Sig Kadet MkII build
11-08-2015, 12:00 PM
#76
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Never mind, got it from your web site. Really good work there, bud; fascinating stuff. Now I have plenty read while glue is drying, etc.
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Last edited by LSP972; 11-08-2015 at 12:16 PM.
11-08-2015, 02:33 PM
#77
Hey LSP972 - glad you found it on the website - - thought I'd included pdf-1 too, maybe not. Yeah, that new website's a HUGE improvement over my original pages - many more planes found, and I think all of them have the basic info included now too. It's been a lot of fun building/re-building the pages. One day I might actually get lucky (it would be VERY lucky) and find RC10 & 11 too. Shoot, I consider myself lucky that I got any one of the 3 variants. The older SIG guys mentioned that the RC10,11,12 SIMCO series didn't sell real well, not a whole lot were made I guess.
11-08-2015, 11:54 PM
#78
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Another small update... I installed the blind nuts into the firewall, then mounted the engine at 3 1/2" to spinner backplate* using double sided tape to temporarily hold it in place while I marked out the hole locations, then removed the tape and drilled out the engine mounting holes for the 4-40 bolts. * the DuBro spinner is one of those with a recessed backplate so I have to remember to only use similar spinners in the future for this plane.
I was apprehensive about the blind nuts seating properly in the plywood but using the screws through the engine mounts and nose-gear mount worked perfectly. I applied Vaseline to the threads using a Q-tip with most of the cotton cut off one end (it was a bit of a squeeze for the smaller blind nuts). And I also applied Vaseline to the bolts prior to snugging everything up. Once the epoxy set, I cleaned the threads using isopropyl alcohol as I intend to use blue Loctite prior to final assembly.
Just need to Dremel off the excess bolt lengths behind the firewall and I can start on the rest of the fuselage!
I was apprehensive about the blind nuts seating properly in the plywood but using the screws through the engine mounts and nose-gear mount worked perfectly. I applied Vaseline to the threads using a Q-tip with most of the cotton cut off one end (it was a bit of a squeeze for the smaller blind nuts). And I also applied Vaseline to the bolts prior to snugging everything up. Once the epoxy set, I cleaned the threads using isopropyl alcohol as I intend to use blue Loctite prior to final assembly.
Just need to Dremel off the excess bolt lengths behind the firewall and I can start on the rest of the fuselage!
Last edited by KenChoo; 11-09-2015 at 12:05 AM.
11-09-2015, 01:06 AM
#79
I would hold off on cutting the screws. You actually need to coat the firewall with something to seal it. If it's not sealed, the firewall will quickly get fuel soaked, making it unusable. If the screws are an issue, get shorter ones so you don't ruin the threads on either the firewall or the screws themselves. I would probably replace them anyway with socket head screws. It's much easier to remove a stripped socket head than it is to remove a stripped slotted screw. Just a thought from someone that runs "big blocks" in boats
11-09-2015, 08:53 AM
#80
On the firewall I would suggest adding a piece of wood with a slightly oversized hole for each screw and glue it over the blind/T-nuts. I have always epoxied them in but still have seen the come loose. It's always the one that requires surgery on the airframe to fix too! Sandwiching the T-nuts between 2 pieces of wood is worthy insurance.
11-09-2015, 02:15 PM
#81
I would hold off on cutting the screws. You actually need to coat the firewall with something to seal it. If it's not sealed, the firewall will quickly get fuel soaked, making it unusable. If the screws are an issue, get shorter ones so you don't ruin the threads on either the firewall or the screws themselves. I would probably replace them anyway with socket head screws. It's much easier to remove a stripped socket head than it is to remove a stripped slotted screw. Just a thought from someone that runs "big blocks" in boats
Last edited by TomCrump; 11-13-2015 at 04:14 PM.
11-09-2015, 09:36 PM
#85
Tower sells them, as does Tacoma Screw
http://www.tacomascrew.com/Products/Sockets#!Sockets
As for sandwiching the blind nuts, unless you get stainless ones, they do corrode. When they do, being sandwiched in makes them almost impossible to change without removing the firewall. It's not that difficult to replace a blind nut if it comes out, using a piece of wire and a crimp on fishing weight to pull it into the hole. Another option is threaded inserts:
http://www3.towerhobbies.com/cgi-bin...Fb%3Esert+4-40
Just drill out the hole to the required size and screw it in with epoxy, you're done that fast
http://www.tacomascrew.com/Products/Sockets#!Sockets
As for sandwiching the blind nuts, unless you get stainless ones, they do corrode. When they do, being sandwiched in makes them almost impossible to change without removing the firewall. It's not that difficult to replace a blind nut if it comes out, using a piece of wire and a crimp on fishing weight to pull it into the hole. Another option is threaded inserts:
http://www3.towerhobbies.com/cgi-bin...Fb%3Esert+4-40
Just drill out the hole to the required size and screw it in with epoxy, you're done that fast
Last edited by Hydro Junkie; 11-09-2015 at 09:45 PM.
11-10-2015, 07:46 AM
#86
Mike
11-11-2015, 06:46 PM
#87
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Construction continues slowly...fuse is being worked on...welcome back, little red pins! Just gotten as far as epoxying the plywood fuselage doublers (FN) in the forward fuselage.
11-13-2015, 12:14 PM
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I should have said this earlier, but thank you to everyone who gave me tips on where to buy hardware. I haven't checked those sources out yet, but it's good to know...I feel sure I'll get to use that knowledge in the future.
Another mini-update to round off the week: I've finished adding all the cabin-doublers and fuse braces to the point where I can cut the fuse sides out of the sheet it comes in! I'm looking forward to doing so and getting a shape to the fuselage next week. Onwards!
Have a good weekend, everyone!
Another mini-update to round off the week: I've finished adding all the cabin-doublers and fuse braces to the point where I can cut the fuse sides out of the sheet it comes in! I'm looking forward to doing so and getting a shape to the fuselage next week. Onwards!
Have a good weekend, everyone!
11-16-2015, 06:12 PM
#90
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Thanks Mike,
Well, got more done today. I cut the fuse sides out of their sheets and sanded them to match. I started with the top cabin area, then the wing saddle, then back to the tail on the top. Then I sanded the bottom. After that I added the two formers (F3 and F4), and made use of some large hard balsa stick (I bought a bundle for the servo rails) to pin to the plans and align the fuse sides. Finally this evening pulled the tail together. It's getting its shape! I made sure as I got the tail together that they lined up with the plans (i.e. were straight) and also used two long straight sticks to align the horizontal stab and wing areas, making sure they were parallel. I'll check the incidences at a later stage.
I'm starting to rush again so I gotta slow myself down...made a couple of small silly mistakes today.
Well, got more done today. I cut the fuse sides out of their sheets and sanded them to match. I started with the top cabin area, then the wing saddle, then back to the tail on the top. Then I sanded the bottom. After that I added the two formers (F3 and F4), and made use of some large hard balsa stick (I bought a bundle for the servo rails) to pin to the plans and align the fuse sides. Finally this evening pulled the tail together. It's getting its shape! I made sure as I got the tail together that they lined up with the plans (i.e. were straight) and also used two long straight sticks to align the horizontal stab and wing areas, making sure they were parallel. I'll check the incidences at a later stage.
I'm starting to rush again so I gotta slow myself down...made a couple of small silly mistakes today.
Last edited by KenChoo; 11-16-2015 at 06:14 PM.
11-17-2015, 05:00 AM
#94
The nice thing is that our models are made from wood. Ain't nothin' that we can't fix. LOL
I'm concerned about your comment on balsa servo rails, though. I prefer hardwood or ply.
11-17-2015, 06:11 AM
#95
Watching you build the MKII I realize it is more closely related to the Kadet 40 then the Senior and Senorita Kadets. Yon is right we build with wood so there isn't much we can't fix. I don't like balsa for servo rails either unless you laminate it with a piece of ply to keep the screws from pulling out. Wood screws and balsa are a bad combination if there is any stress in the mixture.
11-17-2015, 06:33 AM
#96
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Hi guys,
My apologies, I wrote in haste...the sticks I bought for the rails are not balsa but a hardwood (basswood maybe?). Thank you though for catching that...if it had been balsa I could have been saved a major mistake. I'm glad some people are paying more attention than me!
I've rechecked the alignment this morning and am not 100% happy with it so I sawed off the tail block and 3/32" scrap to redo this. I'd like to make sure it is 100% straight.
Cheers
My apologies, I wrote in haste...the sticks I bought for the rails are not balsa but a hardwood (basswood maybe?). Thank you though for catching that...if it had been balsa I could have been saved a major mistake. I'm glad some people are paying more attention than me!
I've rechecked the alignment this morning and am not 100% happy with it so I sawed off the tail block and 3/32" scrap to redo this. I'd like to make sure it is 100% straight.
Cheers
Last edited by KenChoo; 11-17-2015 at 08:20 AM.
11-19-2015, 06:18 PM
#98
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More progress made...now that the tail end of the fuse is joined, I've added the top cross braces and the fill-in sheet to take the tab on the fin. After that I glued on the firewall (milestone!) and added the triangle stock reinforcement. Next came the formers and stringers that'll lend more shape to the nose, which also had to be cut to clear the fuel tank (just the rear former, F2). Looks like I'll have to think about ordering my covering soon.
It's thrilling to see the fuse taking shape...building is very rewarding...different from flying, but no less enjoyable.
It's thrilling to see the fuse taking shape...building is very rewarding...different from flying, but no less enjoyable.
Last edited by KenChoo; 11-19-2015 at 06:43 PM.
11-20-2015, 07:03 AM
#100
OHO! Ain't that the truth!!!!!!!!!!!!!!!!!
