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Synergy R/C Synergy N9 > Synergy Tail Failure ... Again!!!!!
 
 
Marshall Burrou
Senior Heliman
Location: Maumelle, Arkansas

One thing that seems to be working until the re-designed tail grips come out is....... Thread a lock nut upon a 12mm hex head screw. Thread it down throught the top of the lock nut. Meaning, the bottom of the lock nut faces inwards towards the thrust bearing. It takes the side load off the top of the screw where it is weakest. Robbie did this after 2 crashes due to breaking bolts and it hasn't happened since. The problem is the fact there is no radial bearing outside the thrust bearings. This seems to be a reasonable fix for now.
12-13-2007 09:03 AM
 
 
cdrking
Elite Veteran
Location: Seattle

Marshall Burrou,

I've haven't heard of that one before. Interesting, I wonder if that's in the Robbie manual?

Jeff

To hover is divine, the alternative is rather PLANE.
12-13-2007 04:49 PM
 
 
unruly_heli_nut
Senior Heliman
Location: SoCal

That's a great tip. Not that I need it. Have Kasama grips already
12-13-2007 05:38 PM
 
 
Fernando
Senior Heliman
Location: Madrid

Marshal,

I would not trust this one either: this is a 3mm less the thread which is even thiner than the MA part that used to have the failure with a 95mm blades disk.

Look: this tail has: i. a 105mm blades, ii. a much direct drive than the MA as the tail TT does not give any room for play iii. no radial bearing (no radical). and iv. a 3mm screw or hex screw (does not matter). All these four reasons are your bets for failure.

To me (and indeed in my case) my Synergy is parked until this new design comes out, or someone comes with a better solution, I do not want to hurt anyone...
12-13-2007 06:47 PM
 
 
Freya_man101
Senior Heliman
Location: newport news VA

kasama tail works perfect for me aswell

-----Ricardo Maldonado----- Vibe 90---Vibe 50---SYNERGY---Stratus BW edition
12-13-2007 11:58 PM
 
 
Marshall Burrou
Senior Heliman
Location: Maumelle, Arkansas

Quote 
I've haven't heard of that one before. Interesting, I wonder if that's in the Robbie manual?

Jeff

I was speaking of Robbie Haas a friend of mine that tried this fix and appeared to improve the situation greatly. I do agree it would be better with re-designed tail grips and bearings.

Also to note is, most Synergy's are not having this problem..
12-14-2007 12:05 AM
 
 
cdrking
Elite Veteran
Location: Seattle

I guess it wouldn't be in the manual then.

I haven't had a problem with mine but would still like to see a better system.

Jeff

To hover is divine, the alternative is rather PLANE.
12-14-2007 12:54 AM
 
 
rappyboy
Heliman
Location: Melbourne, Victoria-Australia

With regards to an easy perhaps quick fix to this problem, it seems that nothing has worked so far. I am a motor mechanic and approx two years ago we had a 2500kg Daewoe forklift that would not stop breaking engine mounting bolts, we tried the genuine Daewoe bolt and a number of very high tensile bolts all with no improvement. We noticed that the higher the tensile rating on the bolt was the quicker it failed. We obtained a plain old everyday (Name brand) mild steel bolt and have had no problem since. Just an idea!
12-14-2007 01:47 AM
 
 
rchaas
Senior Heliman
Location: Tulsa, OK

I haven't published my Robbie manual yet, but Marshall's description above (his idea during a brainstorming session we had) of the lock nut mod has worked perfectly for some time now.

I also put a Kasama tail on one of my machines and it seems to be working well, although weather has put a big damper on flying lately.

Robbie
12-14-2007 02:49 AM
 
 
cdrking
Elite Veteran
Location: Seattle

I have about 95 flights on one of my Synergy's and there has been no problem with the bolts. I did put a higher quality bolt in and I've switched to 95 mm tail blades. I have the gain set at 32% on a GY611.

My first Synergy had no problems either until I drilled it in the ground at terminal velocity. I had quite a few flights on this machine with no problems with the tail.

I am putting a Kasama tail on another Synergy and will let you know how it flys. I have read that some say the Kasama tail is not as efficient as the stock one. I have no first hand experience with it though.

Jeff

To hover is divine, the alternative is rather PLANE.
12-14-2007 02:55 AM
 
 
Marshall Burrou
Senior Heliman
Location: Maumelle, Arkansas

Quote 
I haven't published my Robbie manual yet

I'll be awaiting the manual... I'm sure it will be really good! That anatomy of a good tail!
12-14-2007 04:46 AM
 
 
cdrking
Elite Veteran
Location: Seattle

Quote 
That anatomy of a good tail!
of tail or a good tail?

Jeff

To hover is divine, the alternative is rather PLANE.
12-14-2007 04:47 AM
 
 
Carl Bonta
Heliman
Location: Elgin, IL USA

I waited to post information regarding this issue, because team Synergy has be testing a solution for this problem for months. Synergy has a new tail hub design that is being tested and very close to public release. The new hub is posted on the Synergy website ....

http://www.synergyrc.com/en/images/...il_hub_long.jpg

As you can see the hub is much longer which will accomodate dual radial bearings and possibly a new style bolt to strengthen it even more. That is pretty much all I am at liberty to say about the new design since the part has not been released as of yet.

Matt Botos sent me drawings of the new design and contacted me to have the prototype hub manufactured. After manufacturing the new hub I sent them to Todd and Matt for testing. One week later I went to Matt’s home flying field to witness the results for myself. Todd and Matt both beat the hell out of these parts, and what was ironic is they both felt that the tail was much more precise, in a way that was never felt on their N9's or any other heli for that matter.

Matt has also completely solved the main blade grip issues as well, both with choice of new high impact material and improved geometry, I witnessed the prototype testing and it is amazing how much stronger the grips are.

http://www.synergyrc.com/en/images/...e_grip%20v2.jpg

Point of this post is to assure you that every issue is and has always been addressed internally, however it may look like nothing is happening but we are doing whatever it takes to come to a definitive solution for each problem. With that said, parts must be redesigned, retooled, manufactured and tested and tested and tested. Then the changes are made in production.

The Synergy group is listening and working on making this helicopter handle the extreme maneuvers that today’s pilots are throwing at it.
12-14-2007 10:02 AM
 
 
unruly_heli_nut
Senior Heliman
Location: SoCal

OK, so where's my N9SE
12-14-2007 02:51 PM
 
 
Long Nguyen K.
Senior Heliman
Location: Ho Chi Minh City, Vietnam

tail grip upgrades?

As far as I can see there seems no upgrade for the tail grips so it means we are gonna use the old tail with the upgraded tail hub?

Long Nguyen
Heading back to my country! Gonna have my SHAVERS cut rice!
12-14-2007 03:27 PM
HOMEPAGE  
 
 
unruly_heli_nut
Senior Heliman
Location: SoCal

I think they said longer tail hub to accomodate two radial bearings per side. So they would have to upgrade the tail grips as well
12-14-2007 03:36 PM
 
 
Carl Bonta
Heliman
Location: Elgin, IL USA

Negative on the new tail grips, only a new hub, you will be able to install 2 radials in the current grip aswell as the trust bearing.
12-14-2007 04:51 PM
 
 
unruly_heli_nut
Senior Heliman
Location: SoCal

Cool, thanks.
12-14-2007 05:01 PM
 
 
SynergyRC
Heliman
Location: California

Long Nguyen K.

There are only a few of the upgrades posted on the Synergy site. What Carl meant was that the new hub does not require a special tail blade grip.
There will however be CNC tail blade grips in the SE Kit. I've posted some more pics for you here

Thanks,

Team Synergy
12-14-2007 07:14 PM
 
 
chem
Heliman
Location: Dijon - France

Quote 
There will however be CNC tail blade grips in the SE Kit.

FANTASTIC!!!

Well, after only 41 flights and 3 serious crashs because of mechanical failure ('cause of bad concept!!!!) I would just have to put my Synergy down on a shelf by waiting for these new upgrades and, of course, spend a lot of more money again to buy them.

No, I'm not a cash cow!

I think I'll fix this heli and sell it.
Unless Synergy Helicopter is able to suggest me an arrangement.

Chem
12-14-2007 07:36 PM
HOMEPAGE  
 
 
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Synergy R/C Synergy N9 > Synergy Tail Failure ... Again!!!!!
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