Thread Tools
Old 05-14-2015, 03:16 PM
wfield0455 is offline
Find More Posts by wfield0455
Registered User
wfield0455's Avatar
United States, MA, Holliston
Joined Oct 2007
2,418 Posts
Originally Posted by philagan View Post
In reading your thread's your knowledge of tec problems my help me find an answer
to my 42 % sukoi crash. After 35 flights on it I traded modified wings (larger ailerons)
with 7980 servos for new wings and 7954 servos ,Brand new in the box.
Using my spectrum DX18 Xmtr I programed the new wing servos as before,on the
very first take off after about 100 feet I lost all control,Plane flew about half mile before crash. At crash 3 sat ant were on solid # 4 was disconnected all 4 servos in the tail would not move. Later at home performed bench test ,servos would not move until
I exchanged A with B then they worked ??? Sent the 12 x powersafe rec to Horizon ,They could not duplicate the problem and sent me a new rec.
The only thing I noticed was a strange sound out of the wings when the servo moved.
I installed the servo in a 42% aero works yak and they made the same noise, I removed the 7954s ,and will not use them until I figure this out. I have moved on to Brushless servos in the Yak.
I think the servos set up an oscillation feed back that took out the 2.4 receiver.
I talked to a Electronics Engineer in RF tec about it ,said it could happen.
Note ;I have used Hitec 5955 7955 7950 ,7980 , and now 9380s Dx18 xmtr 12 ch
pwrsafe rec , 6.6 v and 8.4 v for years with 100% confidence ,but not any more.

If you read the 12 channel PowerSafe instructions you will see that they say that at least 3 remotes are required, one of which must be connected to port A. There was most likely nothing wrong with the PowerSafe, it simply refused to connect because there was no remote connected to port A when you bench tested it, which is a requirement for it to connect. Before you get worried, once it connects to your DX18, if the remote connected to port A fails or get unplugged, everything will continue to work just fine until the next power cycle, where it will refuse to connect. Since Horizon was nice enough to replace the PowerSafe, I only mention this so that you don't run into this issue again in the future.

Did you perform a range test before flying? Since control was lost once it got 100' away I assume this should have showed up during a range test. When you returned the PowerSafe to Horizon, did you send your DX18 back to get it checked out as well? Before flying another airplane with it I would thoroughly range test it as the DX18 could well be the problem due to reduced RF output. Don't assume the only place the problem could be was inside the airplane..

wfield0455 is offline Find More Posts by wfield0455
Last edited by wfield0455; 05-14-2015 at 03:47 PM.
Reply With Quote
Old 05-14-2015, 09:01 PM
philagan is offline
Find More Posts by philagan
Registered User
philagan's Avatar
henderson nv
Joined Sep 2007
260 Posts
Hey Wayne Thanks for the reply More info, Port A sat broke connection in crash ,the other sats should have continued to operate . I have continued to use the DX 18 without any problems.,on low
value planes.I sent 12 pages of data log info to Horizon.In all of the test ,Log showed only 2 "F" and no "H' I think It went solid H and fail safe never activated. Remember I had over 35 flight s before I changed wings. I have installed telemetry now in my Yak , But have not flown it yet,
waiting for the wind to stop blowing
philagan is offline Find More Posts by philagan
Reply With Quote
Old 05-14-2015, 11:25 PM
bobzilla is offline
Find More Posts by bobzilla
bobzilla's Avatar
United States, NV, Boulder City
Joined Apr 2006
2,470 Posts
For those who have lost trust and no longer wish to have any Hitech servos (59xx, 79xx) in their planes, I will gladly purchase any from you for $10 each. Hitech has been constant winner in all my planes for 12 years without one hitch or failure.
bobzilla is offline Find More Posts by bobzilla
Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Hitec Customer Service, Awesome! 1bwana1 Radios 4 03-27-2008 12:05 PM
Hitec, Great Service dontmesswithgus General Discussion 13 12-13-2007 04:03 AM
Hitec 5945 Metal Geared Servos top case wear. airshowpaul General Discussion 17 05-01-2007 04:14 PM
Hitec 5955's and JR matchbox... TonyThomasian Radios 19 12-09-2006 01:25 PM
hitec 5945 centering issue spaceW Radios 12 09-12-2006 06:06 AM