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  #21  
Old 05-01-2019, 01:50 PM
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Isaac Isaac is offline
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Thumbs up Wood plug

OK, plan B for a vacuform plug.



This time, I decided to make the plug out of wood.


I started with a 2" diameter wood dowel from a local hardware store.
Yak-25M ( twin engine jet ) GPM #546-img_9291.jpg

start turning on my mini lathe
Yak-25M ( twin engine jet ) GPM #546-img_9293.jpgYak-25M ( twin engine jet ) GPM #546-img_9294.jpgYak-25M ( twin engine jet ) GPM #546-img_9297.jpg

and the finished plug.
Yak-25M ( twin engine jet ) GPM #546-img_9299.jpgYak-25M ( twin engine jet ) GPM #546-img_9300.jpg


trial fit, great !!!!!!
Yak-25M ( twin engine jet ) GPM #546-img_9301.jpgYak-25M ( twin engine jet ) GPM #546-img_9302.jpg


Next stop is to vacuform the nose.



Isaac
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  #22  
Old 05-01-2019, 10:27 PM
YOAVHOZMI YOAVHOZMI is online now
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good work with the wood...it looks very good.

YOAV
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  #23  
Old 05-02-2019, 03:58 AM
Abir Merlin Abir Merlin is offline
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Issac so meny skills , it's looking good.
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  #24  
Old 05-02-2019, 06:58 AM
ricleite ricleite is offline
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Definitely smoother than paper! I bet that this model will not require nose ballast
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  #25  
Old 05-02-2019, 02:40 PM
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Exclamation

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Originally Posted by ricleite View Post
Definitely smoother than paper! I bet that this model will not require nose ballast
I will not use the wood nose for this kit. It will be a plug and I will vacuform a nose out of PETG plastic .


As for ballast, this airplane has what is called a bicycle landing gear in the fuselage ( front of the CG, and back of the CG ), so for a model it makes no difference as to the ballast. Just some trivia.


Isaac
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  #26  
Old 05-02-2019, 03:35 PM
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Butelczynski Butelczynski is online now
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My biggest problem with petalike that are edges of paper I can't touch up with pencil.Those white edges always show up no matter how I try to color them.

If you can get around it with vacu formed nose go for it.I'm sure it will be better.
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  #27  
Old 05-02-2019, 03:40 PM
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Originally Posted by Butelczynski View Post
My biggest problem with petalike that are edges of paper I can't touch up with pencil.Those white edges always show up no matter how I try to color them.

If you can get around it with vacu formed nose go for it.I'm sure it will be better.
Here it comes! My vacuformed nose in the next post.


Isaac
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  #28  
Old 05-02-2019, 03:55 PM
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Smile Vacuformed nose section

Now that the wood plug is ready, lets vacuform it.


I had lots of PETG plastic sheets of 0.030 inches thick, so I decided to give it a try. It took me 3 tries to get it right.

The main difference to success is to limit the oven time at 350 degrees F to 45 seconds.
Yak-25M ( twin engine jet ) GPM #546-img_9304.jpg

Also, I modified the plug slightly to allow for its easy removal from the plastic. I added a screw to the back so I can rock the plug a bit from side to side and then pull it out. Also, I added a little material using tape so the plastic still has a positive extraction shape.
Yak-25M ( twin engine jet ) GPM #546-img_9310.jpgYak-25M ( twin engine jet ) GPM #546-img_9312.jpgYak-25M ( twin engine jet ) GPM #546-img_9313.jpg


Here is the finished nose
Yak-25M ( twin engine jet ) GPM #546-img_9309.jpgYak-25M ( twin engine jet ) GPM #546-img_9314.jpg


and initial fit to the test paper section going aft. Looks OK.
Yak-25M ( twin engine jet ) GPM #546-img_9323.jpg


Now, I decided to paint the nose dark grey ( note : The exact match to the paper is not critical since the real aircraft had this nose separate from the fuselage and some operational aircraft may have even had different shades of grey as well ).
Yak-25M ( twin engine jet ) GPM #546-img_9338.jpg
Yak-25M ( twin engine jet ) GPM #546-img_9340.jpgYak-25M ( twin engine jet ) GPM #546-img_9341.jpgYak-25M ( twin engine jet ) GPM #546-img_9342.jpg


fit again
Yak-25M ( twin engine jet ) GPM #546-img_9343.jpg



I then sprayed the plastic dome with Pledge floor polish which seals in the paint and gives it a bit of a shine. Came out good.
Yak-25M ( twin engine jet ) GPM #546-img_9347.jpgYak-25M ( twin engine jet ) GPM #546-img_9349.jpg


Now it is installed ( will need small touch up due to the very tight fit where the paint got scuffed up ).
Yak-25M ( twin engine jet ) GPM #546-img_9351.jpg

I like it.



Isaac
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  #29  
Old 05-02-2019, 04:53 PM
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MacSongLi MacSongLi is offline
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Very nice work Isaac, it definitely looks better than the petals. That lathe sure comes in handy.


Gary
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  #30  
Old 05-03-2019, 01:29 AM
Boris Boris is offline
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That is a very beautiful piece of work!
Did you use a vacuum box or just pulled over the PETG sheet?
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