1/3 scale Japanese vintage glider Mita type 3

Let us all watch your new project progress.
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norm
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Re: 1/3 scale Japanese vintage glider Mita type 3

Post by norm » 17 Nov 2019, 13:41

Adam C and RobbieB, Thanks for your comments. I will check the epoxied joints before every flight and inform you if anything wrong would be found.
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Jolly Roger
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Re: 1/3 scale Japanese vintage glider Mita type 3

Post by Jolly Roger » 17 Nov 2019, 19:40

What a beautifully engineered model and a really atmospheric video. I love the long shadows and rich sunlight of early morning / late evening.

Yes that landing area is a little cosy! But the model was flown very skillfully.

I experimented with gluing carbon tubes together for my 1/3 scale cub undercarriage and found the joints far too fragile for the shock of landing loads, so I created the strength from the carbon tows and epoxy pulled through the tubes. However I think in a large interconnected frame like your fuselage, the parts support each other so I think it may be strong enough.

One last thing - I hope you took great care to avoid breathing in the carbon dust as it is highly toxic. :)

Thanks for posting.
Roger
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Main frames.jpg

Jolly Roger
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Location: Sutton Bank, North Yorkshire

Re: 1/3 scale Japanese vintage glider Mita type 3

Post by Jolly Roger » 17 Nov 2019, 21:59

Some further info on the Mita...
Attachments
Mita.jpg

norm
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Re: 1/3 scale Japanese vintage glider Mita type 3

Post by norm » 18 Nov 2019, 14:21

Rojer, Thank you for your comment.
Yes our field is small because Japn is composed from small mountainious islands. There is little open space.
How I want to fly my models in Europe!

Norm
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norm
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Re: 1/3 scale Japanese vintage glider Mita type 3

Post by norm » 19 Nov 2019, 13:24

Landing Gear
The Mita has a landing gear which has a single wheel supported by two rubber shock absorbers. I simulated it in my model.
Attached, you can find the drawing, parts cutted from carbon sheet/pipe and the assembled gear.
Attachments
脚図面.png
Landing Gear Drawing
脚部品.png
Parts of the L/G
脚組立.png
L/G Assy
Last edited by norm on 19 Nov 2019, 13:55, edited 1 time in total.
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Cliff Evans
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Re: 1/3 scale Japanese vintage glider Mita type 3

Post by Cliff Evans » 19 Nov 2019, 13:45

Very nice engineering Norm.

norm
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Re: 1/3 scale Japanese vintage glider Mita type 3

Post by norm » 20 Nov 2019, 08:02

Horizontal Tail

Horizontal tail of the 1/3 Mita is a quite conventional one, made of balsa ribs and spars. The stabilizer is planked with balsa sheet. The elevator has diagonal ribs and is not planked. Right elevator has a dummy tab. Elevator hinges are made of carbon plate, acrylic plate and bamboo rods. Both stabilizer and elevator were build on the jigs.
Attachments
水尾図面.png
Horizontal Tail Plan
エレベータ治具.png
Elevator Jig
水尾部品.png
Elevator Parts
エレベータ組立完.png
Elevator Completed
水平安定板.jpg
H-Stab. with Elev. Hinges
水尾組立完.png
H-Tail Assy
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norm
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Re: 1/3 scale Japanese vintage glider Mita type 3

Post by norm » 21 Nov 2019, 11:00

Elevator Control Sys

The elevator control system of the original Mita is a linkage half by rods and the rest by wire. There are two bell cranks, one at the middle and the other at the end of the fuselage. Two rods connect the pilot sticks and the foward bell crank. Between the bell cranks there is a wire linkage and the elevator is connected to the aft bell crank by a connecting rod.

My 1/3 scale model simulates this system. A servo is placed under the aft pilot seat and connected to the linkage rod. Thus the control sticks moves for and aft in accordance with the elevator up and down.
Attachments
エレベータ操縦機構図.png
Elevator Control sys Drawing
ジンバル搭載.png
Stick Gimbals installed
エレベータサーボ.png
Elevator Servo and FWD Bell crank
エレベータベルクランク.png
FWD Bell crank detail
エレベータコントロールワイヤー.png
Wire linkage between bell cranks
エレベータベルクランク2.png
AFT Bell crank
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norm
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Re: 1/3 scale Japanese vintage glider Mita type 3

Post by norm » 23 Nov 2019, 01:22

Vertical Tail
The vertical tail of the Mita has similar structure with the horizontal one, planked fin and non-planked rudder with oblieque ribs. In the 1/3 model, these are all made of balsa except the fin spar which is made of cypress. The rudder has two hinges, mid and bottom, and it can be put on/off the fin easily. Both the fin and the rudder were assembled on jigs made of balsa.
Attachments
Vertical Tail Plan.png
Vertical Tail Plan
Vertical Stab Parts.png
Fin Parts
Rudder Parts.png
Rudder Parts
Rudder Construction.jpg
Rudder Assembling on a Jig
Vertical Fin Assembled.png
Fin assembled
Rudder Assembled.png
Rudder assembled
Vertical Tail ASSY.png
Vertical Tail Assembled
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norm
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Re: 1/3 scale Japanese vintage glider Mita type 3

Post by norm » 24 Nov 2019, 06:24

Rudder Control Sys
The rudder control system has a conventional wire linkage. There are four turnbuckles, two in between the front and aft pedals and two in between the aft pedals and the rudder. I made these turnbuckles from 5 mm dia bruss rod. The pedals are made of bruss tubes. The rudder servo is placed just after the front pedals and is linked with them. It works as the pilot feet. Behind the servo there is an instrument panel, so the servo can't seen from outside.
Attachments
Rudder Control Plan.png
Rudder Control Sys DWG
Rudder Pedals.png
Rudder Pedals
Front Pedals with Servo.png
Front Pedals with Servo
AFT Pedals Installed.png
Aft Pedals with Turnbuckles
Turnbuckle.png
Aft Turnbucles
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