Because we fly off of a grass field I always keep the nose strut up a little more than normal.
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Old September 12th, 2013, 03:08 PM   #16
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Re: Straight Tail vs. Slant Tail Cessna 172

[QUOTE=Sky21;1255658]
Quote:
Originally Posted by bnt83 View Post

Because we fly off of a grass field I always keep the nose strut up a little more than normal.

I think the elevators are the same but they may not be, which would influence control feel. If the control cables are on the tight side, it can make a plane feel heavy IHMO.
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