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Home✈️Aircraft🚁HelicopterThunder TigerRAPTOR 50 › weird problem
05-27-2007 05:06 AM  13 years ago
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joeyM

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langhorne, pa

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weird problem
a friend of mine has a raptor 50 and when he starts it up it seems to have some sort of glitch and wants to go to full throttle. he went to start it once and smoked the clutch. he dropped the engine to find that the liner was gone. he replaced the liner and put in a new clutch. He thought maybe the metal to metal contact was causing the glitch. after putting in a new liner and clutch, he still has the problem and cant figure out what it could be. he does have a revmax on it too. I had a problem similiar to that when I first used a revmax. i made sure the sensor got as close to the magnet as possible and the problem went away.
does anyone have any ideas to what might be causing this? has anyone had a similiar problem like this?......any ideas about what to look for whould be appreciated.......thanks.........joe
cq cq cq de ka3cnc 30 or 40 mtr cw
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05-27-2007 05:14 AM  13 years ago
Kevin Dalrymple

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Indianapolis

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Try it with out the Rev max hooked up. range check and look for glitches. If it passes then start the heli and see if it dose it with out the rev max. If not then check the setting on the revmax. It might need a stick calibration like on other govenors. Thanks.
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05-27-2007 06:11 AM  13 years ago
Toro

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Southern Cal

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dont underestimate the obvious....

Throttle is going in the right direction ? Their is no reason for it to go to full throttle other than a servo going bad, or it being reversed. The revmax if set up correctly should only come on when your throttle stick hits 25%.

Has the heli been succesfully flown before without throttle issues ?

Like the previous said, try running it without the revmax, and make sure the throttle is responding in the correct direction

J
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05-27-2007 01:26 PM  13 years ago
joeyM

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langhorne, pa

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the heli has been flown without the revmax and was ok--it was flown with the revmax and was ok for a while without any issues. its just after starting the heli and carrying it out to the middle of the field it will glitch and want to go to full throttle not constant full throttle just like you were pumping the collective...its really a scary situation..we are gonna look it over again today and see if we can find what is causing it.....cq cq cq de ka3cnc 30 or 40 mtr cw
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05-28-2007 04:24 AM  13 years ago
Toro

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Southern Cal

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sounds like a loose connection... Is it only the throttle doing it or do the cyclics inputs glitch too... If thats the case it receiver wide, if its only throttle its localizing to that channel. Could be bad servo, or A short in the wire, or revmax failing
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05-29-2007 07:36 PM  13 years ago
MasterCrash

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Gassaway, Tennessee

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joeym
does anyone have any ideas to what might be causing this? has anyone had a similiar problem like this?......any ideas about what to look for whould be appreciated.......thanks.........joe

It happened to me , after 3 toasted bottom bearings I figured out the sensor that gets close to the magnet took a poop.

The third connection had a hairline break in it, causing suddenly the onboard revmax computer to recieve no signals, and WAMM!!! full throttle, untill the vibrations happen to reconnect the bad hairline crack . That sensor looks like a transistor [though it probably isn't] and has three stems connecting to wires and as my luck would have it one of them was cracked and causing an open circut closing and opening at will.
www dot heliproz.com has replacement sensors for 25 bucks.

To TEST the sensor, turn everything on ACCEPT your motor [don't start it], With the motor off but your radio in idle up mode take off the Cap [heli body] Turn Reciever ON, and look at the revmax lights, by hand; SPIN the cooling fan[This is a pain some folks take the motor out for this test however I don't], and see if the top light blinks once for every revolution. This is at the point the mini magnet passes by the sensor. If it does Good!! But; your NOT out of the woods, if it doesn't blink STOP right here; your sensor or sensor connection is crapped. However if the light blinks , wiggle the sensor connectors and try a seiries of stress tests such as that and make sure you do not see intermittent results. if you do, toast the old sensor and by another one. This little bugger is tempermental and can work on the ground motor off, but after spooling up a bad connection can start interupting the "Cycle" count that the sensor is sending back to the computer, not enouph pulses per second and the computer will full throttle to get more.

One easy way to spin the fan I use is, Put your starter driver in the top touchhole and spin like you where starting it but NO NO!! make sure your glow plug isn't actvive like some high dollar models are.

The RevMax computer board light should blink once per revolution.

PS: I am an expert at changing bottom motor bearings now, Look at the silver lineing me lad look at the silver lining. :-)
And I thought that I Would never CRASH!!!
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