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Other › Help with Setting Pitch Curve on Bell Hiller setup
11-22-2006 01:09 PM  11 years agoPost 1
Jagzilla

rrNovice

Chilliwack, B.C., Canada

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Hi,
I just joined up on this site, and look forward to participating on it. I'm pretty much a newby, I have a CP, and a MX 400 I haven't put together yet. My problem is:
I've put the bell hiller mixing arms on the CP. I can't seem to get the blades to go down to the correct pitch. I can get them to go up just fine, probably to around 10 or so degrees, but down only a degree or two. I play around with the turns on the rods, but doesn't seem to help. In idle up mode, and throttle at middle position, blades are about at 0 degree. The servos seem to be working fine, and I don't see any binding going on,but it just doesnt seem like the blades are changing pitch properly to me. Also, I put the wattmeter on it, and at full throttle, it only seems to be pulling around 4.5 amps, at roughly 50 watts. This also seems too low to me. This is the same on a few different batteries( 3 cell lipo w 9 tooth pinion). Any suggestions here? I can fly it like this, but it does seem underpowered and I just think I've got something out of whack here.
Jag

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11-22-2006 01:14 PM  11 years agoPost 2
Gino CP

rrKey Veteran

Philippines

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In idle up mode, throttle and trim should be set to middle or halfway. Rotor head should be in the middle of the hub. Adjust servo links so that head is in the right place.Then readjust pitch to zero.

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11-22-2006 04:16 PM  11 years agoPost 3
stickyfox

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Rochester, NY - US

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Your setup sounds normal. It's easy to set the BCP up with too much collective though. I recommend setting it so that you get just slightly negative pitch at mid-stick in idle-up. Are you leveling the flybar when you take these measurements?

To be honest, I have never put a gauge on my BCP. If the swashplate is correctly centered, there is no way you can mess it up (and no way you can get more pitch than the transmitter will let you), so there's really no need to know the pitch in degrees. If the swashplate is not correctly centered, it whacks into the center hub or retaining collar. I just look at the end of the blade and fine-tune by adjusting blade tracking.

If you have too much pitch, the BCP definitely will feel like it's underpowered. The tail will also be harder to control. It comes from excessive drag on the rotor blades.

Another hint: I've found that E-flite is not really consistent in their main shaft manufacturing processes. If you recently changed the main shaft you might have to adjust the links, or even move the swash, because they don't always drill that pin hole in the right place.

You might be worrying too much about the current draw. My BCP has an E-Flite 860 mAH battery on it. If I give it a constant 4.5A draw (on paper anyway), it'll last for about 11 minutes, which is pretty much what I usually get before I start losing voltage.

-fox

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11-22-2006 11:11 PM  11 years agoPost 4
Jagzilla

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Chilliwack, B.C., Canada

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I tinkered some more with it this morning. I ended up considerably shortening the two linkage arms, and that seemed to somewhat help. The swashplate is centered, and I have been holding the flybar level during my adjusting. I think the way it is now, is probably as good as I'm gonna get it. It does seem to be flying pretty good at the moment.
I'll keep an eye on the location of the sheer pin hole on the main shaft in the future. Thanks to both of you for your input.
Jag

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11-23-2006 07:54 AM  11 years agoPost 5
Micro-Maniac

rrElite Veteran

Pasco,Washington Formerly: Captain Chaos

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Here's how you go about a proper mechanical setup -

Disconnect both motors from the 3-in-1.
Turn on the TX - Switch to Idle-up - Center the throttle/collective stick.
Power the heli and look where the Rotor Head (034) is positioned on the Center Hub (008).
If the Head is not centered on the Hub then adjust the Servo Links (046) until it's centered and the Swash Plate (018) is level.
Now level the Flybar (003) and adjust the Pitch Control Links (006) until the Blades/Grips are also level with the Links 90° to the Bell Mix Arms (073).
Power off the heli and TX and switch back to normal mode and reconnect the motors.
Hover the heli and adjust blade tracking as necessary.

Important that all these coincide - Head centered on Hub (for pitch range) - Swash Plate level - Flybar level - Blade Grips level

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11-24-2006 06:36 AM  11 years agoPost 6
BLADE CP GUY

rrApprentice

Houston, Texas- USA

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I think I know how to do it!!

IF you need more lift and can't adjust the pitch anymore you can adjust the thing tha is attached to the servo arms...it's the three rods that is connected to the Swashplate...you can turn it down so that the servos can pull the Swash plate more down which would give you more pitch...Then You can adjust your pitch rod to maybe track the blades or adjust it into the right pitch...I hope this is help full....I discovered it myself and solve my porblem..because I was doing the same thing like you...untill my pitch rod disconecte bcoz its just not enough pitch or lift...but then I thought if the servos..and asked my self if the servos can pull more donw it would give me more lift even with zero pitch with my pitch rods....and then I found the Rods that is connected to the swash plate that I could adjust it down so that the servo can pull my swashplate more down and give me more lift.....See if it works!!!

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11-24-2006 12:26 PM  11 years agoPost 7
Jagzilla

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Chilliwack, B.C., Canada

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Blade CP Guy
Thanks for that info!! I think this is probably what I need to do on mine as well. I looked at playing with the servo travel myself, but since I hadn't heard anyone else suggesting it, I decided to leave them alone. I'll take a closer look at them now that I know this worked for you.
J

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11-24-2006 02:11 PM  11 years agoPost 8
BLADE CP GUY

rrApprentice

Houston, Texas- USA

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Aight cool man

JUst make sure when you adjust the servo rods that when you go Idle Up the Swash plate has still room to go up and down in the main shaft...

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11-24-2006 05:44 PM  11 years agoPost 9
Micro-Maniac

rrElite Veteran

Pasco,Washington Formerly: Captain Chaos

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That's what I said only not as windy and more accurately -
If the Head is not centered on the Hub then adjust the Servo Links (046) until it's centered and the Swash Plate (018) is level.
The range of motion the Head has on the Hub determines the pitch range - If the Head bottoms or tops out on the Hub before the blades reach their high or low pitch positions then the blades just aren't going to get there - So center the Head on the Hub to start with so the pitch has full and equal range of the Hub to work from.
Head centered on Hub (for pitch range)
The position and range of the Swash Plate itself is of no consequence - It doesn't matter one little iota - It's the position of the Head on the Hub that matters - The Swash Plate only translates the servo commands to the Head and Grips and it's position is determined by the Head via the non-adjustable Paddle Control Frame Pushrods (009) - So forget about where the Swash Plate is located and only concern yourself with it's levelness.

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