Fun, Learning, Friendship and Mutual Respect
START  HERE


Unregistered
Go Back   HeliFreak > R/C Electronics Support > Skookum Robotics


Skookum Robotics Skookum Robotics SK-360 SK-540 & SK-720 Digital Flybar


Reply
 
Thread Tools Display Modes
Old 05-11-2012, 09:12 PM   #1
reimorei
Registered Users
 

Join Date: Oct 2011
Location: Brazil, MG, Belo Horizonte
Default Will the 720 SL work on a 600 nitro?

Hi! Anyone running a SK-720 on a T-Rex 600 Nitro? What level of vibes can I expect? Will the Self Level work fine on a nitro?
reimorei is offline        Reply With Quote
Old 05-12-2012, 01:11 AM   #2
Groucho_
Registered Users
 
Posts: 1,916
 

Join Date: Feb 2011
Location: Europe
Default

That's a bit like asking how long a piece of string is, isn't it?

It definitely has the potential to work and It will definitely work as an FBL controller without self leveling. The amount of vibrations would determine whether that would work or not...
__________________
Henseleit TDR
Trex 550E
Trex 450 Pro
Blade mSR
Groucho_ is offline        Reply With Quote
Old 05-12-2012, 01:16 AM   #3
thefrog
Registered Users
 
Posts: 2,152
 

Join Date: Feb 2011
Location: Australia
Default

SL does work on a nitro - it works fine on my nitro. You have to play around with the mounting tape options until you find something that's absorbs enough vibes but it still firm enough. The condition of you nitro motor (e.g. bearings) has a big impact on vibes, as does the motor's state of tune.
__________________
Diabolo 742 - Faifa 90E - Srimok 90N - Logo 600SX - Goblin 500
thefrog is offline        Reply With Quote
Old 05-12-2012, 04:55 AM   #4
Doc-b
Registered Users
 

Join Date: Nov 2010
Location: South Loosiana
Default

What TheFrog said is the absolute Truth. I have A trex 600N. It works just fine. It took awhile. Playing with different mounting tapes, replacing engine bearing, Main shaft bearings. . But I finally got it. It was worth the trouble. This Forum will help you until You get it Right. You came to the right place.
Doc-b is offline        Reply With Quote
Old 05-12-2012, 06:54 AM   #5
jperkosk
Registered Users
 
Posts: 3,785
 
My HF Map location
Join Date: Dec 2009
Location: San Luis Potosí, México
Default

IMHO you've got to be a nutcase to try, although it's possible if you dedicate enough time and effort to it.

I got close on my brand new TR700N but I could never get SK720 to last more than 2-3 min without deactivating SL function (infamous flashing red light). Tried 4-5 different mountings, and got the vibes down to ~10 peaks (always on vertical axis @ engine frequency). The heli was checked out a few times @ my club by our local heli guru and declared perfectly sane.

Stopped short of declaring my Align kit (that otherwise flew perfectly, the FBL part of SK720 doesn't seem to give rat's a$$ about any vibrations) a total POS and throwing all kinds of upgrades on it. Living @ 1900 m altitude means I run rather rich with the carb adjustment that would make it very lean on the sea level, so can't really go lean in fear of strangulating the lubrication; this may be part of the reason.

Felt SK720 underutilized on TR700N so moved it to the new home on 6HV where it's happy, and I'm in the process of installing MB on the nitro.
__________________
Jerry
Trex 700N Pro fbl, 600N Pro x 2, 450SE v1, 250 v2 fbl, Compass 6HV fbl, Blade 450x, 400, 300x, 130x, mCPx, 120SR, mQx, mSR, Rotor Concepts HPQ1, Walkera CB180Q, CB100, Novus FP, CP, Esky Hunter, Big Lama.
jperkosk is offline        Reply With Quote
Old 05-12-2012, 11:03 AM   #6
thefrog
Registered Users
 
Posts: 2,152
 

Join Date: Feb 2011
Location: Australia
Default

Quote:
Originally Posted by jperkosk View Post
Living @ 1900 m altitude means I run rather rich with the carb adjustment that would make it very lean on the sea level, so can't really go lean in fear of strangulating the lubrication; this may be part of the reason.
I live at 1750m ASL and tune the motor to run between 90*C and 100*C. This is an OS 91 HZ-R regulated, the needles are very lean - about 1 1/3 turns on main and 1/3 on the mid. Lubrication isn't a problem but running the motor those 4 or 5 clicks rich would be a serious source of vibes. Check this comparison I posted a while back:

http://www.helifreak.com/showthread.php?t=396577
__________________
Diabolo 742 - Faifa 90E - Srimok 90N - Logo 600SX - Goblin 500
thefrog is offline        Reply With Quote
Old 05-13-2012, 08:43 PM   #7
desertstalker
Registered Users
 

Join Date: Apr 2011
Location: Australia
Default

Quote:
Originally Posted by jperkosk View Post
I run rather rich
Which is the problem, you need to tune the engine correctly, there is plenty of oil in the fuel if your not overheating the engine.
__________________
-DX8
-MSH MiniProtos Stretched, SK720, DS95/DS95i, Hyp 4S 25C 2500mAh
-MSH Protos Stretched, Brain, Hyp DS16/BLS251, 6S 3000mAh
-Goblin 500, HC3SX, Hyp DH16/MKS980BL, Scorp 4015-1100
desertstalker is offline        Reply With Quote
Old 05-14-2012, 07:52 AM   #8
reimorei
Registered Users
Thread Starter Thread Starter
 

Join Date: Oct 2011
Location: Brazil, MG, Belo Horizonte
Default

Ok folks, I´rather use my HC3-SX on the nitro as it doesn´t care about vibrations, and the SK-720 on my 550 Electric.
reimorei is offline        Reply With Quote
Old 05-14-2012, 08:18 AM   #9
fastflyer20
Registered Users
 
Posts: 2,850
 

Join Date: Nov 2008
Location: Buffalo Area
Default

Good choice, even with medium vibes, if you fly hard enough with a nitro, you can get it to disable SL, HC SL works great on any heli.
fastflyer20 is offline        Reply With Quote
Old 05-14-2012, 10:33 AM   #10
Humming_Bird
Registered Users
 
Posts: 62
 

Join Date: Feb 2012
Location: the ether
Default

Quote:
Originally Posted by fastflyer20 View Post
HC SL works great on any heli.
I keep reading statements like this, but I have always wondered under what circumstances the HC self-leveling works well? Nobody ever qualifies their claims. They all sound subjective to me.

The rumors I have heard are that the Heli Command system works great so long as you stick to scale-like flying, but it doesn't do so well after prolonged periods of aerobatics, high-G turns or 3D.

Does anyone have any actual experience with this?
Humming_Bird is offline        Reply With Quote
Old 05-14-2012, 01:20 PM   #11
fastflyer20
Registered Users
 
Posts: 2,850
 

Join Date: Nov 2008
Location: Buffalo Area
Default

I fly mild 3d, for Captain Rescue, it must boot up with the heli stable. Once activated, sometimes it will drift slightly left, right fore, aft but way better than I can correct under the conditions.
fastflyer20 is offline        Reply With Quote
Old 05-14-2012, 01:42 PM   #12
jperkosk
Registered Users
 
Posts: 3,785
 
My HF Map location
Join Date: Dec 2009
Location: San Luis Potosí, México
Default

Quote:
Originally Posted by thefrog View Post
I live at 1750m ASL and tune the motor to run between 90*C and 100*C. This is an OS 91 HZ-R regulated, the needles are very lean - about 1 1/3 turns on main and 1/3 on the mid. Lubrication isn't a problem but running the motor those 4 or 5 clicks rich would be a serious source of vibes. Check this comparison I posted a while back:

http://www.helifreak.com/showthread.php?t=396577
Froggy, amazing difference !!! I knew there was one, but never suspected it was that much.

Quote:
Originally Posted by desertstalker View Post
Which is the problem, you need to tune the engine correctly, there is plenty of oil in the fuel if your not overheating the engine.
Easier said than done, my friend. In addition to 1900 m ASL I have frequently ambient temperature ~30°C. My temp alarm on DX8 goes off @ 110°C and I feel I'll fry the engine if I lean it any more. During the trials I was doing when the flashing red light would stay off for a couple of minutes the engine was reaching >125°C, so I had to make it a bit richer. BTW, using Coolpower 20%, seems (non-quantified non-scientific subjective feeling) to run cooler that Byron 15% I was using before, although Byron smelled better and smoked more.
__________________
Jerry
Trex 700N Pro fbl, 600N Pro x 2, 450SE v1, 250 v2 fbl, Compass 6HV fbl, Blade 450x, 400, 300x, 130x, mCPx, 120SR, mQx, mSR, Rotor Concepts HPQ1, Walkera CB180Q, CB100, Novus FP, CP, Esky Hunter, Big Lama.
jperkosk is offline        Reply With Quote
Old 05-14-2012, 04:20 PM   #13
thefrog
Registered Users
 
Posts: 2,152
 

Join Date: Feb 2011
Location: Australia
Default

Quote:
Originally Posted by jperkosk View Post
Easier said than done, my friend. In addition to 1900 m ASL I have frequently ambient temperature ~30°C. My temp alarm on DX8 goes off @ 110°C and I feel I'll fry the engine if I lean it any more. During the trials I was doing when the flashing red light would stay off for a couple of minutes the engine was reaching >125°C, so I had to make it a bit richer.
That could have been the problem too - at 125*C it could have been too lean, maybe even experiencing detonation, hence the vibes.

Out of interest, we live in similar conditions - mid summer its typically low to mid 30s.
__________________
Diabolo 742 - Faifa 90E - Srimok 90N - Logo 600SX - Goblin 500
thefrog is offline        Reply With Quote
Old 05-14-2012, 06:33 PM   #14
desertstalker
Registered Users
 

Join Date: Apr 2011
Location: Australia
Default

Not an expert on nitros, but could it be worth trying 30%? AFAIK its easier to tune the higher nitro fuels?
__________________
-DX8
-MSH MiniProtos Stretched, SK720, DS95/DS95i, Hyp 4S 25C 2500mAh
-MSH Protos Stretched, Brain, Hyp DS16/BLS251, 6S 3000mAh
-Goblin 500, HC3SX, Hyp DH16/MKS980BL, Scorp 4015-1100
desertstalker is offline        Reply With Quote
Old 05-14-2012, 07:35 PM   #15
jperkosk
Registered Users
 
Posts: 3,785
 
My HF Map location
Join Date: Dec 2009
Location: San Luis Potosí, México
Default

Water under the bridge. I have already pulled the SK720 off the 700N and moved it to a happier home, 6HV. Remaining 2 SK720s are waiting for their small electric heli builds. 700N gets a MB + CP2 (for bailout). It actually flies quite happily with the current tuning and fuel, on SK720 vibes weren't that bad at all overall and the heli guru at my club declared my 700N fit and sane. Engine temp stays where it should be, rarely passing 100°C mark.

Would try a gallon of 30% just out of curiosity, but with SK720 gone won't even have means to compare
__________________
Jerry
Trex 700N Pro fbl, 600N Pro x 2, 450SE v1, 250 v2 fbl, Compass 6HV fbl, Blade 450x, 400, 300x, 130x, mCPx, 120SR, mQx, mSR, Rotor Concepts HPQ1, Walkera CB180Q, CB100, Novus FP, CP, Esky Hunter, Big Lama.
jperkosk is offline        Reply With Quote
Reply




Unregistered
Go Back   HeliFreak > R/C Electronics Support > Skookum Robotics


Skookum Robotics Skookum Robotics SK-360 SK-540 & SK-720 Digital Flybar

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


Copyright © 2004-2011 - William James - Helifreak.com