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HelicopterBeginners Corner › Advice Sought Before I Go Flying Today
09-07-2003 08:48 AM  14 years agoPost 1
nheather

rrKey Veteran

Horsham, West Sussex, UK

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I'm a beginner at hovering stage and have just revisted the setup of my links to improve the geometry and to change from 1/2 to 3/4 stick hover.

My question is about pitch range. At the moment my two blades have exactly the same total movement but with an offset of 1 degree.

Blade 1 -8.5 , +0.5 , +10.5
Blade 2 -9.5 , -0.5 , +9.5

Both measurements were taken on the same side of the heli (i.e. rotate head by 180), which should eliminate any slight error in level of the swash.

All links on the head are identical in length and angles of mixing, washout and bell cranks are are correct and consistent.

QUESTION is, should I adjust the links on the bench to remove this offset or should I leave as is and sort it out by tracking?

BTW: Before any comments made, I don't intend to fly with this pitch range. These are the full throws (without binding) but I will set up a pitch curve appropriate to my ability.

If you are reading this after Sunday 7th Sept, please ignore because I will have already made a decision and flown.

Cheers,

Nigel

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09-07-2003 09:41 AM  14 years agoPost 2
kauaison

rrApprentice

Alameda, CA

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I personally would adjust it on the bench, try to make sure each blade tracks evenly, and with the same pitch range, also with even travel on the servo horns too.... manual should tell u what links to adjust.

as a hint i would track each blade perfectly at your hover point (i.e. 6degrees) with a slight load (slight hand turn CC) so that all the links are binded tight and giving u better measurements. tracking has been perfect for me using this method

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09-07-2003 10:01 AM  14 years agoPost 3
nheather

rrKey Veteran

Horsham, West Sussex, UK

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kauaison

Thanks for the reply. Gosh you're up late/early!

Any idea what might cause this difference - is it common place?

I'm quite happy with the getting both blades the same, but to do so will mean making the paired links on the bell mixer unequal lengths which goes against the grain.

They are wood blades by the way. I was wondering whether the difference is down to inaccuracies in the blades.

Cheers,

Nigel

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09-07-2003 11:11 AM  14 years agoPost 4
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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Nigel, You have a pretty good handle on that beast! Congrats. Wood blades vary, as do all blades. Track on the bench as kauaison said, adjust the link as necessary. I always mark one blade grip with a white dot, naming this blade the "master" blade. When you trim the heli for the first time, move ONLY the other blade, to put them both in track. This way your 0º point is not moved.

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09-08-2003 07:25 AM  14 years agoPost 5
Hughes500Pilot

rrKey Veteran

Anaheim, CA

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As stated earlier, wood blades can vary quite a bit. But, as long as they are tracking properly, then you are good to go.

Also as stated above, I also desginate a "master blade" and make all adustments with that blade. Then, I simply adjust the other blade (the "slave blade") during tracking so it matches the "master blade."

Lastly, if you are just dying to know... You can take your mesuarments with your master blade and write them down. Then remove your master blade and put it on the other blade grip. Now adjust this side to make everything match the master blade side. At this point, everything should be equal since you are using the master blade on both sides.

Now remove the "master blade" and set it aside. Grab the "slave blade" and put it on the slave grip. Take new pitch readings while using the slave blade. Note that your readings might be different now since you are using the "slave blade." Write down it's settings - dont adjust anything... Just write the new settings down. Then, take that same slave blade and put it on the other grip. It should match the readings you just took on the other side. This will tell you for sure if it is in your blades aor in your rotor head.

-Steve

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09-08-2003 09:57 AM  14 years agoPost 6
nheather

rrKey Veteran

Horsham, West Sussex, UK

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Just to follow up ...

I adjusted the pitch on the bench to remove the offset as suggested.

Took it to the field and asked one of the experienced fliers to help with the tracking.

He had a look and reported that he didn't need to do anything - it was spot on. It then test flew it and without any adjustments at all demonstrated a 'hands-off' hover.

I flew (read hovered) the heli afterwards and it was so precise and stable compared with my previous setup.

It just goes to show that if you follow the instructions in Rays manual and the execellent advice from Runryder even a beginner can produce and excellent set up.

Thanks again,

Nigel

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