down and locked gear failure    Gallery
View related threads: (in this forum | in all forums)

Logged in as Guest



Users viewing this topic: none
    Search This Thread  
 
Printable Version


Ziroli SBD Dauntless - RTF
Seller:  misfit
Details:   $3,000.00   |  6/17/2013   |  Classified Ad
We will rotate YOUR AD in this spot if you select "Forum Featured" when placing or editing your ad!

All Forums >> Electric Aircraft Universe >> Electric General Discussion >> down and locked gear failure
Page: [1]

Tower Hobbies Get Coupon Codes Brands  
Login
Message << Older Topic   Newer Topic >>
down and locked gear failure - 7/26/2012 11:46 PM   
gizmos


 

Posts: 104
Score: 100
Joined: 12/30/2005
Last Login: 12/21/2012
From: burbank, CA, USA
Status: offline 		Has anyone else had gear failure with down and lock retract conversion? We have had 10 for 10 failure and I just read where two other guys with jets had the gear fail. Has anyone used the electric gear from dreamworks r/c? I would like to know what failed on your gear. This is the same gear that is sold by robart. Here is a picture of the gear that failed in a gear that weight is 3lbs each on a 80lb jet. I sent them back for repairs over 3 times each and still dont work. That little gear at the end of the number 11 blade is the gear that is pressed onto a little 50cent motor.Has anyone came up with a fix? Thanks for your help

Attachments
Click to see fullsize image.
Click for fullsize


Hide Signatures
       Post #: 1

RE: down and locked gear failure - 7/27/2012 9:40 AM   
cubaneight


 

Posts: 107
Score: 101
Joined: 5/1/2004
Last Login: 6/15/2013
From: Colchester, UNITED KINGDOM
Status: offline 		If you've returned the gear three times for repair and they still don't work (providing they are being used correctly and within manufacturers specs), then the engineering is probably inadequate and not of merchantable quality for their intended purpose. In the UK, the supplier would have a case to answer with the likelyhood of a full refund of the purchace price.
Why should you be forced to look for a fix at your own expense on an item that I'm guessing is not cheap, and deserves to work correctly and reliably in the first place?

Good luck.

C8

Hide Signatures

(in reply to gizmos)
       Post #: 2

RE: down and locked gear failure - 7/27/2012 8:27 PM   
Gohmer


 

Posts: 144
Score: 112
Joined: 11/5/2006
Last Login: 6/19/2013
From: Owatonna, MN, USA
Status: offline 		Learn how to land. All retracts are delicate.

Hide Signatures

(in reply to cubaneight)
       Post #: 3

RE: down and locked gear failure - 7/27/2012 9:22 PM  1 votes
vasek



Posts: 3644
Score: 147
Joined: 1/24/2002
Last Login: 6/18/2013
From: Prague, CZECH REPUBLIC
Status: online
quote:

ORIGINAL: Gohmer

Learn how to land. All retracts are delicate.


That's a little harsh, don't you think? There are 1 000 000 000 reasons a retract can fail and only one of them is a bad landing...

_____________________________

Remember: Speed is life!

Hide Signatures

(in reply to Gohmer)
       Post #: 4

RE: down and locked gear failure - 8/10/2012 8:49 AM   
chuckk2


 

Posts: 380
Score: 106
Joined: 7/24/2007
Last Login: 6/20/2013
From: Warner Robins, GA, USA
Status: offline 		It looks like a manufacturing defect to me! We used to see a similar problem years ago with pressed on gears and slot car motors.



Hide Signatures

(in reply to vasek)
       Post #: 5

RE: down and locked gear failure - 10/5/2012 11:12 PM   
Kahu1958


 

Posts: 23
Score: 100
Joined: 8/26/2007
Last Login: 2/25/2013
From: Blenheim, NEW ZEALAND
Status: offline 		A few months ago I contacted Down and Locked regarding converting Robart 150HD9 retracts to electric. They said they would do it for $500 (incuding shipping)or I could wait for the DIY Robart conversion kits due out soon. I see Robart is now offering the conversion kits at $229.95 (plus shipping no doubt).
For these prices I would expect the products to be very high quality and to last forever (barring crashes), not having quality issues and failing as being reported. I thought the control system would shut off the drive if it overloaded, so the actuator would not destroy itself.

I now have doubts as whether or not to convert to electric, it did seem attractive for more scale retract speed, easy to wire in, Changing batteries rather than pumping up air cylinders and worying about leaks, and it should be reliable.

Hide Signatures

(in reply to chuckk2)
       Post #: 6

RE: down and locked gear failure - 10/6/2012 8:44 PM   
cyclops2



Posts: 2896
Score: 111
Joined: 12/23/2005
Last Login: 3/1/2013
From: Frenchtown, NJ, USA
Status: offline 		My opinion.

If the L G linkage is a TRUE over traveling locking link type. A severe nose down angle ...SHOULD..... break / crack the moving linkage parts.

If they are using a very high speed motor with a large amount of gearing..................The gears will break if the linkage DOES NOT mechanically get to the fully locked down position. PERIOD !!

How the lockdown position is made, determines geartrain breakage..PERIOD.

If you remove the motor & gear train............LOCK the gear down in fully down. Plain old Electricans tape wrapped around the down linkage is fine.
Land the plane several times. You would have your answer about the motor ...NOT>>>fully locking the gear COMPLETLY in the down position.

I designed many servos for industry. There is always a compromise between mechanical & electrical limits.

Poor design.



Hide Signatures

(in reply to Kahu1958)
       Post #: 7

RE: down and locked gear failure - 10/6/2012 8:55 PM   
cyclops2



Posts: 2896
Score: 111
Joined: 12/23/2005
Last Login: 3/1/2013
From: Frenchtown, NJ, USA
Status: offline 		50 years ago I designed my own heavy duty large scale boat rudder servos with a simple motor, tube coupling, long 6-32 screw & a brass 6-32 nut. Then made brass connecting links to the rudder

Electric motors & high gear ratios can transmitt VERY high shock loads to the tiny gear tooth pressed onto the motor shaft.



Hide Signatures

(in reply to cyclops2)
       Post #: 8

Page:   [1]
All Forums >> Electric Aircraft Universe >> Electric General Discussion >> down and locked gear failure
Page: [1]





Jump to:


 
Google 



Search | Marketplace | Event Calendar | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

Photo Gallery | Instructor Search | Field|Track|Marina Search

Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

SITE MAP!   : :   FORUM RULES

RC Universe is a service of Internet Brands, Inc. Copyright © 2001-2013.

Charities we support that also need your help
Yorkie Rescue | Humane Society | ASPCA | Crohn's-Colitis America


0.281RCU1