It is currently Sat Dec 14, 2019 1:29 am

All times are UTC - 6 hours




Post new topic Reply to topic  [ 35 posts ]  Go to page 1, 2, 3, 4  Next
Author Message
 Post subject: Goblin 770
PostPosted: Tue Dec 24, 2013 2:09 pm 
Offline
User avatar

Joined: Mon Aug 01, 2011 6:55 am
Posts: 647
Can you recommend servos for this?

_________________
Rick


Last edited by rickn816 on Tue Mar 11, 2014 6:16 pm, edited 1 time in total.

Top
 Profile  
 
 Post subject: Re: Goblin 770
PostPosted: Tue Dec 24, 2013 11:02 pm 
Offline

Joined: Wed Jan 25, 2012 9:55 pm
Posts: 187
Easy.
http://www.mksservosusa.com/home.php?cat=24

Seriously though.. Does the manual give any guidance on minimums? I think servos these days are borderline overkill and it wouldn't surprise me if anything that's nice would be fine. Particularly if you aren't flying hard smack. I will say though, torque > speed particularly in this case.


Top
 Profile  
 
 Post subject: Re: Goblin 770
PostPosted: Wed Dec 25, 2013 8:11 am 
Offline

Joined: Mon Aug 19, 2013 2:18 pm
Posts: 487
This is purely my preference, but I would like to have a minimum of 200 oz/in of torque on a 770 and the more the better.

With the 3D performance capability of that machine, I would want a speed of .09 or better.

Metal gears are a must.


Top
 Profile  
 
 Post subject: Re: Goblin 770
PostPosted: Fri Dec 27, 2013 6:52 am 
Offline
User avatar

Joined: Mon Aug 01, 2011 6:55 am
Posts: 647
Thanks.

I appreciate the advice.

_________________
Rick


Last edited by rickn816 on Tue Mar 11, 2014 6:17 pm, edited 1 time in total.

Top
 Profile  
 
 Post subject: Re: Goblin 770
PostPosted: Sun Dec 29, 2013 10:28 am 
Offline

Joined: Wed Aug 28, 2013 8:43 am
Posts: 207
Check out the RJX servos. They have some that are around $90 each and have fantastic specs. I've been wanting to buy a set, but my old Futaba Brushless are still like new.


Sent from my iPad using Tapatalk

_________________
Nick Crego


Top
 Profile  
 
 Post subject: Re: Goblin 770
PostPosted: Thu Jan 23, 2014 3:16 pm 
Offline
User avatar

Joined: Mon Aug 01, 2011 6:55 am
Posts: 647
Haven't opened the box yet - based on what I've heard about wobble at lower head speeds.

Saving it for a warmer, rainy day.

_________________
Rick


Last edited by rickn816 on Tue Mar 11, 2014 6:17 pm, edited 1 time in total.

Top
 Profile  
 
 Post subject: Re: Goblin 770
PostPosted: Thu Jan 23, 2014 3:43 pm 
Offline

Joined: Wed Aug 28, 2013 8:43 am
Posts: 207
One of the guys on the RC Heli Nation podcast has one and has been fighting the wobble. It sounds like the issue is resolved by changing the blades based on what I heard him say. Just as an aside, I really don't like the SAB blades on my first Goblin, so I sold them before even opening the set that came with my 700 Competition. I run Edge 710 f3c on it, and even down at 1600 there is no wobble. Don't know about lower, I've never tried it. I'd imagine it would be the same on your 770, since it has the same head as my Comp.

_________________
Nick Crego


Top
 Profile  
 
 Post subject: Re: Goblin 770
PostPosted: Fri Jan 24, 2014 5:30 am 
Offline

Joined: Mon Jul 25, 2011 5:07 pm
Posts: 778
Location: West sussex, UK
The guy on RCHN said that the blade change just opened up the gaps where it didn't wobble, if I interpreted him correctly it gave him some areas that it didn't resonate but still shook at other head speeds.

but I think it happened to coincide with the head speeds he wanted to run in so he was happy.

/Steve


Top
 Profile  
 
 Post subject: Re: Goblin 770
PostPosted: Fri Jan 24, 2014 8:31 am 
Offline
User avatar

Joined: Wed Jul 27, 2011 8:13 am
Posts: 1523
Location: Caldwell, TX
That is the sole reason I haven't purchased one yet, well...and $$$. :rolling

I'm not certain why this is so difficult for them to figure out. :thinking

_________________
Bobby Barr
DT Helis
Graupner USA


Top
 Profile  
 
 Post subject: Re: Goblin 770
PostPosted: Fri Jan 24, 2014 8:50 am 
Offline

Joined: Wed Aug 28, 2013 8:43 am
Posts: 207
The wobblin goblin is why I got rid of my original 2 that I bought from the first batch released. I hated that it would shake at low speeds, and especially coming down autos. I thought that the HPS head would solve it, but from what's written above it doesn't seem to. I"ll have to try some lower speeds on mine, I've never gone below 1600, but it is solid at that speed.

The one thing I have noticed is that when it is REALLY cold outside (I"m talking single digits and below), I will get a bit of wobble at every speed after its been sitting out for a while. I chock it up to the O rings freezing and going solid in the head.

_________________
Nick Crego


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 35 posts ]  Go to page 1, 2, 3, 4  Next

All times are UTC - 6 hours


Who is online

Users browsing this forum: No registered users and 6 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group