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Scorpion Power ProModeler
HelicopterThunder TigerOther › Newb Problems
12-20-2003 07:02 AM  13 years agoPost 1
JamesV

Senior Heliman

Savannah

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OK guys this is what i have. I have a Raptor 30V1. I have flown 3/4 a gallon of fuel through it with no problem. I was hovering one day and my gyro came unplugged. So of course I came spinning down about 4 feet to break tail rotor blades, vert fin, pitch slider, bend flybar, and tear covering on main blades. I get a crash kit, and replace the broken parts, new flybar, and blades. i have stock TT blades on it now. I havent balanced them, wasnt sure if they needed it or not. The heli spools up fine, then starts to vibrate and shake vilently. as its spooling down it continues wobbling. I did play wiht the radio a little bit and changed the pitch curves from the stock ones on the JR 662. Stock pitch and throttle curves are 0 50 and 100. I am not sure what they are now. They motor seems to be runing extremely fast. Could I e overspeeding the head for the amount of pitch I am using? I am confused? Shoudl I go back to the stock beginners recommendations liek the manual says? I would greatly appretiate it if you guys could help this newb figure out what the deal is. thanks

James VanHook
Performance Plus RC Rep
Phantomhobby.com

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12-20-2003 07:07 AM  13 years agoPost 2
JamesV

Senior Heliman

Savannah

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no, I didnt know how. I didnt get a blade strike or anything. I bent the flybar after the crash(dont ask) LOL SO if figured the main shaft was fine. The blades rack fine if that means anything. I also wasnt sure how to set the paddles also if that help. could the be off. They a reeven with each other. I am jstu throwing stuff out there to see fi that helps. thanks fr the quick reply

James VanHook
Performance Plus RC Rep
Phantomhobby.com

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12-20-2003 07:55 AM  13 years agoPost 3
JamesV

Senior Heliman

Savannah

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uh not really. I am going ot try my fiberglass blades. how do I align the paddles? I was jstu reading another thread on here with a guy that had the same problem, but I dont knwo why mine would start this all of a sudden. I need to look the thing over good. May have something loose, binding, bent, who knows.

James VanHook
Performance Plus RC Rep
Phantomhobby.com

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12-20-2003 01:21 PM  13 years agoPost 4
Har

Senior Heliman

Springfield MO

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I had a simlar issue after a dumb thumb. It once I removed the wood blades and put the fiberglass ones on the issues went away.

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12-20-2003 01:36 PM  13 years agoPost 5
Drunk Monk

rrProfessor

Preston, UK

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You should definately try to balance the blades to make sure they are the same, it only takes 5 mins and can save you a lot of headache in the long run. The way I align the paddles is to measure how far out they are on the flybar and make sure that they are both the same distance out, but you have to be pretty accurate and get them the same to the milimeter or less. Then hold the flybar level and level the swash plate and check to see if the paddles are level and straight. You can get special levels to check the paddles but to be honest if your only hovering then it won't make any difference. Another thing that would make it wobble is to have the head speed to high, you did say you've been playing with the pitch curves. Unless you have a tach it's pretty hard to get the right headspeed when your just starting out. You should also check the feathering spindle and main shaft. If you've lost the covering on your blades then you must have hit the blades on something so you could of bent the shafts. Just take them out and roll them on something really smooth, like a sheet of glass, and they should roll smoothly.

My money is on the balancing though, start simple and work your way up

Good luck


Stephen

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

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12-20-2003 01:41 PM  13 years agoPost 6
Buzzin Brian

rrProfessor

College Station, Texas

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First ballance the blades, and check the pitches. If you don't have a blade ballancer, it can be done without one. First find the CG (center of gravity). Use a straight round rod. I have found an Xacto knife with the end taken off to work well. Roll the blade on the rod on a smooth surface until the blade ballances on the rod. Mark the leading edge of the blade righ in the middle of the rod with a felt tip pen where it ballances. Repeat for the other blade. If the two marks are not in the same spot they will have to be adjusted until they do. Do this by putting tracking tape at one end or the other of the blade (tip or root) depending on which way you want to move the CG. I.E. the tape at the root will move the CG farther towards the root of the blade. You may have to adjust both blades to get the CG's together. When applying the tape make sure to stick it on the trailing edge and wrap it around the leading edge. Otherwise it will come off in flight. Try to keep from useing to much tape. Once this is done and the CG's match it is time to ballance them. Get a piece of all thread (a rod that is literally all threads) and two bolts that fit the threads. Put the all thread through both blades just like they were on the heli trailing edge down on one side leading edge down on the other. Bolt them together so the all thread is about equal length on both sides. Tighten them secure enough that the blades stay straight out on each side. Now take two drinking glasses and ballance them on the glasses useing the all thread. One glass on each side of course. Now you will have to use tracking tape to ballance the light blade if there is one. When applying the tape apply it on the CG of the light blade. You want the tape to be applied so the the line for the CG is in the center of the piece of tape. Again make sure you put the tape at the trailing edge of the blade going arround the leading edge. Once they ballance level they are ready to fly. Hope this wasn't to long winded, and was of some help.

Oh, and never run woodies, or any blade for that matter without checking the CG location, and ballance. Even composite blades can be off. And if you don't already have one, get a pitch guage. And ALWAYS check the pitches when you have changed blades. The values in the radio mean very little if the pitches are not checked with a pitch guage.

Build it, fly it, crash it. Repeat as often as needed.

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12-22-2003 04:21 AM  13 years agoPost 7
JamesV

Senior Heliman

Savannah

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OK, problem solved. thanks guys. I cant really tell you what I did to fix it but its solved. I Ran fiberglass blades, changed the feather shaft and main shaft, levled the paddles, and got the motor running better. I also re did my curves wwiththe help of a friend and got the head speed alot better. THanks for you guys help

James VanHook
Performance Plus RC Rep
Phantomhobby.com

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12-22-2003 05:57 AM  13 years agoPost 8
davea_hm

Heliman

Los Altos Hills, CA

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Just guessing causes

My guess is that you slightly bend the main shaft. It takes very little to bend the shaft if anything touches a blade while spinning. Forces are amazing at any speed over 1000 RPM. To check, put the main shaft in a drill press or hand drill and spin it. Any bend will be obvious. They can be straightened but it is not the easiest thing to do.

Running glass blades can make you lazy. I always balanced blades for many years but now high quality glass blades are never off (sounds like famous last words but I haven't been disappointed in 3 years). It is nice to be able to be lazy sometimes.

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