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Old Apr 13, 2012, 10:28 PM
Registered User
Melb, Aus
Joined May 2008
54 Posts
Discussion
Wing area vs Elevator area

Don't know if here or the builder workshop is the right place to post, but

Is there an ideal ratio for wing area compared to horizontal stabilizer?
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Old Apr 13, 2012, 10:54 PM
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C₄H₁₀'s Avatar
United States, AK, Fairbanks
Joined Aug 2009
12,528 Posts
It depends on the type of plane and the flying style.

There are some basic ratios or rules of thumb that people have cooked up, but they're pretty much made to be broken.
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Old Apr 14, 2012, 01:50 AM
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elfwreck's Avatar
United States, CA, Oakland
Joined Dec 2002
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Hey now,
While there are plenty of variables for a average sport or stunt model with um, normal proportions. Twenty percent of the wing area minimum for stable flight. Average is twenty five percent and thirty is huge. Often race or speed models will have long fuses and not need so much control so they may get down to fifteen percent. The longer the tail the smaller the stab can be if you don't care much for aerobatics.
If you get much more than square in tail length you get so much stability you can't stunt. Notice that most pattern ships are square. That is the wing span and fuse length are the same. Much shorter you start to get twitchy. Much longer, no stunts. Get it? Other than that if it looks about right it'll fly about right.
Now. Get busy designing.
RobII
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Old Apr 14, 2012, 08:39 AM
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flypaper 2's Avatar
Kingston, Canada
Joined Jun 2004
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The full size Zero fighter had a relatively oversized stab. One of the reasons it was so agile and makes a good model.

Gord.
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Old Apr 14, 2012, 09:15 AM
It must have a machinegun
Scaledown's Avatar
Perth, Western Australia
Joined Sep 2004
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The smallest tail in my fleet is 15%. It flies OK. The rest are in the region of 20%.
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Old Apr 14, 2012, 10:12 AM
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JetPlaneFlyer's Avatar
Aberdeen
Joined Mar 2006
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Around 20% is typical for a 'normal' configuration.. But the tail area can vary from 0% (flying wing) to a several hundred % (canard).. and all points in-between.
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Old Apr 14, 2012, 01:20 PM
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Threshold's Avatar
London UK
Joined Jul 2004
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depends on the length of the fuz. Bewteen 20% to 25% and 12% for the vertical stab (tailfin and rudder) normal type plane.
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Old Apr 14, 2012, 03:55 PM
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PeTe,

Regards,

Hankg
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Old Apr 15, 2012, 03:02 AM
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Melb, Aus
Joined May 2008
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Thanks for the info, Ive had this design for awhile, but the tail never quite looked right to me, I do want it to do aerobatics so ...
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Old Apr 15, 2012, 06:13 AM
It must have a machinegun
Scaledown's Avatar
Perth, Western Australia
Joined Sep 2004
1,283 Posts
The tail looks fine but its a bit close to the wing. I would lengthen the rear fuselage by around 50%. Otherwise it will be very twitchy in pitch and you will find it hard to do smooth aerobatics.
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Old Apr 15, 2012, 07:49 AM
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Andy W's Avatar
Marietta, GA
Joined Jun 1999
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Suggest you study the plan view of multiple model types - sailplanes, pattern aircraft, 3D - and consider their flying styles while you're at it.
..a
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Old Apr 15, 2012, 09:33 AM
Grumpy old git.. Who me?
JetPlaneFlyer's Avatar
Aberdeen
Joined Mar 2006
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Quote:
Originally Posted by Scaledown View Post
The tail looks fine but its a bit close to the wing.
+1, it looks like a nice design but it is very short coupled. Typically the gap between the TE of the wing and the LE of the tail is at least 1.5 x wing chord. Short coupled planes can fly ok but longer coupling gives more stability.
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