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  Item found in the following categories;
> Servos & Parts > All Servos
> Hardware & Accessories > Wheels/Landing Gear/Retracts > Retracts

  RATED:

Digital Servoless Retractable system (1pc)

Digital Servoless Retractable system (1pc)

The easiest way to put retracts in your plane. No need to install a control box, messy wiring or a complicated air system. Just screw in the retracts, connect to your Rx and youre ready!
Reliable servo mechanism with metal gearing and a high torque motor ensures trouble free flying!
Why bother with air systems when you can now have a realistic and reliable electric unit at a fraction of the price?!
Landing gear not included with the servoless retractable system.

Features:
Robust landing gear strut and mounting bracket
Built-in 10 seconds over current and jamming protection
Integrated electric motor with a micro PCB
Double shock absorption design, completely protect the gears
Auto 90 degree twist when retracted 

Spec.
Working voltage: 4.5~5.5V
Speed: 0.7s/60deg 4.8v - 0.55/60deg 6v
Idle current: 3mA
Angle limit: 90 degree when retracted
Operating temp: -10~50C
Shaft size: 3mm
Mounting area size: 35mm x 33mm
Length: 67mm
Not suitable for a plane heavier than 2.5kg

PRODUCT ID: HKD-312

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Weight: 49g Quantity: 
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BK
Price$8.12


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 Customer rated
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Total of 63 discussions.
Jdde1  21 points - 2/5/2014
 
The description says there is an auto 90 degree twist. This video shows otherwise. Which is the case? I want to mount these on a quadcopter and these with the twist in the description are the only with a reversible mount. Do these twist while retracting or not?
 Andrey 4 points
Hi Jdde1. These system without twist while retracting? Just like on video.
mathew72  51 points - 11/28/2013
 
test retractable undercarriage HobbyKing
 Jdde1 21 points
The description says there is an auto 90 degree twist. This video shows otherwise. Which is the case? I want to mount these on a quadcopter and these with the twist in the description are the only with a reversible mount. Do these twist while retracting or not?
 mathew72 51 points
I'm sorry, I do not understand your question. probably because of the translation.
Marco Camargos  8 points - 11/26/2013
 
This is equal to PZ-15090?
Theodore  11 points - 9/20/2013
 
Hello...might be a dumb question but I'm new to retracts. How do you get the strut out of or into the retract unit? I have a bad one and can't figure out how to get the strut out of the thing. Have even taken it all apart and still don't see how to do it. I might get this retract, but I'd first like to know how I can put the strut in somehow. Any help appreciated! Thanks.
 Gary 3742 points
The brass pivot pin you can see in the picture has an internal thread, the screw you can see also in the picture screws into the brass and holds the strut in position.
BEST ANSWER CREDIT AWARDED
 Theodore 11 points
Thanks Gary. I actually was able to get an answer from an RC Groups forum. But I don't think that screw in the picture is what screws into the retract. The one I have (defective that I need to replace), needed a 1.5mm hey key in that brass hole, and the screw itself was tiny, almost microscopic lol* not the size of that "regular" screw in the pic. Anyway, you're the only one who responded, so happy to click the best answer thing for you. Thanks :)
 Gary 3742 points
Hi Theodore, on these units that screw is definitely the one that holds the strut in as I tried it but it could be replaced by a 3mm grub screw if preferred.
 Theodore 11 points
Ok, mine must be a different size then!
Grant  1 points - 9/9/2013
 
Hi Edward, is the hole for where the wheel goes into the retract the correct size for the standard landing gear that comes with the pz p47 Cheers
Customer Reviews
Overall Rating
Thomas
13 likes
Value
Quality
4 thumbs up!
would like to know if this is a good replacement for the Durafly T-28 Trojan retractable nosegear? The main gear retracts have aluminum blocks that the strut goes into...the nose gear is black plastic...I would like to know if that black piece is in there...mine snapped and the nosegear collapsed...it sits on the strut on a collar and an E clip to hold on!.....thanks for any help!


2 comments. Reply..

Overall Rating
jbc1234567
396 likes
ValueUNRATED
QualityUNRATED
1 thumbs up!
Just installed a set of these on my Starmax 70mm F-5. They look to be perfect for any 70mm EDF & 25 size or 'LIGHT' 40 size prop plane. Specs say upto 2.5kg but I would'nt go above 2kg, a little little less if you fly off grass. The action is smooth, not too quick & overcurrent protection :)
Suit a 3mm strut & uses brass threads where you can screw grub screws to secure the strut. Excellent value for money, I've ordered 3 more for my 70mm F-35.


26 comments. Reply..

Overall Rating
Bebbi
27 likes
ValueUNRATED
QualityUNRATED
1 thumbs up!
The problem is a not enough powerful H-bridge in the control device. My two retracts burned out after about 8 or 10 cycles. I opend them and there was a transistor damaged. After I've replaced it it's working fine again. For Me it's easy to repair it but what are doing other modellers?
I suggest that you have the same problem if you smell a bourned out electronic divice.


7 comments. Reply..

Overall Rating
iosxphone
28 likes
ValueUNRATED
QualityUNRATED
1 thumbs up!
there great but yo have to make a stopper so the 3 mm rod does not jam it up


1 comment. Reply..

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Overall Rating
Mark in Aus
824 likes
ValueUNRATED
QualityUNRATED
Like it?
smooth travel and nice speed. no problems yet as others have mentioned


2 comments. Reply..

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