~~SIG Brotherhood ~~
01-26-2018, 08:58 AM
#3052
I would build it per plan up to where you want the section to end, then take that rib and make two out of plywood, use a tube and sleeve that fits that rib and a dowel pin at the rear to align them, and finish building the wing per plan so the length remains the same. Do the same for the other wing, then instead of following plan for the center where the wings would normally join, make a spar section that joins the two panels at least two ribs out on both and epoxy the center together. As for joining the outer panels, you will need to come up with that on your own since I don't have plans that show the wing. What I have done in the past is to use a 3/16 - 1/4" plywood plate that is epoxied on either the wing panel, or center section that slides into the wing and secure it with a T-nut and bolt or two.
On my B-25 I have a setup like this, the aluminum tube is glued into the outer panel, the plywood plate is under it on the outer panel, and the T-nuts are in a plate above the tube so the bolts go in from the bottom, through hardwood blocks under the tube in the CS, through the tube and into the T-nuts. Secures the wing tightly and only shows the small holes underneath where the bolts go in, the heads flush with the surface.
On my B-25 I have a setup like this, the aluminum tube is glued into the outer panel, the plywood plate is under it on the outer panel, and the T-nuts are in a plate above the tube so the bolts go in from the bottom, through hardwood blocks under the tube in the CS, through the tube and into the T-nuts. Secures the wing tightly and only shows the small holes underneath where the bolts go in, the heads flush with the surface.
I know you have other topics you guys are sharing, I'll try not to interrupt.
I'll post photos as I go. Thank you for your help, it's greatly appreciated any other advise would also be appreciated!
01-26-2018, 11:16 AM
#3053
Thread Starter
01-26-2018, 11:17 AM
#3054
Thread Starter
Thank you acdii for all the info you gave me, now I know where to start. In the photo, is that the cub or your B-25? And the hole in the plywood is where the bolt goes through to secure the wing? I'm headed to the hobby shop today to pick up 1/16 ply for laminating to the existing ribs or should I go 1/8 and the hardware store for 1/2 aluminum tubing/insert for the spar area and probably 3/8 tubing for the aft. I'm planning on making the wing a 3 piece so the center section will remain bolted down.
I know you have other topics you guys are sharing, I'll try not to interrupt.
I'll post photos as I go. Thank you for your help, it's greatly appreciated any other advise would also be appreciated!
I know you have other topics you guys are sharing, I'll try not to interrupt.
I'll post photos as I go. Thank you for your help, it's greatly appreciated any other advise would also be appreciated!
01-27-2018, 07:49 AM
#3056
Thread Starter
What is that, Walnut? The weak point I would say is the joint between the ribs and the spar, so get some tri stock glued in to marry the joints together. From what I saw of the damage in pictures, that appears to be where they failed. Do you still have the carnage to look at? I still need to find some carbon fiber(actually need to find the MONEY to get some carbon fiber) and make a new fin and stab with foam and balsa and see if I can shave off a few pounds. Pretty weird that we have to shave Pounds and not Ounces.
Looks like you got a good glue joint too, did you use West Systems for the spar? Fingers crossed this one is stronger.
Looks like you got a good glue joint too, did you use West Systems for the spar? Fingers crossed this one is stronger.
01-27-2018, 07:30 PM
#3057
Acdii
yes that is walnut, its all i had. So I increased the top and bottom spar caps to 3/4” wide and 1/4” thick One piece, also laid in carbon fiber between the spar and cap. I used bob smith epoxy and i was not frugal. So hopefully i made a I beam spar that is strong enough don’t need struts. How ever the stuts will be used anyway
yes that is walnut, its all i had. So I increased the top and bottom spar caps to 3/4” wide and 1/4” thick One piece, also laid in carbon fiber between the spar and cap. I used bob smith epoxy and i was not frugal. So hopefully i made a I beam spar that is strong enough don’t need struts. How ever the stuts will be used anyway
01-28-2018, 08:25 AM
#3058
Thread Starter
Looks like it will work well. After seeing how much the wing flaps in flight, I don't think you could make the spar strong enough without some form of carbon fiber or aluminum to fly without struts. That is a lot of stress they are under.
02-01-2018, 12:09 PM
#3061
Capt, I probably would have laminated in a piece of at least 1/16 thick 6061 aluminum to that main spar. I know it would have added a bit of weight but I could almost bet the spar wouldn't fail under load
02-01-2018, 04:12 PM
#3063
I thought about that too but the one piece caps should make a big difference and I don’t plan to fly with out struts.
02-01-2018, 10:06 PM
#3064
Great pics!!!!!!!!!!!!!!!!!!!!
02-04-2018, 10:48 AM
#3065
OK! Major CORRECTION to the SIG History website: ever since my original e-mails back & forth to the late/great Mike Gretz there's been an error in the listings. He had the original RC Citabria (symmetrical wing) listed as RC15 and the Baron's Buggy listed as RC8 - - they should be reversed. Corrected the website to show RC8 as the Citabria (symmetrical wing from 1968) and RC15 to be the Baron's Buggy. The modern RC30 Citabria was a rework to make it flat-wing, done in 1972.
Also, found an actual photo (set) of the SIGFF16 ABC Scrambler, which is now on the website.
Can't believe I've had those 2 planes flip-flopped since 2005 and never caught it. Must be old age or sumpn'.
Also, found an actual photo (set) of the SIGFF16 ABC Scrambler, which is now on the website.
Can't believe I've had those 2 planes flip-flopped since 2005 and never caught it. Must be old age or sumpn'.
02-04-2018, 12:04 PM
#3067
They show up on the bay occasionally. I've found SIGHS131B - Hazel Sig Pilot - 1/4 - 1/3 Scale, also 132 & 133.
02-05-2018, 12:06 PM
#3068
There's a guy in LA that presently does C/L kits and he's looking at branching into RC more than he already is. If kits were to come available, who would like to see which out-of-production SIG kit re-introduced?
02-05-2018, 12:16 PM
#3069
Join Date: Nov 2014
Location: Machesney Park, IL
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Dave,
I would like to see the Komander MKII and the Liberty Sport in that order make a comeback. Both are really fun to fly planes. I don't think either one is difficult to build either. Put a nice 4 stroke on a biplane and you just can't ask for a sweeter sound in flight.
02-05-2018, 12:24 PM
#3070
Thread Starter
I would like a Liberty Sport, but an updated one for the newer engines and E-power. Both gas and glow 4 strokes. Looking at the plans, looks like there could be a few improvements in the way it is built based on the newer SIG kits when they went to laser cut.
02-06-2018, 04:09 AM
#3072
Well, boy this rascal is some work not because its a kit but because it so big. Finally got wing mostly assembled and tail services all laminated together. Tite bound is really good for covering large area’s but you have to lay up and the let dry.
I just don’t know if i’m putting the 85 cc back on this one. The DJ 125 sure looks good and besides I need the nose weight and a little more power would be good. Tonight I will do a dry fit and post some pics.
I just don’t know if i’m putting the 85 cc back on this one. The DJ 125 sure looks good and besides I need the nose weight and a little more power would be good. Tonight I will do a dry fit and post some pics.
02-07-2018, 07:55 AM
#3075
When does he plan on starting production? Here is a link to a site with the most comprehensive list of kits made by SIG along with some history. It's very good, he even has some plan sheets and other documentation!
https://wanderings-ds.jimdo.com/
Last edited by FlyerInOKC; 02-07-2018 at 08:02 AM.