View Single Post
 
Old 05-02-2019, 03:55 PM
Isaac's Avatar
Isaac Isaac is offline
Member
 
Join Date: Oct 2010
Location: Dayton Ohio
Posts: 6,257
Total Downloaded: 84.39 MB
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
__________________
My gallery [http://www.papermodelers.com/gallery...v-r-6&cat=500]
Recent buildsMig-15UTI, Su-9(1st), Ouragan, Kfir-C7, Mirage 3C, F-84F, F-104G, Mystere 4A
Reply With Quote