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HTG struts mod for 90mm EDF's

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HTG struts mod for 90mm EDF's

Old 08-03-2011, 06:30 PM
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Default HTG struts mod for 90mm EDF's

<span class="Apple-style-span" style="font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13px; ">My father was modifying a couple sets of HTG struts for the next project (F-100 + ???) and took a nice photo showing the various parts (some shortened and others not). Brakes are also clearly shown. You can see the 1" shorter leg in comparison to the original unmodified leg. The leg has to be drilled deeper to just below the smaller hole that mounts the leg to the retract via music wire to allow the shock spring to be deeper in the leg. The spring is shortened slightly as is the shock rod and leg bottom. The pivot point normally threaded on the bottom of the leg is drilled out to slide up the shorter leg (glued in place with CA). The alloy wheels and struts are available directly from Hobby Topgun and I've also seen them here
http://www.hobbywhere.com/index.php?...&product_id=66
These are ideal for 90mm FlyFly or Hobby Topgun sized EDF's especially if you want to fly off grass.
The picture is better than a thousand words...
Cheers Eric

PS Need some words... The single wheel "fork" is beefed up with a brass strip bolted to the alloy part. The extra brass fork is held on the axle nut with a short section of brass tubing that just fits over the nut (soldered on the strip of brass). This extra reinforcement was necessary on the heavier Mig 15 (3.7kg) when operating on grass or hard landings. The shock absorbing aluminum rod is beefed up at the bottom pivot section with some brass tubing (bent with side loading before fix).</span>
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Old 08-03-2011, 06:39 PM
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Default RE: HTG struts mod for 90mm EDF's

If you are wondering about the "brakes', the paddle is pulled using fishing line. I use my flap servo to pull the line when retracting the flaps after landing. A separate servo could also be used buy with the flaps no extra channel is needed . When flaps extended brakes off, flaps up pulls the paddle and plane stops much faster....
Old 08-04-2011, 12:47 PM
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Default RE: HTG struts mod for 90mm EDF's

Eric,

Interesting mods! and nice work!

Looks like you have 2.75" mains? Correct size for that Jet or are you going a tad larger?

Great idea on the nose wheel, the extra half. Appears more to scale.

You doing electric retracts?
Old 08-04-2011, 05:46 PM
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Default RE: HTG struts mod for 90mm EDF's

The mains are 68mm (2.67"). The nose is 55mm (2.17").
I have tried the FF electrics but had too many problems. Now I have air up/spring down type very similar to the FF air type (HK nockoff). Perhaps the newer HTG electrics are better but I think they still use a brass drive tube and mine kept stripping.
Cheers

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