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1/6 SCALE TWIN OTTER BUILD

Old 07-31-2011, 08:56 AM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

first bottom wig skin glueing...used aluminum angle to keep everything straight and to also keep the washout correct..so far so good
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Old 08-01-2011, 12:46 PM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

Well, just ordered the strut and thrust bearing. I'll see if Robart adds the extra mounting plate. If not, I'll try a nice collar clamp for the bottom. Guess I'll start keeping an eye out for servos and receiver as well.

Edit: I think I'll go all digital servos. I think I'll try eliminating 2 elevator servos, just get one ultra high torque. I have all JR's in my Extra, but a lot of people seem to really like the Hitecs, so I'll try those on this plane.
Old 08-01-2011, 09:22 PM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

Lins, I wouldn't do digital servos unless they were cheap. This airplane won't need them. The Ziroli AC-47 that we flew never required much servo for the surfaces. Flys too slow and I don't see 3D as an option. As far as eliminating weight of an extra servo, The elevator is the only surface you can't cheat on. One half working is better than none. You will have too much building time into the airplane.
Old 08-02-2011, 03:23 AM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

Lins, Hitec 5645 digitals are a good buy, they are inexpensive compared to others and have plenty of torque on 6 volts.I just finished a 1/3 BUSA Super Cub that has em,and they work great.If your on 2.4 ghz go digital..
I'm in the process of moving so no building for me till the fall on this project..
Old 08-02-2011, 06:20 AM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

back to more building..too HOT outside to do anything else. they are calling for 109 today..these are the wingtip blocks.. made them from 1/4" sheet light balsa laminated together
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Old 08-02-2011, 06:36 AM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

SteveD, yeah I'm thinking that servo for the nose gear steering, but I think it will be the 'weakest' servo I will be using. It's surprising how strong you think your servos are, then wonder where some of the weird 'quirks' and 'glitches' come from. This should be a slow and gentle flying aircraft, but it is 40 lbs, and might benefit from some spare servo strength in a bad situation.
Old 08-02-2011, 07:17 AM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

Some day I'd like to go to Yellowknife for a photo shoot,for my aviation art business.Lots of Twin Otters up there for reference eh Lins?
Old 08-02-2011, 07:23 AM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

Just a few! Some nice older aircraft like DC-3s, 4's, and C-46s as well! I'm a helicopter guy, though by trade. We just had the float plane fly in a couple weekends ago. There was a Beech 18 on floats here last year for a bit. The Royals, Will and Kate were here a little while ago, there are pictures and video floating around with my daughter meeting both of them! It's a funny little town...
Old 08-02-2011, 10:59 AM
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I'm currently looking at AXI 5345 HD's to power mine. That with a couple 10S packs, according to Model Motors specs, should be good for 43lbs. With 12S packs, they will be good for 57lbs! That is with a very large prop though (24), so I'll contact Model Motors to double check smaller props won't overspeed them too badly, or I'll have to go with smaller motors. That's doesn't include the weight of such a system which I still need to add up. I think John had mentioned 5320s or 5330s somewhere before. I messaged him for more info already.
Old 08-02-2011, 01:06 PM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

gblas, I'm assuming you did not use all the little 2-56 screws as called for in the plans for the hinges? I wanted to pass on that step, and just use some nice Hysol from work if possible. That stuff never lets go! Nice idea on the 1/64 ply as well.
Old 08-02-2011, 01:22 PM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

lins...i didnt go all the small screws route. went with a good 1 hour epoxy...these hinges are not coming out. plenty strong enough... the 1/64 ply worked really well. i think you will be pleased if you use it..easy to work with and conforms really nice to the aileron and flap gap
Old 08-02-2011, 01:26 PM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

got the wing tip blocks ready to glue on...took a little time to get the holes drilled for the nav and strobe light wiring
Old 08-02-2011, 02:06 PM
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wing tips and leading edges glued to outboard wing panels..time for some sanding to shape
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Old 08-02-2011, 02:37 PM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

I'm not even sure what the plan calls for at this point instead of the 1/64 ply. That's way ahead of me at this point. I will be doing my sheet order in a couple weeks probably. I think I have some very thin ply from packing for my 75cc Extra. I think there is plenty of surface area for those hinges to not put in any of the screws. I don't think there is much cross section to a 2-56 screw to hold a hinge in place anyway!
Old 08-02-2011, 04:32 PM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

lins.. i think you will find that a goodepoxy is plenty strong enough to hold the hinges in.especially since the ribs and hinges are ply.once glued you are not going to break those apart.was going to sand some of the wing tip blocks but it is way to HOT in the garage..
looks like will have to continue with other things..17 yrs in texas and still waiting on winter
Old 08-02-2011, 05:50 PM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

I was in Houston a few years ago for HAI. Makes me wonder what I'm doing here when it's t-shirt weather in February down there! I wouldn't be able to handle the heat and humidity, though.
Old 08-02-2011, 08:48 PM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

gblas, are you remembering to leave provisions for installing the extra fences on the horizontal for when the floats go on?
Old 08-03-2011, 02:32 PM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

As usual Gene plane is looking great...................Too hot?????? here? Never too hot!

Just roll with the flow and keep the girls in sight!

Sheldon
Old 08-03-2011, 03:39 PM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

hey shedon...way to hot for me....i am a yankee....i like the cold...anyway
decided to get some of the center section wiring installed..here is a few pics of the wiring being measured out through the center section not that difficult..just takes a littlethought to where everything goes
the wing center takes the most wiring.thats where it all comes together.....more pics to follow
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Old 08-03-2011, 03:43 PM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

and yes all the wiring is labeled so i know each one goes...trying to make it murphy proof so it canot be hooked up wrong
Old 08-03-2011, 04:24 PM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

Wiring looks like a challenge.

gb
Old 08-03-2011, 05:46 PM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

Looks like more wiring than an A380! You should think about 1 big cannon plug for that!!
Old 08-04-2011, 01:31 AM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

Hi Lins; Hanks electris specs. you were asking about are- weight 48 lbsbolly props 19x11 3 blades-axi 5330/18 motors-esc 100 amp thunder power batteries 5 amp 8s-cruise 35 watts per lb-1700 watts per min. but when I win the megabucks I would still want the syssa like Gene's cheers John
Old 08-04-2011, 05:08 AM
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Thanks John!
Old 08-04-2011, 09:14 AM
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Default RE: 1/6 SCALE TWIN OTTER BUILD

i think i am going to look into one main plug for the center where all the leads meet in the middle. there will be a total of 12 different leads. six for servos and the other six for lights so one plug will make things much easier..looks like a trip to radio shack and see what they have..
so far the airframe as it was in the previous outside pics i took is right at about 20lbs without engines...trying to build this to get it in at about 35 lbs
looks like it will be close..john..wondering how much weight did you need to balance yours? and was it nose or tail heavy?

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