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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Problem with pitch range on my hawk sport
04-29-2004 12:38 AM  13 years agoPost 1
Smokecover

rrNovice

Norfolk Va.

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I have -6 degrees pitch with the stick all the way up. I've checked and double checked the pushrod lengths to make sure they are what the book calls for. It looks like I need to lengthen the pushrods from the bell mixer arm to the swashplate. I've got the lower control arms adjusted so the If only some adjustment is necessary, whets the best way to re-adjust? Do I simply adjust to get the top pitch I need and then go with that, or do I adjust it so I get the mid stick pitch right by mechanical means and adjust the outer ranges later? Or maybe there is a better way I dunno. I have the bellcranks at 90 degrees and sighting through they both match up nice and clean. Same thing with the elevator assembly.

In reality, learning something new always seems to go down as learning what not to do next time.

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04-29-2004 03:39 AM  13 years agoPost 2
Gearhead

rrMaster

Vt

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check your pitch ATV on your Tx, they should be set at 100%, then reply and let us know, another thing to look at is how far-out is the ball on the pitch servo, and make sure you have your linkage on the right balls on the bell mixers (flybar linkage goes on the long ball),,,

setup,,,
if your just flying around then it's OK to setup normal mode first, set 5&1/2 degrees of pitch for hovering when the throttle stick is at mid stick and your throttle curve is at 50%, then set for full throttle = 9 degrees, then set 3 degrees on the bottom for landing, now smooth out the rest of the curve,,,


if your more of an advanced flyer,,,
I setup idle-up 2 first, 0 degrees at mid stick (50%), 8&1/2 on top and 8&1/2 on the bottom,,,

now idle-up 1, 5 on the bottom, 5 in the middle, and 8&1/2 on top...

remember, you could fly 100 other guys helis and they all may be setup different !!


Jim

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04-29-2004 04:57 AM  13 years agoPost 3
Smokecover

rrNovice

Norfolk Va.

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All atv's re still set at factory default 100%. I have just gotten all the balls on the the horns at the correct locations and set the center points so far and was then going to go back and set atv's. The pitch servr has the ball 10 mm center to center from the middle of the servo, straight up at center stick. I know I gotta have something wrong for it to be off this much but its racking my brain trying to figure it out.

How can I post a pic of what I have here?

In reality, learning something new always seems to go down as learning what not to do next time.

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04-29-2004 05:13 AM  13 years agoPost 4
Gearhead

rrMaster

Vt

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hmmmmm,,, (at full throttle stick) what is your pitch curve set at ??

did you check your bell mixers linkage ??

Jim

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04-29-2004 05:26 AM  13 years agoPost 5
Smokecover

rrNovice

Norfolk Va.

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Ive checked those linkages prolly 5 times. They are 97 mm. I havent checked the default pitch curves yet but trying to figure that out now. It's a new radio-rd8000. My other radio had a problem with non-functioning atv's on throttle that i couldnt make work with the heli.

In reality, learning something new always seems to go down as learning what not to do next time.

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04-29-2004 05:37 AM  13 years agoPost 6
Smokecover

rrNovice

Norfolk Va.

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pitch curves are default 0-50-100 with a max of 125%. That aint gonna get me there I dont think. I have a linkage screwed up somewhere or the manual has a bad measurement in it. I dont think its any of the lower stuff cuz they have to be correct in relation to the elevator linkage assembly which has no real adjustments that I can see. The swashplate is sitting nice and level with sticks centered.

In reality, learning something new always seems to go down as learning what not to do next time.

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04-29-2004 06:21 AM  13 years agoPost 7
JKos

rrProfessor

Redondo Beach, CA

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OK, really silly question here, but... Do you have the blades on the proper direction? If you have them backwards, then you would actually be measuring what is suppose to be the negative pitch range and would also have the collective servo reversed.

What measurement do you get with the stick all the way down?

- John

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04-29-2004 12:01 PM  13 years agoPost 8
Smokecover

rrNovice

Norfolk Va.

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Not a silly question I'm obviously doing something wrong here just dunno what it is. Blades are on so standing at blade tip the leading edge of that blade is to my left. My negative pitch at full down is -16 degrees. Even if the blades were on backwards I still wouldnt have the right range I need for full posotive and negative pitches would i? The elevator control and aileron bellcrank assemblies cant go any higher at full stick up because the dang near touch the frame at that point so now I can completely rule that out as any part of my problem I think due to mechanical limitation.

In reality, learning something new always seems to go down as learning what not to do next time.

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04-29-2004 12:21 PM  13 years agoPost 9
Smokecover

rrNovice

Norfolk Va.

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Ok next step to try to confirm correct without disassembly. At full stick up there is about 8 mm between the top of the washout hub assembly and the bottom of the rotor head. About 2/3 of the exposed main shaft is turned the smaller diameter for the rotor head. I'm not sure how far down the the hole in the main shaft is but it could be possible that I ran the bolt through completely over top of the main shaft since the shaft has another 1/4 inch of room for the head assembly to slide down on.

In reality, learning something new always seems to go down as learning what not to do next time.

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04-29-2004 12:39 PM  13 years agoPost 10
SteveH

rrProfessor

Texas

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Smokecover,

Alexander's picture and instructions are correct, as are Wasp's. The one thing I would add is, with the throttle/collective stick all the way up, you should have the bellcrank shaft almost if not all the way to the top of the slot in the upper mainframes. If you do not have the bellcrank shaft all the way up in the mainframe slots, adjust the rod from the collective servo to the collective lever until you do. Sometimes the collective lever even gets bent and that makes it even harder to get the collective range you need, so check to make shure that has not happened.

The government cannot give you anything without first taking it from someone else.

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04-29-2004 12:41 PM  13 years agoPost 11
Smokecover

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Norfolk Va.

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OK I like that pic. Thanks Alexander. At zero collective the mixers should be lever on a horizontal plane then right. I'm not even getting that at full stick up and was wondering if they should be level at zero degrees pitch. To get the necessary high pitch point I will need would require lengthening the bell mixer to swashplate rods by about 8mm and thats way off from factory default lengths. I think I have the rotor head bolt entirely over top of the main shaft and not through it. I'll check that first and then if its right I'll start adjusting the pushrods to get where I need to be. I really cant see the manual having the lengths of the pushrods 8 mm off.

In reality, learning something new always seems to go down as learning what not to do next time.

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04-29-2004 01:06 PM  13 years agoPost 12
Smokecover

rrNovice

Norfolk Va.

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OK prolem solved, I had the bolt run through over top of the main shaft. It's close to level at center stick now. I appreciate the help fellas and now time to go to work I'm late from playing wih toys

Thanks again, Mark

In reality, learning something new always seems to go down as learning what not to do next time.

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04-29-2004 06:05 PM  13 years agoPost 13
JKos

rrProfessor

Redondo Beach, CA

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Mark,
If it makes you feel any better, you are not the first nor will you be the last person to make that mistake.

I was told of one locally that made it all the way through pre-flight and was being carried out to for its maiden flight when the head came off. . Somehow he had made the pitch range work and everything.

- John

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04-29-2004 06:15 PM  13 years agoPost 14
Gearhead

rrMaster

Vt

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sssshhhoo,,, that was a tough one, I had no idea what the problem was, I was just about to say move your ball out farther on the pitch servo arm,,,,

oh, that bolt thing, I did that once while rebuilding, thank God I caught it, I guess I should have remembered...

Jim

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04-29-2004 08:42 PM  13 years agoPost 15
Smokecover

rrNovice

Norfolk Va.

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Hey thats life live and learn right. My sig says exactly what just happened in this case and those are the best learning experiences to me. Man I checked and checked and checked linkages before I made this post, and after Alexander posted that pic of the mixers at half stick it was pretty easy to figure out. I can assure you its not a mistake I will ever make again the way it racked my head for the last 2 days. I was going to lengthen the linkages more than once knowing I could get into the range I needed by doing so but i knew I had to have something wrong if I had to lengthen them by 8mm. Hmm, now wouldn't that have been a memorable maiden flight? Thanks for bailing me out again fellas I really appreciate it alot.

BTW John, I've been carrying this thing everywhere by the head. Down the stairs to the garage, back upstairs at night to do a little more to it when I have time etc. I have also run 3 full tanks through it with just the paddles on breaking the engine in. It could have been really ugly cuz I don't think the head would have ever come off carrying it around.

In reality, learning something new always seems to go down as learning what not to do next time.

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04-30-2004 01:47 AM  13 years agoPost 16
RICH.L

rrKey Veteran

east springfield p.a.

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i don't understand,when i first set mine up i had the same problem,i tried everything and ended up lengthening that long rod between the bell mixer and swash plate.i am at 107mm on that rod and i have 3/4 tank through it and it is flying great,handles great.if i try to shorten it then my collective arm bottoms out at top end.i was doing funnels,fast forward flight,and hovers great.i guess i will just leave it there until i dumb stick it and crash.
rich

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04-30-2004 03:07 AM  13 years agoPost 17
Smokecover

rrNovice

Norfolk Va.

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Rich L, if you look at the mainshaft under the head assembly and see a ridge where the shaft gets a little smaller in diameter then the head isn't down all the way and the bolt is not going through the shaft. I thought I had it all the way down when I first put it together but I was wrong and knew I had something wrong but it took me 2 days to figure it out. Look for that ridge on the mainshaft under the head assembly between the 2 giude pins that stick down and if you have it take it apart and push the head assembly down another 3/8 inch

In reality, learning something new always seems to go down as learning what not to do next time.

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04-30-2004 12:51 PM  13 years agoPost 18
RICH.L

rrKey Veteran

east springfield p.a.

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i meant to say i had 3/4 of a gallon through it,not only that but this is the second mainshaft i put on this hawk.and two weeks ago when i put it on it went on so far and then i felt it go down even more.if it wasn,t right i think it would have come apart by now.at o pitch my washout arms are not level all the way across,maybe that is where i goofed up.all the other arms are level. rich

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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Problem with pitch range on my hawk sport
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