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Home✈️Aircraft🚁HelicopterAerial Photography and Video › Best method to stop heli from spining during take off with a Underslug mount??
06-19-2009 04:39 AM  11 years ago
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jascamera

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san francisco, ca

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Best method to stop heli from spining during take off with a Underslug mount??
I in the process of designing my own Under slug mount. I am thinking of using the torque from 2 servos to control the pan axis to stop, or minimize the heli spinning effect during take off.

What do you guys think about dual servo on pan and are there a better method? I don't think I like the spring lock set up.

I am also thinking of instead, maybe using the second servo on the pan axis to trigger a lock, but haven't figure out a solution yet.

Jason
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06-19-2009 04:46 AM  11 years ago
rroback

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Irvine (UCI), Ca

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The problem is when the servo is modified ( and has no pot). Without a pot, if the servo is overpowered, and the heli beings to turn, the servo will not attempt to return the heli to the same position. I'd just get used to using rudder on the ground..Rhett..... I can't fly, but the Profi sure can.
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06-19-2009 05:26 AM  11 years ago
iflybyu77

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Fort Wayne, IN

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I'm prepared for flaming.. Hold your tail fin till it spools up just enough for T/R authority. Can't say I've ever done that.
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06-19-2009 05:30 AM  11 years ago
jascamera

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san francisco, ca

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I hear you guys. But I am really looking for a long term solution, not having to living with the problem

There's couple of time that it almost flip over because heli spin around on uneven ground.
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06-19-2009 05:34 AM  11 years ago
iflybyu77

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Fort Wayne, IN

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Ok, I'm gonna have to ask what you are doing to have it spin out of control and almost crash? I've had numerous underslung mounts and have never had this issue. Can you show us your mount so we can help critique and solve this problem?
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06-19-2009 08:00 AM  11 years ago
Highviz

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Newbury, Berks, UK

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On my original 360 mount I used a spring loaded lever that located in a series of notches below the driven pulley. A mini servo was enough to unlatch it after takeoff. There are pictures in my galley. - I just checked the date of the original photo's and I can't believe how long ago that was - almost 9 years ago Malcolm
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06-19-2009 10:39 AM  11 years ago
fionn

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Ireland

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One solution is to use an extended tail fin that sticks into the ground on takeoff and landing, I've used this on my maxi joker with crappy home made pano mount and it works fine.
Another method is to mount a servo on the body of the heli such that the servo arm can move into a slot in the camera mount, thus locking it into position.

Another option is to buy a joker with a direct drive tail and spin the tail up before the mains
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06-19-2009 12:52 PM  11 years ago
Mr Boombastic

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NSW Downunder

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I vaguely remember a mount that used a pin to lock the unit until takeoff was completed. You then retracted the pin so it could rotate.Blade Thrashing Lessons: Enrol Here
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06-19-2009 01:01 PM  11 years ago
theslayer

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Munich-Germany

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Look at photoship ones update for the vr360... that stops it turning on takeoff!

Daniel
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06-19-2009 01:55 PM  11 years ago
rerazor

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Mich.

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The pan lock on the VR360 is very impressive.

On some of the "other" mounts I have had I made a simple spring loaded L type bracket that you would set before spool up and it would prevent the heli from spinning. After spool up just move the tail a little and it releases.

You really don't want to put that much wear on your servo. Yes, the high torque servos will hold but over time........
Robert
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06-19-2009 02:35 PM  11 years ago
flyboy

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North America

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slow start up when spooling up the head and use the tail rotor to keep heli from spinning. I get 30 degrees of change in yaw max and usually just take off from there or negate with tail rotor. if it is any more exciting than that try starting slower? Pretty much a non issue for me.
FB
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06-19-2009 03:15 PM  11 years ago
GyroFreak

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Orlando Florida ...28N 81W

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Maybe use a locking pin that easily pulls out downward, fasten it to the ground with a short cord so on liftoff it pulls the pin. Use cord or light bead chain so it won't wash up into the chopper. No additional servo needed.I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?
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06-19-2009 08:17 PM  11 years ago
Rappy 60

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Paris, France

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Sell your undermount and get a front mount, that will fix the problem
slow start up when spooling up the head and use the tail rotor to keep heli from spinning. I get 30 degrees of change in yaw max and usually just take off from there or negate with tail rotor. if it is any more exciting than that try starting slower? Pretty much a non issue for me.
FB
seriously though,
+1 for this, slow start up and negate with tail rotor, also a non issue for me.

Dale
Load "*",8,1
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06-20-2009 12:23 AM  11 years ago
fionn

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Ireland

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It all depends on the resistance that your servo offers and the gear ratio that you're running. For instance the gear setups that I'm using are fine on 600 blade helis but the maxi joker would spin around several times before there is enough tail authority to counteract the effect. So it's not a moot point for some people.
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06-21-2009 07:17 PM  11 years ago
aramsdell

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Sanford, Maine

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Get yourself a new ESC if you cannot spoolup slow! What battery and running amps for your motor? I fly a Swift 16 for sport and another Swift 16 for AP. The Sport ship spools up to fast for AP about 2-3 seconds(and they call that soft start for helis!) Well that one has a Scorpion 4025-1100 motor and is extrememly powerful. The tail will kick on spoolup almost every time unless I'm on grass and still baby the throttle until it start up. The HELICAM however is a different story. Much tamer spoolup. That has a Century Electron 6S 80/100 amp esc and spoolup for that in heli mode can be 6-10 seconds NO KICK, NO SPIN. I would suggest investigating the ESC not a gyro etc.Should've bought a sim. Got a bucket of used blades!
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06-21-2009 07:34 PM  11 years ago
Louisiana Helicam

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West Monroe, LA

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You're spooling up too fast.www.louisianahelicam.com
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06-21-2009 08:13 PM  11 years ago
DKTek

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Melbourne, FL-USA

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What about a modified rotor brake from the XLV?

The idea is simple enough to fashion yourself.
The beatings will continue until morale improves...
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06-22-2009 04:19 AM  11 years ago
Rappy 60

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Paris, France

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You're spooling up too fast.
Exactly my thoughts also. I'm swinging 720's and have zero issues with it rotating on me.

Dale
Load "*",8,1
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06-22-2009 01:04 PM  11 years ago
fionn

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Ireland

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It's not true to say it's purely due to spooling up too fast, spool up speed is only one factor at play, the other main factor is the resistance that your servo provides coupled with the gear ratio. You cant make a judgement on someone elses setup without all the info.
I'm using a power jazz which has to the best of my knowledge the slowest spool up on the market & it will spin my maxi joker on my mount (no matter how slowly I advance the throttle) using the servo / gear ratio combination which I have in use.
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