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Sep 01, 2012, 05:18 PM
Lee Liddle
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Mini-HowTo

Reversing HK Etracts


I`ve wondered for a while if you could reverse some of the etract units on the market. I`ve reversed the truion block in some air/air retracts for a custom fit for some situations, and it was no problem. This may seem obvious to some guys, and i always thought it would work, but had never sat down and done it.

So I decided to cut up a medium sized HK etract to see if it would work. Yep, it does. It`s pretty simple. You just have to remove the pivot axle, cut away some plastic and turn the truion block around. Works like a champ.

Most applications, the stock set up works fine. But if you run into a space issue, or a problem with the strut interfering with the etract motor housing, give it a try.

It will be nessesary to add some extra mounting tabs for the mounting plate. Or you could just glue the mounting plate in place and reinforce it some. They are less than $100 a piece so they are disposable.

It seems to me that with just a little effort, this feature could be added to most of the etracts on the market. Why not factory guys?
Last edited by Knife Liddle; Sep 01, 2012 at 05:36 PM.
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Sep 15, 2012, 05:30 PM
My project: FAIREY DELTA 1
Erik v. Schaik's Avatar
Good modification!
I was hinking the same thing when redesigning the Rich uravich Miniwave wing to retracts I wasn't able to use very short struts. You show mounting a nose e-retract to a firewall is a no brainer now AND place the motor facing the tips give more structural reinforcing options in the wing as well.

great!
Sep 15, 2012, 06:54 PM
Lee Liddle
Knife Liddle's Avatar
I never thought about mounting the motor housing vertically. You are right, that becomes a great option now. Even mains on many jets that are in the fuselage could be done with firewall type mounting. Should be much more simple to do than rails. Also tilted gear like anF-16 might be easier.
Sep 16, 2012, 03:08 AM
My project: FAIREY DELTA 1
Erik v. Schaik's Avatar
And best of all, short scale like struts. jets look better with them, scale or not.

I have a similar set from Jepe (alu trunion). I aded a servo lever at the side of the trunion and a switch to cancel out the steering servo for the nose retract. I would have liked to see this incorperated in a nose-e-retract because this is very hard to program on my Tx.

Too bad you had to cut away the 2 brass nuts. could it be possible to keep them by adding an U-slot only? That would be best for mounting.
Sep 16, 2012, 09:56 AM
Lee Liddle
Knife Liddle's Avatar
On this etract the mounting points on that end are closer together and the brass nuts had to be removed (oh that sounds painful LOL) for the truion to rotate. I thought I would just add some material to the side of the unit and make new mounting holes. The other mounting plate ( the solid one for base mounting) still works fine and it could be modified into a "u" shaped plate for rail mounting apps.
Nov 25, 2012, 11:09 PM
ɹǝʎןℲ ǝıssn∀
taz101's Avatar
I know it's a bit late but you could use these ones:-http://www.hobbyking.com/hobbyking/s...stem_1pc_.html which have a mounting plate on the back!!

LURCH
Nov 25, 2012, 11:50 PM
Lee Liddle
Knife Liddle's Avatar
Quote:
Originally Posted by taz101
I know it's a bit late but you could use these ones:-http://www.hobbyking.com/hobbyking/s...stem_1pc_.html which have a mounting plate on the back!!

LURCH
Yes those will work.

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