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


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.

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 

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
Weight: 37g
Shaft size: 3mm
Mounting area size: 35mm x 33mm
Length: 67mm
Not suitable for a plane heavier than 2.5kg


Weight: 49g
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Price  $8.15

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 Customer rated
Total of 70 discussions.
jjmjmj  52 points - 11/8/2015
hey hk please put better photos for us to be able to see were the landing gear will be attached ral poor photo the bigger the details for the cliente about the product less rma do you have best regards
Felix-r  38 points - 11/2/2015
Hello, Anyone knows where can I find PCB replacement for this retract? I burned them for overvoltage, but the motor works ok. Or Please HK, sell them cheap for DIY fans.
Stephen  5 points - 6/30/2015
are these metal trunion?
 Napstr 1263 points
They have a brass pivot so the pin things are rotating around is metal (which is where you screw bolts or grub screws to hold your legs but they would be considered plastic trunnion as the rest is plastic - my opinion is these are better than metal trunion ones as the screws holding the legs are solidly held by the brass so you get a good hold and they are lighter - I have never seen the actual trunion give way on these as it sits flush with the mounting plate - the mounting plate however is what gets mangled on these and the metal trunion ones.
Sagar  2 points - 4/8/2015
Is there any way of reducing the max angle limit to say 45 degrees?
 Napstr 1263 points
Hi Nicholas - unfortunately there is no way to limit the travel - the units stop when jammed but won't apply a proper lock. To change the travel limit you would have to change the shape of the rotating block and its centre
Vincent  3 points - 9/8/2014
Can I controll these with an Arduino?
 NewToHobbyKing 16274 points
Vin anything that can control a SERVO can control this RETRACT. It acts just like a servo. So I am thinking YES!
Customer Reviews
Overall Rating
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 sits on the strut on a collar and an E clip to hold on!.....thanks for any help!

2 comments. Reply..

Overall Rating
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
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
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
Like it?
smooth travel and nice speed. no problems yet as others have mentioned

2 comments. Reply.. here to see all reviews
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