Trim Chart based on Article by Peter Goldsmith

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gareth.ky · 07-31-2008, 06:05 PM

I'm setting up a new airplane and I got off track on the trimming. Peter Goldsmith wrote a really great article on trimming airplanes but its long, and pretty dense. If you have never read it you should. I think I have read it 3 times now and its finally starting to sink in. My problem is I get to the field and I forget what to do and what I'm supposed to be looking for.

So I made a PDF that you can print out and take to the field. Give it to your caller and you can work on trim issues. The card is ordered in the same order that Mr. Goldsmith recommends. Its been seriously shortened to make it all fit on one page.

If anyone has any recommendations for improvement please let me know and I will work on it.

whaturi · 07-31-2008, 08:31 PM

That is so cool. Thanks for putting it up here.

snap · 07-31-2008, 08:44 PM

Awesome, I'm going to laminate it and put it in my new box (Thats fortunate enough to house a new JR12X) I guess now it's no more excuses,just me and the impending ground.lol

gareth.ky · 08-01-2008, 12:36 AM

Thanks guys, I'll keep working on the formatting.

The CG test that I have on the sheet is not the one that he recommends. He suggests using spin entry to test the CG. Scott Stoops in "Mastering Radio Controller Flight" suggests using inverted flight to test the CG (model should pitch nose down slightly and in upright flight it should do the same thing).

I cant find the source of the 45 degree upline test. I know I read it somewhere and I use it because you have time to think. You can let go of the sticks and just watch what the model does and have lots of time to recover. Spins and level inverted flight seem more risky on an untrimmed model to me.

Any ideas where I might have picked that up?

alfycat · 08-01-2008, 01:59 AM

That's helpful,
Thanks.

gareth.ky · 08-01-2008, 08:04 PM

I updated it just a little bit to make it clearer.

Rolling Thunder · 08-01-2008, 09:05 PM

	Quote: Originally Posted by gareth.ky
	Any ideas where I might have picked that up?

I heard it from QQ.

gareth.ky · 08-01-2008, 09:14 PM

	Quote: Originally Posted by Rolling Thunder
	I heard it from QQ.

Well that would be a good source

JLeyland · 08-01-2008, 11:05 PM

Nice work. Thanks.

gareth.ky · 08-05-2008, 03:24 PM

You're welcome.

Updated again:

Added lines between alternate maneuvers for the same step
Added a row for each possible bad behavior so you can just check stuff off.
Added check boxes for each "What to look for" that needs correcting
Added a blank area under each step for notes
Generally tried to cut down the number of words on the page
Switched over to Excel

Jim Woodward · 08-05-2008, 03:53 PM

Great Job! I had also written a short hand version of his article. His article is to my thinking and ability, is the best overall methodology for trimming a model aircraft that I have come across. I have used it for IMAC and F3A aircraft.
Jim

Al Lewis · 08-05-2008, 04:00 PM

Great job Gareth!! That's sure to benefit a lot of folks in this sport. Especially newbies!!

KTS · 08-06-2008, 10:37 PM

Ditto's on the Gratitude!

Sired by Fire · 08-07-2008, 01:02 AM

Nice job
... anyone have any ink for my printer?

Flatlandman · 08-07-2008, 01:41 AM

Thanx for the work Gareth

07-31-2008, 06:05 PM	#1
gareth.ky Caymanian Pirate Code Monkey Join Date: Jul 2006 Location: Mustang OK, USA Age: 31 Posts: 1,929	Trim Chart based on Article by Peter Goldsmith I'm setting up a new airplane and I got off track on the trimming. Peter Goldsmith wrote a really great article on trimming airplanes but its long, and pretty dense. If you have never read it you should. I think I have read it 3 times now and its finally starting to sink in. My problem is I get to the field and I forget what to do and what I'm supposed to be looking for. So I made a PDF that you can print out and take to the field. Give it to your caller and you can work on trim issues. The card is ordered in the same order that Mr. Goldsmith recommends. Its been seriously shortened to make it all fit on one page. If anyone has any recommendations for improvement please let me know and I will work on it. Attached Files PGoldsmithTrimming.pdf (56.2 KB, 1977 views) Trim Chart.pdf (343.4 KB, 1872 views) __________________ *Sawdust* is weight leaving the *airframe. Whether you think you can* or you *can't... your right. Last edited by gareth.ky; 08-07-2008 at 04:16 PM. Reason: chart updated*

07-31-2008, 08:31 PM	#2
whaturi Bad-ass Super Contributer! Join Date: Aug 2006 Location: Harrisburg PA, Age: 30 Posts: 1,077	Re: Trim Chart based on Article by Peter Goldsmith That is so cool. Thanks for putting it up here.

07-31-2008, 08:44 PM	#3
snap Bad-ass Super Contributer! Join Date: May 2006 Location: el cajon Age: 48 Posts: 563	Re: Trim Chart based on Article by Peter Goldsmith Awesome, I'm going to laminate it and put it in my new box (Thats fortunate enough to house a new JR12X) I guess now it's no more excuses,just me and the impending ground.lol __________________ "Mad Max IS the Michael Jordan of R/C" Team DW Foamie's

08-01-2008, 12:36 AM	#4
gareth.ky Caymanian Pirate Code Monkey Join Date: Jul 2006 Location: Mustang OK, USA Age: 31 Posts: 1,929	Re: Trim Chart based on Article by Peter Goldsmith Thanks guys, I'll keep working on the formatting. The CG test that I have on the sheet is not the one that he recommends. He suggests using spin entry to test the CG. Scott Stoops in "Mastering Radio Controller Flight" suggests using inverted flight to test the CG (model should pitch nose down slightly and in upright flight it should do the same thing). I cant find the source of the 45 degree upline test. I know I read it somewhere and I use it because you have time to think. You can let go of the sticks and just watch what the model does and have lots of time to recover. Spins and level inverted flight seem more risky on an untrimmed model to me. Any ideas where I might have picked that up? __________________ *Sawdust* is weight leaving the *airframe. Whether you think you can* or you *can't... your right. Last edited by gareth.ky; 08-01-2008 at 09:15 PM. Reason: spelling*

08-01-2008, 01:59 AM	#5
alfycat TARECOS AeroClub Join Date: Apr 2007 Location: Costa Rica Age: 41 Posts: 894	Re: Trim Chart based on Article by Peter Goldsmith That's helpful, Thanks. __________________ TARECOS AeroClub > San Jose - Costa Rica <

08-01-2008, 08:04 PM	#6
gareth.ky Caymanian Pirate Code Monkey Join Date: Jul 2006 Location: Mustang OK, USA Age: 31 Posts: 1,929	Re: Trim Chart based on Article by Peter Goldsmith I updated it just a little bit to make it clearer. __________________ *Sawdust* is weight leaving the *airframe. Whether you think you can* or you *can't... your right*.

08-01-2008, 11:05 PM	#9
JLeyland Uber Contributer Join Date: Jan 2006 Location: Doylestown, Pa Posts: 171 Awards Showcase Total Awards: 1	Re: Trim Chart based on Article by Peter Goldsmith Nice work. Thanks.

08-05-2008, 03:24 PM	#10
gareth.ky Caymanian Pirate Code Monkey Join Date: Jul 2006 Location: Mustang OK, USA Age: 31 Posts: 1,929	Re: Trim Chart based on Article by Peter Goldsmith You're welcome. Updated again: Added lines between alternate maneuvers for the same step Added a row for each possible bad behavior so you can just check stuff off. Added check boxes for each "What to look for" that needs correcting Added a blank area under each step for notes Generally tried to cut down the number of words on the page Switched over to Excel __________________ *Sawdust* is weight leaving the *airframe. Whether you think you can* or you *can't... your right. Last edited by gareth.ky; 08-07-2008 at 04:26 PM. Reason: grammar*

08-05-2008, 03:53 PM	#11
Jim Woodward Bad-ass Super Contributer! Join Date: Feb 2006 Posts: 1,128	Re: Trim Chart based on Article by Peter Goldsmith Great Job! I had also written a short hand version of his article. His article is to my thinking and ability, is the best overall methodology for trimming a model aircraft that I have come across. I have used it for IMAC and F3A aircraft. Jim __________________ Team Futaba / Dalton Aviation / Desert Aircraft / YS Parts & Service / Budd Engineering / Smart-Fly / Competitionairframes.com / Netbox Hobby

08-05-2008, 04:00 PM	#12
Al Lewis Bad-ass Super Contributer! Join Date: Nov 2007 Location: Port Orchard, WA Age: 61 Posts: 6,864 Awards Showcase Total Awards: 3	Re: Trim Chart based on Article by Peter Goldsmith Great job Gareth!! That's sure to benefit a lot of folks in this sport. Especially newbies!! __________________ http://www.southeastrcengines.com http://www.vessaero.com Remember every second of every day there are thousands of men and women giving of their lives to keep you safe. Never forget them for they never forget you!!

08-06-2008, 10:37 PM	#13
KTS That's Crazy Join Date: Feb 2006 Location: St. Louis, MO Posts: 129	Re: Trim Chart based on Article by Peter Goldsmith Ditto's on the Gratitude!

08-07-2008, 01:02 AM	#14
Sired by Fire Thread Killer Join Date: Nov 2006 Location: edmonton,alberta,canada Posts: 249	Re: Trim Chart based on Article by Peter Goldsmith Nice job ... anyone have any ink for my printer? __________________

08-07-2008, 01:41 AM	#15
Flatlandman Your my boy Blue!!!1 Join Date: Jan 2006 Location: Lexington Kentucky U.S.A. Posts: 4,209	Re: Trim Chart based on Article by Peter Goldsmith Thanx for the work Gareth __________________ Thanx to The Crew Mike B. Jim Z. Ed J. Jim S. Airman Wheels www.jerseymodeler.com lazertoyz.com

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