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  #81  
Old 06-10-2019, 11:05 AM
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Isaac Isaac is offline
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Exclamation Wing tips housing

The Yak-25M has its main landing gears in the fuselage ( bicycle arrangement ). For ground stability, the aircraft had small outrigger struts with small wheels housed in a canoe type housing in the wing tips.


Here are the parts
Yak-25M ( twin engine jet ) GPM #546-img_9554.jpg

assembled
Yak-25M ( twin engine jet ) GPM #546-img_9544.jpg
Yak-25M ( twin engine jet ) GPM #546-img_9546.jpg

and glued on the wings. ( the opening is on the bottom and will house the struts later on ).
Yak-25M ( twin engine jet ) GPM #546-img_9555.jpgYak-25M ( twin engine jet ) GPM #546-img_9556.jpgYak-25M ( twin engine jet ) GPM #546-img_9549.jpg


underside view
Yak-25M ( twin engine jet ) GPM #546-img_9552.jpg


Isaac
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  #82  
Old 06-11-2019, 11:27 AM
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Thumbs up Wheels

The landing gear consists of a single nose wheel and a double set of wheels in the back of the fuselage ( there are also small outrigger wheels at the wing tips ).

The laser frames has a set of disks
Yak-25M ( twin engine jet ) GPM #546-img_9558.jpg


laminate and glue together. Notice that the center is missing and is to be built separately.
Yak-25M ( twin engine jet ) GPM #546-img_9559.jpg


I inserted temporary hubs to allow me to spin the wheels so I can shape on my mini lathe ( you can use any rotating drill device ).
Yak-25M ( twin engine jet ) GPM #546-img_9560.jpg


place in the lathe
Yak-25M ( twin engine jet ) GPM #546-img_9561.jpg

turn and sand to shape
Yak-25M ( twin engine jet ) GPM #546-img_9562.jpg


remove the center temporary hub
Yak-25M ( twin engine jet ) GPM #546-img_9563.jpgYak-25M ( twin engine jet ) GPM #546-img_9564.jpg


Here are all 3 wheels shaped.
Yak-25M ( twin engine jet ) GPM #546-img_9566.jpgYak-25M ( twin engine jet ) GPM #546-img_9567.jpg

nice


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  #83  
Old 06-11-2019, 12:46 PM
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Exclamation Wheels continued

At this point, The wheels are painted black rubber color
Yak-25M ( twin engine jet ) GPM #546-img_9569.jpgYak-25M ( twin engine jet ) GPM #546-img_9570.jpg

I added a simplified version of the wheel rims since most of it will not be visible anyhow. It is painted green which is common to all Soviet jets.

Yak-25M ( twin engine jet ) GPM #546-img_9572.jpg


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  #84  
Old 06-11-2019, 03:42 PM
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Butelczynski Butelczynski is offline
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I find it interesting how so many aircraft were designed with bicycle type of a landing gear in 1950/60s and I can't think of any designed in last 20 years.

At the same time B-52,U-2 and possibly Harriers are still buzzing around

Nice build Issac.I like your wingtip pods-I had hell of a time with mine even with their much simpler design.
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  #85  
Old 06-11-2019, 09:57 PM
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Exclamation

Quote:
Originally Posted by Butelczynski View Post
I find it interesting how so many aircraft were designed with bicycle type of a landing gear in 1950/60s and I can't think of any designed in last 20 years.

At the same time B-52,U-2 and possibly Harriers are still buzzing around

Nice build Issac.I like your wingtip pods-I had hell of a time with mine even with their much simpler design.
The bicycle landing gear in my opinion is a bad compromise. It trades off a lighter and more flexible wing to a fuselage that loses precious volume to house a landing gear. All that space could be used for fuel and equipment . Also, this design makes the plane wobly on the ground during turns. So handling is poor compared to tricycle gear .


It was a dead end concept. However, if you have a twin fuselage aircraft, then this concept is still usefull, like the new space launcher planes. But those are specialized one off designs.google Stratolaunch aircraft.


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  #86  
Old 06-12-2019, 08:42 AM
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Great job on the tires, model coming along really nicely
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  #87  
Old 06-12-2019, 10:44 AM
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Cool Main aft landing gear

The aft main gear has a single large pivoting arm that retracts aft. The shock absorbing damper is connected on the inside and takes all the landing load.

Since the assembly is mostly buried inside the aft gear bay it will not be visible, so you decide how much detail you want there. The most important thing is that it is structurally strong enough to support the plane.

I added a metal paper clip to support the pivot axle to the wheels axle. Use super glue .
Yak-25M ( twin engine jet ) GPM #546-img_9573.jpgYak-25M ( twin engine jet ) GPM #546-img_9574.jpgYak-25M ( twin engine jet ) GPM #546-img_9575.jpg


test fit the wheels on.
Yak-25M ( twin engine jet ) GPM #546-img_9577.jpg

glue the inner skin on the leg. No worries about the job, it will not be seen when assemble to the plane. Get ready to paint it.
Yak-25M ( twin engine jet ) GPM #546-img_9578.jpg

paint the leg grey
Yak-25M ( twin engine jet ) GPM #546-img_9579.jpg


here is the leg.
Yak-25M ( twin engine jet ) GPM #546-img_9580.jpg


now the strut/damper/ actuator. Again, say goodbye as you will not see it. However, it is a structural part and needs adjustments. It will be removed when the leg is glued on and then inserted and attached to the leg.
Yak-25M ( twin engine jet ) GPM #546-img_9581.jpgYak-25M ( twin engine jet ) GPM #546-img_9583.jpg


Install the leg
Yak-25M ( twin engine jet ) GPM #546-img_9585.jpg


and wheels are on.
Yak-25M ( twin engine jet ) GPM #546-img_9586.jpgYak-25M ( twin engine jet ) GPM #546-img_9588.jpgYak-25M ( twin engine jet ) GPM #546-img_9589.jpgYak-25M ( twin engine jet ) GPM #546-img_9590.jpg


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  #88  
Old 06-12-2019, 02:01 PM
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Cool Retract animation

Here is a set of pictures I took showing the retraction of the rear main gear.

Once loaded, click quickly forward and back to get the sense of it.

Yak-25M ( twin engine jet ) GPM #546-img_9592.jpgYak-25M ( twin engine jet ) GPM #546-img_9593.jpgYak-25M ( twin engine jet ) GPM #546-img_9594.jpgYak-25M ( twin engine jet ) GPM #546-img_9595.jpgYak-25M ( twin engine jet ) GPM #546-img_9596.jpgYak-25M ( twin engine jet ) GPM #546-img_9598.jpg


Isaac
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  #89  
Old 06-13-2019, 04:55 AM
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Nice work Issac

the model looks fantastic.
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  #90  
Old 06-13-2019, 06:53 AM
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Exclamation Status pics

Here is the model so far

Yak-25M ( twin engine jet ) GPM #546-img_9618.jpgYak-25M ( twin engine jet ) GPM #546-img_9620.jpgYak-25M ( twin engine jet ) GPM #546-img_9621.jpgYak-25M ( twin engine jet ) GPM #546-img_9622.jpgYak-25M ( twin engine jet ) GPM #546-img_9623.jpg


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