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HelicopterMain Discussion › which way to turn
03-31-2005 06:33 PM  13 years agoPost 1
earthmover

rrApprentice

Wellington (WPB) FL

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If I want to raise my lower blade to meet the higher on do I shorten or extend the link?

Raptor 50v2, os50 hyper, mp2, TJ Pro, Futaba 9CHPS PCM

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03-31-2005 06:39 PM  13 years agoPost 2
westwindpilot

rrVeteran

Glendale, AZ

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shorten.
steve

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03-31-2005 06:43 PM  13 years agoPost 3
dariof

rrVeteran

Henderson, NV / Laguna Niguel, CA

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Neither.

Depends on head speed / stick position.

Best Regards, Dario

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03-31-2005 06:49 PM  13 years agoPost 4
Leif

rrElite Veteran

USA

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Depends on a few factors:

How much thread-bite is available/used on the links?
Do you get enough total positive pitch out of the remaining blade?

Generally, if my overall pitch setting is OK, I opt to shorten the one link (if I can) as that way you don't run the risk of a link pulling off the rod. That said, the standard link setup on my Sceadu Evo is already almost bottomed out on every link, so in this case I would lengthen the appropriate link.

Leif

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03-31-2005 07:13 PM  13 years agoPost 5
earthmover

rrApprentice

Wellington (WPB) FL

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thanks... I guess its adjust... fly.... adjust.... fly

see ya

Raptor 50v2, os50 hyper, mp2, TJ Pro, Futaba 9CHPS PCM

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03-31-2005 07:16 PM  13 years agoPost 6
Drunk Monk

rrProfessor

Preston, UK

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Mark one blade and grip with a little cross, that way you know exactly which blade you are altering and also if you take the blades off you will be able to put them back on the same side. Fly the heli, shorten the long link, if the tracking is better then your going the right way, if not then lengthen it a turn. Just make sure you only alter one side, that's why you mark the grips


Stephen

I only open my mouth to change feet.....

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03-31-2005 07:28 PM  13 years agoPost 7
yugi

rrVeteran

Maryland

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Drunk Monk is right. One blade should be the master, set it at the pitch you want and adjust the other blade to the master.

Yugi

If you keep doing the same thing…...you’re going to get the same results!

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03-31-2005 07:39 PM  13 years agoPost 8
chris walker

rrApprentice

columbus ohio

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You can fix that with your pitch gauge. I set my pitch at 0* at mid stick on one blade then check my other blade and move the links from there so at mid stick they are both 0*, then when you go out to fly they are perfect, and the pitch is where you set it up at because if you just move the links when you are flying you will mess up your pitch curve. So if you were running 10 -10 you may have 12-8 after tracking the blades. Hope this helps.

CHRIS WALKER
IRCHA 2045 AMA 692136

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03-31-2005 08:06 PM  13 years agoPost 9
rusirius

rrNovice

Blades, DE - US

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Your always going to have some differences... Have you ever used a set of digital calipers to adjust your linkages? If you did you'd be amazed at just how "off" some of them can be... A turn either way is too much though.. You just have to settle for "close"... Not to mention there are some linkages that will always be anyway... The aileron linkages on a raptor for example... They turn at a 90 degree angle.. Since they are on opposite sides, they have to turn at OPPOSITE angles.... So you'll have a complete 1/2 turn difference between the two of them regardless of what you do...

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03-31-2005 08:11 PM  13 years agoPost 10
Drunk Monk

rrProfessor

Preston, UK

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That doesn't make any sense. Your altering the pitch on the blade to get the tracking right at hover. That's not going to make the pitch curve worse because it's already out because you have different pitch on each blade to start with. Pitch gauges aren't that accurate, you get it close enough then tweak a link at the field to get the tracking right. You can spend more time on the bench to get it perfect but it's not really worth the effort. Get one blade right with a pitch gauge, +- and zero pitch then get the other blade as close as you can, then tweak at the field if necessary.


Stephen

I only open my mouth to change feet.....

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03-31-2005 09:01 PM  13 years agoPost 11
MJWS

rrKey Veteran

Airdrie, AB - Canada

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Getting it right on the bench seems to work with good blades. I check both blades, fly it and they are perfect. Woodies, poor balance, warp all work against that.

If everything is leveled and centered the only links that do not effect head geometry are the short ones. So I would adjust those first, if you are close on the bench it really shouldn't take more than a turn or so to get them dialed.

As the good Monk says mark a blade or grip as the master, and adjust the other to match. Can't say I've ever had a preference to lengthen or shorten... look at the linkages and make sure they have lots of bite... if they are WAY out and or assymetrical you have problems elsewhere.

Good Luck, It will be second nature in no time.

Mike

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04-01-2005 01:37 AM  13 years agoPost 12
Hotwings

rrKey Veteran

Florida, West Palm Beach.

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hey earthmover, lets get together sometime next week, will be in town for the week, then going to sun-n-fun in lakeland for 10 days, c-ya ron ps call me on my cell.

Please cancel my clearance, I have the field in sight. Got my RW Turbine Waiver, need lottery!

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