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Old Mar 01, 2015, 01:55 PM
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Idea
Retractable Main Gear for Floats

After having previously posted the Retractable Nose Gear for Floats, we carry on to try solving the main gear. The floats are GP40 Balsa Kit floats, with a Firgelli servo. Gear is Hobby King Oleo with drum brakes.

Photos show the formers and retract compartment laid up before gluing, waterproofing etc. More to do, but this is the beginning.
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Old Mar 01, 2015, 02:23 PM
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Main Gear Video

Operation of the main gear. Nothing is permanently glued-up yet.
MainGearVideo301 (0 min 19 sec)
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Old Mar 02, 2015, 01:48 PM
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Will you waterproof the wheel bay ?
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Old Mar 02, 2015, 03:23 PM
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Quote:
Originally Posted by eflightray View Post
Will you waterproof the wheel bay ?
Yes, and boy is that a challenge! I am starting by coating everything of wood with polyurethane and all joints will get a bead of 3M silicone. I have also had to box in the areas where the servo axle travels and where the strut penetrates the former in an effort to get most water to drain back out the bay.

Lots of pesky details.

My first attempt at this a couple years ago failed on the waterproofing score, allowing water to accumulate in some compartments of the float. I am keeping a wary eye on it this time.
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Old Mar 03, 2015, 06:35 PM
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Wheel Well

The wheel well is mostly in. It is made of some leftover RV rubber roof material. Photo a bit blurry again.
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Old Mar 04, 2015, 01:57 PM
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Gear and Wheel Well

The aft sheathing is cut and just taped up for now. I need to stay with framing only while cutting parts for the second float, and now proceeding to install the retractable nose gear into this first float.
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Old Mar 05, 2015, 05:13 PM
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Re-Post of Firgelli Mock-up For Main Gear

Had a request to post this mockup here so the actual Firgelli is visible.

FirgelliMainGear01 (0 min 28 sec)
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Old Mar 08, 2015, 04:40 PM
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Nose Gear Framing

Here is the first framing rough-in for the nose gear module.
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Old Mar 10, 2015, 04:25 PM
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Nose Gear Photos

Most of the framing done. The module inserts from the front.
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Old Mar 12, 2015, 06:41 PM
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Gear View With Sheathing Temp In Place

These shots show gear both extended and retracted.
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Old Mar 30, 2015, 11:50 AM
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First Float Showing Nose Gear Retracted

Here is a shot of the first float nearly ready for covering, with gear in the retracted position.
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Old Mar 31, 2015, 09:32 AM
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Beauty! Those are really coming together nicely, can't wait to see them in use for real.

Have you given any more thought to ground steering? In the other thread we mentioned the Turnigy wheels that could be rigged for differential braking. It seems that they're only offered in 70mm tire size though (2.75"), and I need something closer to 95mm/3.75" for my plane. I wonder if the tires are replaceable...?
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Old Mar 31, 2015, 10:20 AM
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Hi Again Crazy,
You must be looking at some ginormous floats! Mine are the GP40 balsa kit floats, about 34". Nose wheel is 1.5 inches and main gear with brakes are 1.75 inches.
The full-scale floats have noticeably small wheels, due to both water drag potential at the nose as well as at the mains. Due to the small compartment height size restrictions, many of the full-sized, as on mine, do not have the mains retract completely above the aft keel. Too large wheels can make this a problem to achieve enough retraction to keep the tire from dragging too deeply at the nose and from protruding below the fore keel when retracted.

How big are those floats you are doing?
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Old Mar 31, 2015, 10:29 AM
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Quote:
Originally Posted by Crazy_pilot View Post
Beauty! Those are really coming together nicely, can't wait to see them in use for real.

Have you given any more thought to ground steering? In the other thread we mentioned the Turnigy wheels that could be rigged for differential braking. It seems that they're only offered in 70mm tire size though (2.75"), and I need something closer to 95mm/3.75" for my plane. I wonder if the tires are replaceable...?
Here are the ones I used:

https://www.hobbyking.com/hobbyking/...dProduct=24332
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Old Mar 31, 2015, 10:40 AM
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So I then recalled from the other forum that your floats are 51". Sheesh, probably will consolidate the nosegear and main discussion threads somehow. Those are indeed 50% larger than mine.
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