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Modified SIG Twister (formerly Sister Twister)

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Re: Modified SIG Twister (formerly Sister Twister)

Post  pkrankow on Thu Apr 23, 2015 5:21 pm

Cribbs74 wrote:Thanks Phil,

Wish I had this info a day ago. Thing is the slot is cut into the top of the plug and not the bottom. So it has no effect on anything when they are beiing screwed into the bearers.

The bottom of the plug is tapered so I don't think I was installing them upside down.

Maybe there are enough different brands that we are both right, but with different brands?  I don't know on this one.

Phil
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Re: Modified SIG Twister (formerly Sister Twister)

Post  pkrankow on Thu Apr 23, 2015 5:24 pm

Ken Cook wrote:I have used these in the past but I can't say I'm a big fan of them. In order to install them  you really are sacrificing a large hole through a 3/8" x 1/2" beam. Not only can this produce vibration issues but it can also lead to the mounts breaking in case of a mishap. Mishaps don't need to be accidental control inputs. A plane like the Twister can get real floaty when the engine quits especially if your on the windy side. A nose over like that can break your engine off if the mounts give way due to removing so much material. Just my opinion. Ken

Ron a #16 drill is probably a better bet due to it being slightly larger by about .005" over a 11/64" drill bit.

In proper maple beams I agree with you, white oak too. The stuff ARF's are made from? Not so much. Prevention of wood crushing with an insert is important.

Phil
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Re: Modified SIG Twister (formerly Sister Twister)

Post  Cribbs74 on Thu Apr 23, 2015 5:50 pm

Phil,

These are the ones I bought, they are made by great planes. I pulled up the bio for them and it reads as follows:



PICTURED IS A PACKAGE OF 4, 4-40 THREADED BRASS INSERTS THAT ARE DESIGNED FOR 3/8" THICK OR GREATER WOOD OR FIBERFILLED MATERIAL SUCH AS PRESSBOARD OR FIBERFILLED PLASTIC, YOU DRILL A 1/4" HOLE WHERE YOU WISH TO USE A 4-40 MACHINE BOLT AND THEN APPLY SOME EPOXY TO THE INSERT AND THREAD IT INTO YOUR MATERIAL TILL IT IS FLUSH WITH THE SURFACE. THE INSERT IS MADE WITH A SCREWDRIVER SLOT FOR EASE OF INSTALLATION. EXCELLENT INSTRUCTIONS ARE INCLUDED IN THE PACKAGE.


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Re: Modified SIG Twister (formerly Sister Twister)

Post  pkrankow on Thu Apr 23, 2015 6:11 pm

I bought these
http://www.microfasteners.com/nuts-brass-threaded-inserts-for-wood.html
and the bag reads


Phil
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Re: Modified SIG Twister (formerly Sister Twister)

Post  pkrankow on Thu Apr 23, 2015 6:16 pm

I'm not saying you are wrong, just that the products we bought have different instructions.

Phil
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Re: Modified SIG Twister (formerly Sister Twister)

Post  Cribbs74 on Thu Apr 23, 2015 7:19 pm

Well, looking at that I could very well be wrong. I'll definitely be using jam nuts next go around.

Thanks Phil, I appreciate it.
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Re: Modified SIG Twister (formerly Sister Twister)

Post  TDbandit on Thu Apr 23, 2015 9:40 pm

+1 on the allen screw with jam nut on those inserts, those can be pesky.
If you use an allen wrench, try a T-handle they are usually better quality and fit better and don't twist as much and make it loads easier to thread those inserts in with. And BTW nice twister build, makes me want to get started on mine! (Bandit)
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Re: Modified SIG Twister (formerly Sister Twister)

Post  Cribbs74 on Fri Apr 24, 2015 7:15 pm

Thanks Bandit,

I tried hard to make it not look like a Twister, I am excited to get working on it again.
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Re: Modified SIG Twister (formerly Sister Twister)

Post  Cribbs74 on Thu Apr 30, 2015 11:36 pm

Block tips!!!

This is my first attempt at this, I do like the way they look on other folks planes so I decided to try my hand at them this go around.

Basically I stacked 1/2" balsa sheet and glued/clamped them together with Ambroid. After that I traced the rib outline and cut that out of the block using the scroll saw. Once that was done I traced the tip shape on the top side and again cut that out using the scroll saw.

This left me with a rough shaped block which I slowly rounded out using the belt sander. I moved onto 100 grit and hand sanded the rough final shape followed by 150 grit to smooth.

I am still not near done with them, have lots of final sanding to do to blend it into the wing. The Dremel makes quick work of hollowing them out and they are becoming very light. It doesn't take long as what you see in the pics below is about 2hrs of work, started last night and sanded to shape tonight.











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Re: Modified SIG Twister (formerly Sister Twister)

Post  getback on Fri May 01, 2015 8:43 am

Ron The Tip Blocks look good , I like the look of them myself nice and solid , Did you cut the rudder down or does it just seem small Huh... Eric
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Re: Modified SIG Twister (formerly Sister Twister)

Post  Cribbs74 on Fri May 01, 2015 8:57 am

Good eye Eric,

Yes, I went to sand the original one that I made for it and it exploded in the disc sander. I whipped another one up shortly afterwards.

It does look small, but smaller was what I was going for. Once I get everything mocked up I will see if it looks out of place. If it does then I will create another.

Ron



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Re: Modified SIG Twister (formerly Sister Twister)

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