Go Back  RCU Forums > RC Airplanes > Pylon Universe - RC Pylon Racing > Scale Racing
Reload this Page >

8th Scale Aviation's, "CzechMate" Short-kit, Group build

Notices
Scale Racing Discuss all aspects of semi-scale pylon racing.

8th Scale Aviation's, "CzechMate" Short-kit, Group build

Old 06-17-2016, 09:51 PM
  #251  
Iron Dog
Thread Starter
 
Iron Dog's Avatar
 
Join Date: Feb 2009
Location: Sacramento, CA
Posts: 1,347
Likes: 0
Received 3 Likes on 3 Posts
Default

Just after we broke for lunch, Eric decided he wanted to try to fly his mini Foamie Warbird around my pastures. I warned him that I had flown my FlyZone Corsair and found it difficult to avoid my many trees. (That’s a nice way of saying, “I crashed into a really tall pine tree, and broke my plane when it fell and impacted the ground, shortly after I moved into this property a couple years ago.”)

Un-phased, Eric decided, “I’m sure I can avoid them!”

Anyone care to guess how that worked out for him? . . .





“Ummm . . . Ollie . . . Now what do I do?!”
Attached Thumbnails Click image for larger version

Name:	IMG_5706.JPG
Views:	294
Size:	928.5 KB
ID:	2168442  

Last edited by Iron Dog; 06-17-2016 at 11:01 PM.
Old 06-17-2016, 10:01 PM
  #252  
Iron Dog
Thread Starter
 
Iron Dog's Avatar
 
Join Date: Feb 2009
Location: Sacramento, CA
Posts: 1,347
Likes: 0
Received 3 Likes on 3 Posts
Default

(He never made it to either of my open pastures.)

This is Eric going net-fishing for a mini-foamie P-47 Warhawk out of another one of my pine trees.

Attached Thumbnails Click image for larger version

Name:	IMG_5705.JPG
Views:	277
Size:	1.14 MB
ID:	2168443   Click image for larger version

Name:	IMG_5709.JPG
Views:	265
Size:	1.19 MB
ID:	2168444   Click image for larger version

Name:	IMG_5719.JPG
Views:	273
Size:	1.23 MB
ID:	2168445  

Last edited by Iron Dog; 06-17-2016 at 11:05 PM.
Old 06-17-2016, 10:16 PM
  #253  
Iron Dog
Thread Starter
 
Iron Dog's Avatar
 
Join Date: Feb 2009
Location: Sacramento, CA
Posts: 1,347
Likes: 0
Received 3 Likes on 3 Posts
Default

After lunch -- and Eric's short flight, we installed the pushrod tubes.

Tim includes the lasercut pushrod keepers, pictured below. Place a pair of these keepers on each of the tubes first. Run the tubes in a straight line, between the servo output arm and the elevator and rudder control horns. Glue the keepers to whichever part of the formers allow a good solid glue-bond, while equally spacing this reinforcement to keep the tube from flexing while under load and that will also keep the tubes straight.

Attached Thumbnails Click image for larger version

Name:	IMG_5721.JPG
Views:	285
Size:	687.8 KB
ID:	2168446   Click image for larger version

Name:	IMG_5722.JPG
Views:	273
Size:	679.4 KB
ID:	2168447  

Last edited by Iron Dog; 06-17-2016 at 11:07 PM.
Old 06-20-2016, 05:12 AM
  #254  
FlyerInOKC
My Feedback: (6)
 
FlyerInOKC's Avatar
 
Join Date: Nov 2004
Location: Oklahoma City, OK
Posts: 13,643
Received 166 Likes on 151 Posts
Default

Originally Posted by Iron Dog View Post
Just after we broke for lunch, Eric decided he wanted to try to fly his mini Foamie Warbird around my pastures. I warned him that I had flown my FlyZone Corsair and found it difficult to avoid my many trees. (That’s a nice way of saying, “I crashed into a really tall pine tree, and broke my plane when it fell and impacted the ground, shortly after I moved into this property a couple years ago.”)

Un-phased, Eric decided, “I’m sure I can avoid them!”

Anyone care to guess how that worked out for him? . . .





“Ummm . . . Ollie . . . Now what do I do?!”
An hour or two and a D9 can fix that problem! ;-)

I like the way the pushrods went in!

Mike
Old 12-06-2016, 10:12 PM
  #255  
Iron Dog
Thread Starter
 
Iron Dog's Avatar
 
Join Date: Feb 2009
Location: Sacramento, CA
Posts: 1,347
Likes: 0
Received 3 Likes on 3 Posts
Default

Alright . . . Race season is over. So, time to get back to posting the progress of our build, thus far, in order to get you all caught-up. We haven't been able to get together very regularly these last few months to continue the build., but were able to do so a couple times in the last month. Now, let's see how well I can remember where we were -- and exactly what we did -- beginning 7 months ago:

After the pushrods were installed, the wing mounting block came next.

First, Tim set the wing into position on the wing saddle. He marked the position of the trailing edge of the wing onto the saddle doubler. Another mark was drawn one inch in front of the initial mark. The width of the fuse was measured between these marks, and a 1" wide piece of plywood was cut (ever-so-slightly oversized), and then carefully sanded to-size, to fit snugly between. If you look carefully at the pictures, you will notice a 1/2" balsa block was cut and sanded to the same width and glued to the center of the plywood wing mounting block.

Tim glued this 2-piece assembly ito position, about 1/16" below the edges of the saddle doubler.

Tri-stock pieces were then glued, as shown, to more carefully secure and reinforce the wing mount block.

Attached Thumbnails Click image for larger version

Name:	IMG_5724.JPG
Views:	267
Size:	697.1 KB
ID:	2192512   Click image for larger version

Name:	IMG_5725.JPG
Views:	260
Size:	747.3 KB
ID:	2192513   Click image for larger version

Name:	IMG_5723.JPG
Views:	252
Size:	769.2 KB
ID:	2192514   Click image for larger version

Name:	IMG_5726.JPG
Views:	276
Size:	794.5 KB
ID:	2192515  

Last edited by Iron Dog; 12-07-2016 at 06:12 AM.
Old 12-06-2016, 10:22 PM
  #256  
Iron Dog
Thread Starter
 
Iron Dog's Avatar
 
Join Date: Feb 2009
Location: Sacramento, CA
Posts: 1,347
Likes: 0
Received 3 Likes on 3 Posts
Default

We then used some of our left-over bamboo skewers to further reinforce the integrity of the bond of the wing mounting block. One hole was drilled into the side of the wing saddle doubler and into the 1/4" ply block, and another hole drilled into the balsa block. (This was completed on both sides.) Epoxy was then applied, and the four skewer lengths were inseted.


Attached Thumbnails Click image for larger version

Name:	IMG_5733.JPG
Views:	254
Size:	711.6 KB
ID:	2192516   Click image for larger version

Name:	IMG_5732.JPG
Views:	261
Size:	721.4 KB
ID:	2192517   Click image for larger version

Name:	IMG_5730.JPG
Views:	281
Size:	654.9 KB
ID:	2192518  
Old 12-06-2016, 10:29 PM
  #257  
Iron Dog
Thread Starter
 
Iron Dog's Avatar
 
Join Date: Feb 2009
Location: Sacramento, CA
Posts: 1,347
Likes: 0
Received 3 Likes on 3 Posts
Default

Eric follows suit:


(Quick note: I was busy taking pictures and wasn't watching carefully, to notice he was using thin CA, instead. He was unable to insert the skewer far enough, or at all, into the blocks before the glue set to have a solid dowel joint. We had to drill-out the skewer, then, try again. Do not use thin CA; if you want to risk thick CA, then you need to work very fast; using epoxy, for this purpose, is recommended.)

Wipe away excess; and when dry, cut the skewers nearly flush to the side of the wing saddle doubler. Sand the dowels/skewers flush.

Attached Thumbnails Click image for larger version

Name:	IMG_5735.JPG
Views:	262
Size:	966.3 KB
ID:	2192519   Click image for larger version

Name:	IMG_5734.JPG
Views:	258
Size:	711.8 KB
ID:	2192520   Click image for larger version

Name:	IMG_5737.JPG
Views:	254
Size:	966.2 KB
ID:	2192521  

Last edited by Iron Dog; 12-07-2016 at 06:27 AM.
Old 12-06-2016, 10:45 PM
  #258  
Iron Dog
Thread Starter
 
Iron Dog's Avatar
 
Join Date: Feb 2009
Location: Sacramento, CA
Posts: 1,347
Likes: 0
Received 3 Likes on 3 Posts
Default

In preparation for fiberglassing the center section of the wing, wood filler was applied around the seam of the panels, and allowed to dry.

While drying, we installed the throttle pushrod to align with both the throttle servo and the position of the carb's control arm of a YS 70 engine. (None of us have actually decided if we are installing a YS 70 or the newer 80, yet.) Eric's wing and fuse are shown in the pictures, below.

Attached Thumbnails Click image for larger version

Name:	IMG_5738.JPG
Views:	262
Size:	649.7 KB
ID:	2192522   Click image for larger version

Name:	IMG_5739.JPG
Views:	251
Size:	723.8 KB
ID:	2192523   Click image for larger version

Name:	IMG_5740.JPG
Views:	256
Size:	810.4 KB
ID:	2192524   Click image for larger version

Name:	IMG_5741.JPG
Views:	270
Size:	819.1 KB
ID:	2192525  
Old 12-06-2016, 10:52 PM
  #259  
Iron Dog
Thread Starter
 
Iron Dog's Avatar
 
Join Date: Feb 2009
Location: Sacramento, CA
Posts: 1,347
Likes: 0
Received 3 Likes on 3 Posts
Default

Our Tettra 350 cc (12 oz.) tanks were prepared. Holes were cut through the firewall to align with the nipples of the regulator.

Attached Thumbnails Click image for larger version

Name:	IMG_5742.JPG
Views:	257
Size:	901.7 KB
ID:	2192526   Click image for larger version

Name:	IMG_5743.JPG
Views:	259
Size:	883.3 KB
ID:	2192527   Click image for larger version

Name:	IMG_5744.JPG
Views:	28
Size:	748.2 KB
ID:	2192528   Click image for larger version

Name:	IMG_5745.JPG
Views:	284
Size:	805.9 KB
ID:	2192529  
Old 12-06-2016, 10:57 PM
  #260  
Iron Dog
Thread Starter
 
Iron Dog's Avatar
 
Join Date: Feb 2009
Location: Sacramento, CA
Posts: 1,347
Likes: 0
Received 3 Likes on 3 Posts
Default

The filler has dried, and the center section of the wing was sanded. A tack cloth removed the dust, and both the top and the bottom of the center section were fiberglassed, using heavy, 3" wide reinforcement tape and Z-Poxy finishing resin.

Attached Thumbnails Click image for larger version

Name:	IMG_5746.JPG
Views:	258
Size:	726.0 KB
ID:	2192530   Click image for larger version

Name:	IMG_5747.JPG
Views:	249
Size:	900.5 KB
ID:	2192531  

Last edited by Iron Dog; 12-07-2016 at 06:17 AM.
Old 12-07-2016, 07:16 AM
  #261  
FlyerInOKC
My Feedback: (6)
 
FlyerInOKC's Avatar
 
Join Date: Nov 2004
Location: Oklahoma City, OK
Posts: 13,643
Received 166 Likes on 151 Posts
Default

You left out the part where one of the builders glues himself to the airplane or was that earlier in the build? ;-)
Old 12-08-2016, 07:47 AM
  #262  
Pylonracr
 
Pylonracr's Avatar
 
Join Date: Apr 2011
Location: Reno, NV
Posts: 918
Likes: 0
Received 5 Likes on 5 Posts
Default

Or glues the plane to the bench. We all do that right??? Wait, is it just me???
Old 12-08-2016, 08:00 AM
  #263  
FlyerInOKC
My Feedback: (6)
 
FlyerInOKC's Avatar
 
Join Date: Nov 2004
Location: Oklahoma City, OK
Posts: 13,643
Received 166 Likes on 151 Posts
Default

Originally Posted by Pylonracr View Post
Or glues the plane to the bench. We all do that right??? Wait, is it just me???
Sigh, I think it is as common as gluing oneself to the airplane.
Old 12-08-2016, 05:34 PM
  #264  
Tommy_Gun
 
Tommy_Gun's Avatar
 
Join Date: Apr 2004
Location: Locust Grove, Va
Posts: 1,404
Likes: 0
Received 1 Like on 1 Post
Default

Open the fuel line holes up a bit larger and use electrical heat shrink to protect the lines going thru the firewall.
Or don't.

Originally Posted by Iron Dog View Post
Our Tettra 350 cc (12 oz.) tanks were prepared. Holes were cut through the firewall to align with the nipples of the regulator.

Old 12-08-2016, 07:09 PM
  #265  
Iron Dog
Thread Starter
 
Iron Dog's Avatar
 
Join Date: Feb 2009
Location: Sacramento, CA
Posts: 1,347
Likes: 0
Received 3 Likes on 3 Posts
Default

Originally Posted by Tommy_Gun View Post
Open the fuel line holes up a bit larger and use electrical heat shrink to protect the lines going thru the firewall.
Or don't.
After my experience at the NATS, that sounds like advice well worth taking!

My flight to Indianapolis was delayed, and by the time I finally arrived at AMA HQ, I only had enough sunlight left the day for one test flight. That flight was cut short when my P-39 developed a leak in the fuel system and dead-sticked. I landed safely, and replaced the entire fuel system just before dark. Went up early in the morning, to finally try to finally get some timed laps on the course, and even with all new equipment and lines, dead-sticked again. This time, was too low and on wrong end of runway for such ridiculously strong winds. Came up a couple feet short, and ripped the wing mounting blocks out of the fuse. I was forced to compete with my back-up, which I had just maidened. Needless to say, the competition didn't go so well, for me.

Both times, I found a pin-hole in a fuel line. Better to eliminate the risk of similar issues, when so easy to do so. With the P-39, I think it was the lines finding a fiberglass "needle." But have experienced pin-holes in the lines, where they come into contact with the firewall, a number of times over the last 20+ years, too. So, will take your suggestion, as well as wrap the rest of the length of the lines (as much as practical), to insulate them from friction for the rest of their run to the fuel tank.

In competition, reliability and consistency is critical. Good suggestion, Tommy.

Last edited by Iron Dog; 12-08-2016 at 08:00 PM.
Old 12-10-2016, 11:34 AM
  #266  
tdstaf
My Feedback: (11)
 
tdstaf's Avatar
 
Join Date: Apr 2005
Location: sacramento, CA
Posts: 558
Likes: 0
Received 2 Likes on 2 Posts
Default

Originally Posted by Iron Dog View Post
We then used some of our left-over bamboo skewers to further reinforce the integrity of the bond of the wing mounting block. One hole was drilled into the side of the wing saddle doubler and into the 1/4" ply block, and another hole drilled into the balsa block. (This was completed on both sides.) Epoxy was then applied, and the four skewer lengths were inseted.



What do you mean left over? I think we have enough left over for 50 airplanes.
Old 12-10-2016, 11:36 AM
  #267  
tdstaf
My Feedback: (11)
 
tdstaf's Avatar
 
Join Date: Apr 2005
Location: sacramento, CA
Posts: 558
Likes: 0
Received 2 Likes on 2 Posts
Default

Originally Posted by FlyerInOKC View Post
You left out the part where one of the builders glues himself to the airplane or was that earlier in the build? ;-)
Don't worry I'm pretty sure it happened many times....
Old 12-10-2016, 11:37 AM
  #268  
tdstaf
My Feedback: (11)
 
tdstaf's Avatar
 
Join Date: Apr 2005
Location: sacramento, CA
Posts: 558
Likes: 0
Received 2 Likes on 2 Posts
Default

Originally Posted by Pylonracr View Post
Or glues the plane to the bench. We all do that right??? Wait, is it just me???
This one too...
Old 12-11-2016, 09:55 PM
  #269  
Iron Dog
Thread Starter
 
Iron Dog's Avatar
 
Join Date: Feb 2009
Location: Sacramento, CA
Posts: 1,347
Likes: 0
Received 3 Likes on 3 Posts
Default

Time to make cowl molds!

In order to show Tim and Eric my methods for making molds, we are making them for both the CzechMate and Tim's new Rare Bear kit. That way, they can each do one. Simultaneosly, I am demonstrating by making a third -- a P-40 mold for my buddy Sergio. All three will be 2-part molds.

Pictures of the CzechMate and Rare Bear plugs, with the parting surfaces mounted; and, after all was waxed and PVA (thus the green tint) applied.

Attached Thumbnails Click image for larger version

Name:	IMG_5843.JPG
Views:	251
Size:	790.8 KB
ID:	2193187   Click image for larger version

Name:	IMG_5844.JPG
Views:	252
Size:	852.2 KB
ID:	2193188   Click image for larger version

Name:	IMG_5845.JPG
Views:	255
Size:	1.03 MB
ID:	2193189  
Old 12-11-2016, 10:05 PM
  #270  
Iron Dog
Thread Starter
 
Iron Dog's Avatar
 
Join Date: Feb 2009
Location: Sacramento, CA
Posts: 1,347
Likes: 0
Received 3 Likes on 3 Posts
Default

The gaps between each plug and parting surface were filled with microballoons and resin. The following week, after curing-out, the whole assembly was sprayed with PVA again, then the tooling layer got "painted-on." Tim took Rare Bear, and Eric handles the duties on CzechMate:

Attached Thumbnails Click image for larger version

Name:	IMG_5849.JPG
Views:	255
Size:	773.0 KB
ID:	2193190   Click image for larger version

Name:	IMG_5850.JPG
Views:	258
Size:	851.8 KB
ID:	2193191  
Old 12-11-2016, 10:10 PM
  #271  
Iron Dog
Thread Starter
 
Iron Dog's Avatar
 
Join Date: Feb 2009
Location: Sacramento, CA
Posts: 1,347
Likes: 0
Received 3 Likes on 3 Posts
Default

Radiusing the corners so the fiberglass cloth will drape appropriately without air gaps:

Attached Thumbnails Click image for larger version

Name:	IMG_5852.JPG
Views:	253
Size:	687.6 KB
ID:	2193192   Click image for larger version

Name:	IMG_5853.JPG
Views:	238
Size:	716.7 KB
ID:	2193193   Click image for larger version

Name:	IMG_5854.JPG
Views:	240
Size:	1.14 MB
ID:	2193194  
Old 12-11-2016, 10:17 PM
  #272  
Iron Dog
Thread Starter
 
Iron Dog's Avatar
 
Join Date: Feb 2009
Location: Sacramento, CA
Posts: 1,347
Likes: 0
Received 3 Likes on 3 Posts
Default

November 6th, and the layers of cloth have been applied to the first half of each plug and parting surface:

Attached Thumbnails Click image for larger version

Name:	IMG_5855.JPG
Views:	245
Size:	1.29 MB
ID:	2193195  
Old 12-11-2016, 10:32 PM
  #273  
Iron Dog
Thread Starter
 
Iron Dog's Avatar
 
Join Date: Feb 2009
Location: Sacramento, CA
Posts: 1,347
Likes: 0
Received 3 Likes on 3 Posts
Default

"Rinse . . . Lather . . . Repeat"

Repeating the process for the 2nd half of the mold. The parting surface was removed, and the flange of the first half serves as the parting surface, now. It was "keyed" with a Dremel and a spherical-shaped cutting bit, so that the 2nd half aligns and "locks" into place with the first.

Here, I am having Eric and Tim each cut their own chopped fiberglass, so they can get the "full" experience (instead of me prepping everything in-advance). Afterwards, the other ingredients were mixed in, and the initial layer was applied -- just as before.

Attached Thumbnails Click image for larger version

Name:	IMG_5856.JPG
Views:	259
Size:	947.8 KB
ID:	2193196   Click image for larger version

Name:	IMG_5857.JPG
Views:	247
Size:	864.1 KB
ID:	2193197  
Old 12-11-2016, 10:37 PM
  #274  
Iron Dog
Thread Starter
 
Iron Dog's Avatar
 
Join Date: Feb 2009
Location: Sacramento, CA
Posts: 1,347
Likes: 0
Received 3 Likes on 3 Posts
Default

December 3rd, and picture shows both molds after the cloth was applied to the second half of each:

Attached Thumbnails Click image for larger version

Name:	IMG_5861.JPG
Views:	247
Size:	1.30 MB
ID:	2193198  
Old 01-14-2017, 08:41 PM
  #275  
Iron Dog
Thread Starter
 
Iron Dog's Avatar
 
Join Date: Feb 2009
Location: Sacramento, CA
Posts: 1,347
Likes: 0
Received 3 Likes on 3 Posts
Default

Mold halves popped-off of both the CzechMate and the RareBear plugs; then cleaned-up.

Attached Thumbnails Click image for larger version

Name:	IMG_5904.JPG
Views:	240
Size:	904.8 KB
ID:	2196800   Click image for larger version

Name:	IMG_5906.JPG
Views:	240
Size:	771.9 KB
ID:	2196801   Click image for larger version

Name:	IMG_5907.JPG
Views:	248
Size:	831.7 KB
ID:	2196802   Click image for larger version

Name:	IMG_5908.JPG
Views:	242
Size:	854.0 KB
ID:	2196803  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.