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1/2A Brodak Pathfinder question

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Old 08-04-2009 | 06:22 PM
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Default 1/2A Brodak Pathfinder question

Nice kit, but I have a few questions.

Very new to control line: The leadout are on this adjustable mount and the lead outs are ONLY 1/2" a part. My other plane is a baby clown and the leadout get twisted around each other so I went back in and spaced them further apart. My question is this, I want to space the leadout further apart but how much should I go. Any one out their flying this plane? Any problems with your leads twisting around each other?
Old 08-04-2009 | 09:23 PM
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Default RE: 1/2A Brodak Pathfinder question

On a 1/2A I have the leadouts come out one hole. I make one enough longer than the other so that they do not catch on the clips, etc. In a 1/2A, even 1/2 in separation will introduce a slight but noticable yaws whe you give control. 1/2 in will be OK, as you have to look for the yaw to see it.
Old 08-05-2009 | 03:55 AM
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Default RE: 1/2A Brodak Pathfinder question

The plane has a huge crank is 3.125 long, not sure if that changes anything? How does the spacing of leadout induce yaw? I would think that going from 3.125 from the bellcrank down to .5 leadout would cause alot of resistance
Old 08-05-2009 | 07:26 AM
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Default RE: 1/2A Brodak Pathfinder question


ORIGINAL: iflyg450
The plane has a huge crank is 3.125 long, not sure if that changes anything? How does the spacing of leadout induce yaw? I would think that going from 3.125 from the bellcrank down to .5 leadout would cause alot of resistance
Where the bellcrank is located is of little importance to yaw.

A 3.125 bellcrank is not huge...it gives better control than a 2" crank.

WHERE the leadouts exit the wing is the important part. Having them adjustable allows you to trim for best flight. Part of the "trimming " process is to move the leadout position for best performance. This position will change with different length, diameter, and type of lines you are using. I would suggest you do a search on trimming to better understand what you are trying to achieve with the trimming process.

BTW, welcome to CL flying!

George
Old 08-05-2009 | 07:58 AM
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Default RE: 1/2A Brodak Pathfinder question

I understant that being able to abjust the leadouts foward and aft is of great importance, but the the distance between the leadout is not adjustable and I was wondering if more spaceing between the leadout changes anything. How long should the leadout extend past the wing tip? I am really enjoyng control line. Also working on a scratch built VooDoo. Could you recomend a nice 35 size engine?

-Jason
Old 08-05-2009 | 11:31 AM
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Default RE: 1/2A Brodak Pathfinder question


ORIGINAL: iflyg450

...... and I was wondering if more spaceing between the leadout changes anything. ....

.....How long should the leadout extend past the wing tip?

......

-Jason
Spacing of the leadouts doesn't really have much effect - where they are located wrt the CG is more important

The leadouts should be long enough that full control doesn't try to pull a line clip through the wingtip - in other words, if you pull a leadout to full control one way, then pull the other to full control, neither one should "Bottom Out" on the leadout guide or the wingtip.

Old 08-05-2009 | 11:52 AM
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Default RE: 1/2A Brodak Pathfinder question

The distance between the two lines is important if you are trimming for Precision Aerobatics and are getting to that last little bit of performance before the big meet or the Nationals. Otherwise the stock part that is in the kit is sufficient. If it's one half inch in the kit, that is OK, just like Jim Thomerson above related.
Like another poster related, make sure that when you start flying the model, the leadouts are slightly behind the CG. Also a nice thing to have is a tip weight box so one can remove or add tip weight to trim the model.
Good luck, glad you are having fun.
Chris...
Old 08-05-2009 | 12:08 PM
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Default RE: 1/2A Brodak Pathfinder question

test
Old 08-05-2009 | 01:36 PM
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Default RE: 1/2A Brodak Pathfinder question

This little plane does have the weight box and the leadots are adjustable. The parts that make up the adjustment are junk. I plan on making up my own rig or just getting rid of it all together and have the leadouts in one position so the foward line is a bit behinde the CG. I am using a Norvel 061 should be plenty of power
Thank you for all the info!
Old 08-05-2009 | 02:02 PM
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Default RE: 1/2A Brodak Pathfinder question

Yeah, those little 061's are powerful. I'd try to save the adjustable parts and remake them into something that works. It' s so nice to adjust when you figure out what you want rather than being stuck with what you have!
Post pictures!
Chris...
Old 08-05-2009 | 02:32 PM
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Default RE: 1/2A Brodak Pathfinder question

I use 4 inch bellcranks in my 1/2A airplanes. If you are an AMA member you can find my Cheap Thrill article on the December 1998 Model Aviation. Back in the early 80's we used to have 1/2A stunt at contests in the Midwest and I flew it every chance I got. TD 049's on pressure.

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