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Old 05-14-2015, 06:14 PM   #1
philbel
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Default 96" DHC-4 Caribou - cannot find retracts

Hi all,

I just received this magnificent all-fiberglass Caribou.
Flying weight: about 20 lb. I will run 2 x Rimfire .60; should have plenty of power.
My problem is finding electric retracts with twin wheel. I have been doing extensive research but, apart from $400- $500 retracts from Robart, nothing.
Thanks for helping.


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Old 05-14-2015, 06:25 PM   #2
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Easy... prop saver (wheel collar with 2 opposed set screw holes) on the end of a straight wire strut. Replace the screws with longer ones. Drill the wheels out and insert brass tube when the screw threads make the holes too big and the wheels wobble.

There are other solutions for the fancy aluminum struts... but it adds up the same. Just gotta be a little creative.
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Old 05-14-2015, 06:38 PM   #3
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Thanks Fhhuber,

I would have liked to get these "fancy aluminum struts" because they are so pretty... I cannot imagine this Caribou with other equipment... Hobbyking has retracts for large models (10-12 kg) but the pin size is 8mm for the nose and 10mm for th 2 others. The problem is I can't find any oleo struts with these pin sizes. It is ridiculous to sell products with no accessories.
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Old 05-14-2015, 08:37 PM   #4
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Can make em... its not hard. Aluminum tube, set screws(4-40 US or #3 metric), spring and 2 plugs. Then a stub of music wire to connect to the retract mechanism and another for the axle. Some work with a drill press and a tap.

Just look at the pics of a few semi-scale oleos...
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Old 05-14-2015, 08:49 PM   #5
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My Grandma always said nothing is impossible. I'm not very good at that but I'll try.
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Old 05-31-2015, 06:01 PM   #6
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A 96" Caribou is likely designed to fly on twin 46's, therefore not considered large. I bought one of the large 10-12kg retracts out of curiosity to see how large they where.
IMHO, they are way too big for this plane, something in the 6kg sizing would be more suited, especially if you want to get it into the nacelles. Retracts in this range usually have 5 or 6mm pins, and struts are available in various lengths. The major issue here is reinforcing the retract structure to absorb the landing loads. fwiw flying barely
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Old 05-31-2015, 06:33 PM   #7
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Thanks flying barely,
This Caribou weighs 7kg without any equipment. I calculate it wil be around 11-12kg ready to fly. It will run on twin Rimfire 60 on 6S. I have determined that 2 x 46 will not be enough for a 20lb plane.
So the 6kg retracts you suggest will not be adequate. I will order the Hobbyking 10-12kg retracts and try to find - or adapt - oleo legs with 10mm pin for the nose and 8mm pin under the nacelles. But they definitely fit on the Caribou, according to manufacturer measurements.
6mm pin retracts would be desastrous for the Caribou from my point of view.
I still am trying to find twin wheel oleo legs for the tricycle retracts.
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Old 06-08-2015, 05:13 PM   #8
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Sounds like you got it all figured out, good luck to you flying barely
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