rrTV-PHOTO   New HD TV
HOME   rrTV-PHOTO   GALLERIES   MY GALLERY   HELP-FAQ
myHOME PM pmRR MEMBERS 349 ONLINE 42 EVENTS SEARCH REGISTER  START HERE
 
1 page381 viewsPOST REPLY
Real Raptors . Mikado Modellhubschrauber . GrandRC

.
.
Aerial Photography and Video > Logo 10 shakes in the heat
 
 
Vortex Aerial
Senior Heliman
Location: Huntington Beach Ca

Today we were out in 117 degree (F) heat to test the heli and shoot some panos.

I flew the L10 with the pano rig on it to see how id handle the heat.

Other than the Kontronik Jazz going into failsafe at 160 degrees and dropping to half throttle, the thing shakes pretty bad too.

Ive noticed that the hotter it is outside the more it does this.

At home by the ocean on hot days (like 80 degrees or so) itll have a vibration thats just enough to see if you real close to the machine .... as the flight progresses, it goes away.
Today, it was requireing a head speed increase to get it to go away (from 1700 to 1800), and it wasnt cureing it completely.

The machines got about 200 full payload flights on it and i havent touched anythng.

Any ideas?
07-02-2008 04:03 AM
HOMEPAGE  
 
 
Seablade
Veteran
Location: floating around

This is a long shot, but is the heli sitting in the sun or in the back of a car before the flight long enough to heat up more then you think it is?
Might there be anything expanding when hot and cooling off in flight as the air cools it down?

Just out of curiosity, what Rx are you using? There is a thread in the futaba FAAST forum about the 6014 RX having heat problems at 167 degrees F. That generated a whole slew of posts about temps and operating ranges specified by the maufacturer. Since you mentioned your ESC going to half power at 160 degrees, you might have another electronic temp problem.

"Vini, Vidi, Velcro"
07-02-2008 05:07 AM
 
 
tabbytabb
Elite Veteran
Location: seattle

Perhaps the plastic bearing blocks on the main shaft are expanding enough to allow a sloppy fit for the mainshaft bearings and this is allowing things to shimmy around a bit. Check for any excess slop/play in the heat.

I know when we got to mexico I had to re adjust the belts quite a bit due to heat/humidity.

Just a thought, also check blade tightness. My logo and Jokers like them pretty loosey goosey and they can get a bit tight in the heat.



Tabb
07-02-2008 05:41 AM
HOMEPAGE  
 
 
flyfast
New Heliman
Location: NY

I don't own a Logo 10, however, most plastic framed helis and generally most r/c helis designed for 3d have marginally rigid enough frames for our application in normal temps. I suspect in that kind of heat you may be well above the temp deltas design limit. Construction mat'rl strength decreases as outdoor temps rise and vise-versa. This is true for all mat'rl types, even wood, and is why we use known temp variables when calculating deflections.

Kevin
RK
07-06-2008 06:19 PM
 
 
AZ ChopperCam
Veteran
Location: Arizona

Quote 
I suspect in that kind of heat you may be well above the temp deltas design limit.

not likely at all. I've been flying several Logo's in temps as high as 120° out here in AZ during the summer. Flies no different than any other time of year except for slightly lethargic climouts.

I think his case is an anomaly and not something normally seen in Logos that fly in high temps.
07-06-2008 07:17 PM
HOMEPAGE  
 
 
Vortex Aerial
Senior Heliman
Location: Huntington Beach Ca

Well it turns out that it was just this logos turn in the barrel.
It shakes regardless of temp come to find out.
Everything was in perfect condition during the teardown so i will take a stab in the dark and say it was the spindle o-rings softening with use
Its going back together now and it will be running the larger L600 blade grips and associated hardware along with a stiffer o-ring set.

Noticed during the assy. that the 600 grips have a larger opening than the smaller L10 grips do.
My question is can the same 580 blade set be used with these larger grips and if so where would one aquire the shims?
07-06-2008 08:48 PM
HOMEPAGE  
 
 
flyfast
New Heliman
Location: NY

I've a lot of blade shims. Measure blade grip opening and blade thickness with calipers for me and PM me and I'll see if I have what you need. Or, simply just part some off on a lathe 4 U. Sorry bout getting your thread off-topic there.

Kevin
RK
07-08-2008 12:01 PM
 
 
theviper
Senior Heliman
Location: Chandler

Here is a stab in the dark. Have you ballanced the blades lately? What blades are you running? Carbon I assume? Have you checked them for warping or twist? Tried a new set of blades?

I too fly in AZ and the temps are VERY hot here. I have seen carbon blades warp from the house to the field in the back of my covered truck.

Harder dampeners may amplify the shaking too. Be ready for that possability.

Viper

Tech Tip of the month: Check all your bearings before you pack it up for winter. Oil = no rust!
07-08-2008 04:23 PM
HOMEPAGE  
 
 
Vortex Aerial
Senior Heliman
Location: Huntington Beach Ca

Quote 
Have you ballanced the blades lately?

This is looking like the most likely possibility. Turns out one of the blades is comming apart on the inside. This contributes to the shakeing but also the pano rig was a bit on the flimsy side creating a feedback to the chassis vibrations. The pano rig is now more ridged and the whole rig runs smooth at the three head speeds we run (1700-1750-1800). That is until i brought it back out to the desert today in the heat. Im still running the deffective baldes so chances are the machine will run fine once the new blades arrive. (which Sean at Mikado is repalceing free of charge.) They are Mikado 580 symmetricals.

Once the blades arrive the head will be converted to a logo 600 head.
Will run the same 580 blades with 12mm roots but need to shim 2mm to fit the 600 grips. Have shims but they are for 5mm drag bolts and the blades and grips are 4mm.
Should this be a concern?
07-09-2008 03:37 AM
HOMEPAGE  
 
 
AZ ChopperCam
Veteran
Location: Arizona

don't worry about the shims being 5mm center bore. they will do fine.

FYI, I ran a 620mm equipped stretched Logo 10 on the L10 head for a long time on a pano rig. AUW was about 10lb. That L10 head is plenty strong for heavy duty AP work.
07-09-2008 03:46 AM
HOMEPAGE  
 
 
Vortex Aerial
Senior Heliman
Location: Huntington Beach Ca

Shot a pano out in the desert first thing this morning in about 95 degrees. Heli runs smooth at 1700 and 1750, but it starts to do the shake at 1800 (dont use 1800 head speed for panos or photos so no big deal really)

Then i bring the whole thing home to the beach, take it out of the truck, and it runs fine at all three head speeds.

Got the new Blades mounted up today. Still running the L-10 head for the time being (jobs are lineing up, no time to fiddle).

After much tinkering got the blades properly balanced and the rig running smooth enough to do AP with, but seems to run the same as it did with the old blades that were deffective inside.

Going back out to the desert early next week to see if the new blades made the diff.

: To be continued :
07-10-2008 03:26 AM
HOMEPAGE  
 
 
rroback
Key Veteran
Location: Irvine (UCI), Ca

Perhaps the pilot needs more gatorade?

Rhett... There's no power like E Power!
07-10-2008 05:38 AM
 
 
Vortex Aerial
Senior Heliman
Location: Huntington Beach Ca

Went back out to the desert and am happy to say the L-10 doesnt shake any more.

Cant give any definitive info on what made it shake but heres a theory:

Usually when the Heli is outfitted with the pano rig on it, it lays down on its side during transport, a good deal of the helis wieght is pushing laterally on the blade grip and spindle.
My theory is that this forces the spindle off center, and then when combined with hi heat, the spindle o-rings "take a set" to this position, and then it shakes.......for a while, until the o-rings go back to there original shape.

Kept the heli up right this time around and no shake.
07-17-2008 06:36 PM
HOMEPAGE  
 
 
1 page381 viewsPOST REPLY
CanoMod . Futaba-RC . A Main Hobbies

.
.
Aerial Photography and Video > Logo 10 shakes in the heat
  UPDATE SCREEN   PRINT TOPIC Advertisers 

Subscribe to This Topic

Saturday, September 6 - 7:17 am - Copyright © 2000 - 2008 runryder.com | email | link to rr | runryder needs cookie