How to trim a model  
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All Forums >> RC Airplanes >> Aerodynamics >> How to trim a model
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How to trim a model - 4/26/2008 2:01:14 PM   
karolh


 

Posts: 2149
Joined: 5/15/2002
From: Mandeville, JAMAICA
Status: online 		Could someone kindly give me a link to any good " How to trim a model " article. Thanks.

Karol
       Post #: 1

RE: How to trim a model - 4/26/2008 2:13:34 PM   
Scar



Posts: 2252
Joined: 10/1/2002
From: Peoria Hts, IL, USA
Status: offline
quote:

ORIGINAL: karolh

Could someone kindly give me a link to any good " How to trim a model " article. Thanks.

Karol


From IMAC:

http://www.mini-iac.com/EditModule.aspx?tabid=70&mid=476&def=News%20Article%20View&ItemId=27

From an NSRCA site:

http://www.rcaerobats.net/trim_chart.htm

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RE: How to trim a model - 4/26/2008 3:55:13 PM   
dick Hanson



Posts: 9858
Joined: 12/12/2001
From: slc, UT, USA
Status: offline 		If those don't drive you nuts - you have the patience of Job.
Trim Charts -wer originated by those trying to arrive at the "perfect model" which literally flew it's self thru various attitudes .
Once this is all perfect - try flying it in a wind -
you will likely find that you MUST fly the model constantly as the perfectly nuetral model has directional stability problems.
But go thru the exercize - it is a good learning experience
when done - find the setup comfortable for you
typically a slight forward balance to encourage directional stability will suit most setups.

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RE: How to trim a model - 4/26/2008 6:36:59 PM   
karolh


 

Posts: 2149
Joined: 5/15/2002
From: Mandeville, JAMAICA
Status: online 		Dick,

Thanks for that insight as I will certaintly try to achieve a position that I am most comfortable with.

Karol

(in reply to dick Hanson)
       Post #: 4

RE: How to trim a model - 4/26/2008 6:51:47 PM   
BMatthews



Posts: 8796
Joined: 10/4/2002
From: Burnaby, BC, CANADA
Status: offline 		What sort of model are you trying to trim out? A trainer requires a more forward balance point than an aerobatic model in order to be more stable for a new pilot.

EDIT- I just went to Google in put in model airplane trimming and got back a lot of good looking hits on the first two pages of listings. Two of them were the links above. Some others were more for general and training style models and they all have something to offer. Do the same search and read through those pages.

Also check out the links in the sticky threads at the top of the listings on this Aerodynamics forum as well as the Scratch Building forum for links to sites with information and calculators to help you determine your CG location.

< Message edited by BMatthews -- 4/26/2008 6:59:49 PM >


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RE: How to trim a model - 5/2/2008 10:07:00 PM   
mjfrederick


 

Posts: 503
Joined: 8/18/2006
From: Baton Rouge, LA, USA
Status: offline 		Check out this link. This is an article written by Bryan Hebert and myself (mostly Bryan, I just translated for those who don't speak coon-a$$). Bryan's models are some of the best-flying airplanes I've ever seen... neutral in all apects of flight. Triangulation Trimming

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RE: How to trim a model - 5/3/2008 6:45:48 PM   
karolh


 

Posts: 2149
Joined: 5/15/2002
From: Mandeville, JAMAICA
Status: online 		That's an excellent article and thanks for the link.

Karol

(in reply to mjfrederick)
       Post #: 7

RE: How to trim a model - 5/3/2008 7:05:03 PM   
Nathan King



Posts: 1300
Joined: 5/29/2007
From: Omaha, NE, USA
Status: online 		Those articles are good, but there's one thing I will add. Most people think trimming is a one time deal, but this is simply not so. I have airplanes many years old that I still tweak a little here and there just to get that seemingly elusive 'perfect' feel. Most people don't realize just how misadjusted their airplanes are until they fly something that's been painstakingly set up. Even my old trainer feels really 'locked in' after I took the time to make those almost imperceptably small adjustments.


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(in reply to karolh)
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RE: How to trim a model - 5/8/2008 7:57:03 PM   
karolh


 

Posts: 2149
Joined: 5/15/2002
From: Mandeville, JAMAICA
Status: online 		When I use to fly 40 size glow models, apart from doing a CG check as per the plans all model trimming was done via the Tx trim tabs for level and straight ahead flight. Now that I have progressed to flying larger models and now know the benefits of proper flight trimming I realize that it is essential as a well trimmed model is a joy to fly.

Karol

(in reply to Nathan King)
       Post #: 9

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