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Twin Otter 125inch wingspan

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Twin Otter 125inch wingspan

Old 06-01-2013, 09:14 AM
  #251  
thailazer
 
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Default RE: Twin Otter 125inch wingspan


ORIGINAL: GoNavy

Is that a deicing boot on the leading edge of the lower gear fairing?
That's just a chip guard for stones kicked up by the nose wheel. Interesting side note...I've flown on some Twin Otters that had a chip guard on the side of the fuselage to keep ice being shed from the prop from denting the fuse skin. Guess it makes quite a racket when ice hits it.
Old 07-23-2013, 08:30 AM
  #252  
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Default RE: Twin Otter 125inch wingspan

The Twin Otter is longer than the 8 foot bed of a full size pickup. It will greatly simplify transport to leave the center wing section on the plane. So, we purchased a used pickup topper and had that installed, and then I built the sliding shelf show in the pictures. This allows the Twotter to sit on its gear, on the movable shelf. To load or unload, the shelf is extended so two people can pick it up, by the ends of the center wing section, by standing on either side of the lowered tailgate. When loaded, the plane slides back about 40 inches on the sliding shelf, leaving about 7 inches of the nose extending beyond the truck bed. (Protection for that nose section will be devised and added as necessary.)

No reaching or crawling into the pickup is necessary

Thus another 10 days of the summer has passed by and still no first flight.

I do so love wood. Pine, Balsam Fir, White Ash, and some old plywood cabinet doors.

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Old 09-03-2013, 04:44 PM
  #253  
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Today our Twin Otter took to the air. A lovely sight and sound. Finally.
Old 11-27-2013, 10:59 AM
  #254  
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These pictures were taken before the first flight at our field.

We decided to fly with cowls removed.

The Saito 125s are completely enclosed with the cowls on. To ensure adequate cooling, I louvered the cowls and made the two scale cooling ducts functional.

The crankcase vent runs inside the cooling duct. The end of nylon tubing is visible in the closeup. Things are quite "busy" in the engine compartment.

My original fueling setup had to be changed because the carbs allowed fuel to pass even in the fully closed position. Fueling now is done by detaching one end of the fuel tubing where it runs horizontally across the top of the cowl inlet. Works fine and is scarcely visible.

Props are 15/7 Master Airscrew and turn at 8300 on the ground (about 1000 feet asl). Exact scale would be a 17 inch diameter prop, but in three blader that would be too much for the 125s. If the budget permits, I would like to try a Xoar three blade in 16/5. A 16/4 Zinger three blade turns 8400 on the ground, but I would be concerned about having sufficient airspeed with that low a pitch.
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Old 11-27-2013, 05:31 PM
  #255  
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Congrats GoNavy nice job...any video coming?
Old 11-27-2013, 06:07 PM
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SteveD: Maybe in the next flying season. We are 400 miles SW of you, with 5 inches of snow, and it's 10 degrees F.
Old 11-29-2013, 06:03 AM
  #257  
John La Belle
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Hi Tom; looks like all the time and work has paid off with a great looking plane, hope she flies as well as it looks. Hope you have a lot more flights with her. What was your final weight and do the 125's have plenty of power. congrats on you first flight and a fine looking model cheers John
Old 11-29-2013, 11:17 AM
  #258  
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Hey John, good to hear from you!

I don't have a final weight figure. My scale only goes to 24 pounds. Have to find another.

One thought I had about weight: You may recall we had one of the first laser cut short kits, and that cutter used a 1/8 inch plywood that came from Asia, I believe. It is stiffer than the plywood made from Poplar (or as we say in these parts, "popple", or "lite ply"), but it is also much heavier, 50% heavier by my measurements! With the 1/4 and 1/8 inch structural components, and most of the wing ribs cut from that plywood, there was a significant weight gain over Poplar, and I think many of those ribs could have been balsa, all of which could have saved a pound or more overall.

I took only a single flight that day. The 125s were up to the task, though with little wind, grass runway, and a fairly short one at that, we were airborne none too soon. In the air she would climb on less than half throttle.

I did not use flaps. My heart rate was up there for the first flight, and I didn't feel up to flap and elevator mixing.

It flew very well, but I tended to over control: I am going to reduce the power to the servos from 6.0 to 4.8 volts. I do not have exponential available.

I will check the balance, again, after changing the servo battery pack. I thought we were at the spot shown on the plans, but I wondered if a little more nose weight would have added stability.

Landing was a hot, again, without flaps or headwind, and I dinged the front fork, but only a little...taxied it back home just fine.

One other comment: The landing lights in the wing leading edge and the red rotating beacon on the top of the fin, add a real nice touch. These were the Ram units, on 9 volts, and they are very bright! . All are visible even in the sunlight. These are controlled by a relay operated by the landing gear channel.

My congratulations to you, John, for such a beautiful model and all your help along the way. I know you invested a lot of skill and effort in those plans.

I think we might win a "best of" at a fun fly next summer.
Old 05-04-2014, 11:13 AM
  #259  
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Anybody working on their twotter?Mines on deck,just finishing up some other projects...
Old 05-06-2014, 05:42 PM
  #260  
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Steve:

Mighty quiet on this thread. How about a recent photo of your project?
Old 05-06-2014, 06:59 PM
  #261  
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Just about have this T/F FW190 ready for paint(stripped the monocote and glassed it),just finished adding rivits and panel lines.Also am finishing up a GTM Fokker D7,its almost ready for covering.Just a lot of little jobs to get these done and get on with the twin otter.. How did you make out with yours?
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Old 04-25-2017, 05:24 PM
  #262  
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Default AdsTwin Otter 130"

Originally Posted by Lins
Does anyone know of any other large twin otter kits around?
, inches.
Yes. Try amamodels , Tim. There you can go for a short kit and plans for 130".
Cutter seems to be slow, but I have time and plan to wait it out.
Old 04-25-2017, 05:55 PM
  #263  
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Nice to see some life on this old thread! Does AMA Models have a website? Nothing came up but I do see lots of their kits on eBay.
Old 05-02-2017, 06:16 PM
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Thailazer , check out this site. Seek and you shall find.
johnsplansandkits.com
just ordered mine and even the engine cowls in fiber glass. For front gear , the Robart # 684 , all 5" tires.
Good luck
Richard from P.R.
Old 05-02-2017, 10:35 PM
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Hi Ricardo,
Judging from John's website the nosewheel strut looks more like the Ziroli Stuka strut rather than the indicated 684. I do not know whether, in fact, these are one and the same but in John's website they sure look like the Stuka version. May I ask whether one needs any more machining to the indicated 684 strut given that these need to be secured in the aluminium gear mounting block and also one needs to make a steering attachment to the strut. Wonder if these items are also readily available too.

Reuben
Old 02-27-2019, 09:32 AM
  #266  
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Hi all,
I am desperately searching for any decent 3 views with cross sections or best, any factory drawings / blueprints about the twin otter. Any pictures on landing gears, flaps / ailerons systems are welcome...
I am planning a 1/5 scale long nose version.
Also, I have tried to reach John La Belle's website without success...any news?
jerome
Old 02-27-2019, 12:14 PM
  #267  
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Default Twin otter

..

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Old 02-28-2019, 05:33 AM
  #268  
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I have one of John's short kits and assembly DVD for sale if you are interested. I also have a lot of photos of my Otter build. I believe there are detailed 3 view drawing by Chris Bowley of the 200/300 series sold on the internet.
Old 03-01-2019, 07:32 AM
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Reuben, Hank,
thank you for your answer, I did found some basic 3 views on the internet, but I am looking for more official ( factory ) documents...anyways for now, I am collecting pictures from internet. Also, I will try to get in touch with Twin Otter maintenance centers, they might have some old blueprints laying on their tablets...I do have few people to get in touch with...see what happens!

Hank, sure I might be interested with the short kit. I'll get in touch as soon as I have some spare time.
jerome
Old 03-01-2019, 07:38 AM
  #270  
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Default twin otter

Originally Posted by hakoakoa
Reuben, Hank,
thank you for your answer, I did found some basic 3 views on the internet, but I am looking for more official ( factory ) documents...anyways for now, I am collecting pictures from internet. Also, I will try to get in touch with Twin Otter maintenance centers, they might have some old blueprints laying on their tablets...I do have few people to get in touch with...see what happens!

Hank, sure I might be interested with the short kit. I'll get in touch as soon as I have some spare time.
jerome
I have all the factory documentation from Viking air.

Hank
Old 03-01-2019, 12:40 PM
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PM sent
Old 03-02-2019, 07:47 PM
  #272  
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Originally Posted by hakoakoa
Hi all,
I am desperately searching for any decent 3 views with cross sections or best, any factory drawings / blueprints about the twin otter. Any pictures on landing gears, flaps / ailerons systems are welcome...
I am planning a 1/5 scale long nose version.
Also, I have tried to reach John La Belle's website without success...any news?
jerome
I've got the Minature Aircraft plans for the 126 inch version and it has excellent formers. If you get in a bind, I could copy just those for you and mail them which you could reduce to your scale.
Old 03-03-2019, 05:50 AM
  #273  
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I was lucky enough just last week to purchase one of Johns Twin Otters, I believe it was one of the prototypes.
Old 03-03-2019, 07:35 PM
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gear available PM if interested
Old 03-03-2019, 07:37 PM
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