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Sig Skyray Empty Sig Skyray

Post  oldguy on Wed Oct 07, 2020 12:03 am

Does anyone have the dimensions of the sig skyray 35? Would like to try and scratch build one.
I know the elevator is 14 1/2" long.
The wing is 44" long.
Aircraft length 33" long.

Any added dimensions you could add would be great.
Thanks
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Post  pkrankow on Wed Oct 07, 2020 8:40 am

https://sigmfg.com/products/sig-skyray-35-kit

396 sq inches

Since it is cutrrent production getting a copy of the plans without purchasing a kit is difficult. I am sure that SIG acttively protects their intellectual property to some extent, enough that I cannot find plans with a basic internet search, even though I know they have been posted before.

At $70 it is probably worth buying at least once.

Phil
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Post  oldguy on Sat Nov 07, 2020 12:35 am

I purchased a kit. Will be one of the winter projects.
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Post  Ken Cook on Sat Nov 07, 2020 8:43 am

One thing to keep in mind, like the Twister and others, Sig uses Lite ply for the doublers. If you ever purchased it, you would discover that it's half the cost of birch 5 ply. Obviously why Sig chooses to use it.  Even 3 ply is better than Lite ply. My buddy Larry built 2 of them and I suggested to replace the doublers which he didn't. Vibrations rendered the Lite ply plane useless. It doesn't stabilize the nose adequately and the bolts will pull through it as well. The Skyray already in my opinion has beams too short and coupling that with inferior plywood makes twice the issues. I don't like the fact that they chose to use the same plywood for the ribs but I will say it works for that principle aside from the weight penalty they offer. Many offer suggestive ideas on what to do for this and that but in my experience, most kits suffer from the lack of good quality ply. That would be the most important change.
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Post  getback on Sat Nov 07, 2020 2:02 pm

oldguy wrote:I purchased a kit.  Will be one of the winter projects.
Are you going to share Smile
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Post  oldguy on Sat Nov 07, 2020 2:08 pm

getback wrote:
oldguy wrote:I purchased a kit.  Will be one of the winter projects.
 Are you going to share Smile

Right now i'm working on a Super Satan building from a short kit. The other kit i mentioned is the Sig Skyray 35.
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Post  oldguy on Sat Nov 07, 2020 2:14 pm

Ken Cook wrote:One thing to keep in mind, like the Twister and others, Sig uses Lite ply for the doublers. If you ever purchased it, you would discover that it's half the cost of birch 5 ply. Obviously why Sig chooses to use it.  Even 3 ply is better than Lite ply. My buddy Larry built 2 of them and I suggested to replace the doublers which he didn't. Vibrations rendered the Lite ply plane useless. It doesn't stabilize the nose adequately and the bolts will pull through it as well. The Skyray already in my opinion has beams too short and coupling that with inferior plywood makes twice the issues. I don't like the fact that they chose to use the same plywood for the ribs but I will say it works for that principle aside from the weight penalty they offer. Many offer suggestive ideas on what to do for this and that but in my experience, most kits suffer from the lack of good quality ply. That would be the most important change.

I will look at the ply doublers that you mentioned, i also read where some have replaced the ply ribs with balsa. I bought the Skyray kit off ebay For $59.00 total. It was a sealed kit. And the engine beams were two different sizes 1 was 3/8x1/2 and the other was 1/2x1/2 weird. And they do look alittle short, iw ill be replacing them i have some maple 3/8x 1/2.
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Post  Ken Cook on Sun Nov 08, 2020 6:06 am

There's been about 6 of these Skyray planes that I have seen in our club over the past 10 years. Only one had the ply ribs. I don't think that's a huge issue. However, I believe they're die cut therefore some of them might not be exactly the same outline. Personally, I don't like to re engineer a entire kit. I have no issues with simple changes. One thing though you might want to swap is a inboard rib for balsa to exchange the ply version so that you have a solid decent template. My flying buddy Jack who passed away a few years ago had a beautiful flying version. His daughter requested that a few of us come over and take his items. I find that very disturbing, however the outcome of the stuff is usually given away to a non modeler or trash canned. I couldn't locate the plane. His was powered with a FP .25 and it was a real hoot to see. It ripped through the air when leaned up.
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Post  oldguy on Wed Nov 18, 2020 10:48 pm

Ken Cook wrote:          There's been about 6 of these Skyray planes that I have seen in our club over the past 10 years. Only one had the ply ribs. I don't think that's a huge issue. However, I believe they're die cut therefore some of them might not be exactly the same outline. Personally, I don't like to re engineer a entire kit. I have no issues with simple changes. One thing though you might want to swap  is a inboard rib for balsa to exchange the ply version so that you have a solid decent template. My flying buddy Jack who passed away a few years ago had a beautiful flying version. His daughter requested that a few of us come over and take his items. I find that very disturbing, however the outcome of the stuff is usually given away to a non modeler or trash canned. I couldn't locate the plane. His was powered with a FP .25 and it was a real hoot to see. It ripped through the air when leaned up.

Thanks for the post Ken, I think i'm going to build the kit with the ply ribs, but will be tracing all the parts using from the kit, onto balsa for another build later. This one will have an FP .25.
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Post  layback209 on Sun Nov 22, 2020 9:25 pm

Nice choice of plane! I really like building mine. The spars were kinda wonky but lots of weight and patience was able to build them out. I went with a evo .36 but found it very nose heavey, needed about 3ozs to the tail to get the c.g. right. I think the .25 la would be a much better fit as mentioned above from a weight savings perspective.

Here is the color scheme I went with if your looking for some ideas.

Sig Skyray 20200610
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Post  oldguy on Sun Nov 22, 2020 11:59 pm

layback209 wrote:Nice choice of plane! I really like building mine. The spars were kinda wonky but lots of weight and patience was able to build them out.  I went with a evo .36 but found it very nose heavey, needed about 3ozs to the tail to get the c.g. right.  I think the .25 la would be a much better fit as mentioned above from a weight savings perspective.  

Here is the color scheme I went with if your looking for some ideas.

Sig Skyray 20200610

I'm going to setup the SR with the Os fp .25, color scheme, wing will be yellow because that's the color of covering i have on hand at the moment, the rest is yet to be determined.   Yours on the wall looks pretty nice.   It will be a little while before i get into the SR.   I'm building a Super Satan at the moment. Wing will be yellow also for the same reason as the SR it's whats on hand.  With a OS Fp .20.  I think it will be plenty of power. I see you hang yours on the wall like i do. But i still have to find somewhere to fly when summer comes i'm new to Idaho.
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Post  Cribbs74 on Mon Nov 23, 2020 12:09 am

oldguy wrote:
layback209 wrote:Nice choice of plane! I really like building mine. The spars were kinda wonky but lots of weight and patience was able to build them out.  I went with a evo .36 but found it very nose heavey, needed about 3ozs to the tail to get the c.g. right.  I think the .25 la would be a much better fit as mentioned above from a weight savings perspective.  

Here is the color scheme I went with if your looking for some ideas.

Sig Skyray 20200610

I'm going to setup the SR with the Os fp .25, color scheme, wing will be yellow because that's the color of covering i have on hand at the moment, the rest is yet to be determined.   Yours on the wall looks pretty nice.   It will be a little while before i get into the SR.   I'm building a Super Satan at the moment. Wing will be yellow also for the same reason as the SR it's whats on hand.  With a OS Fp .20.  I think it will be plenty of power. I see you hang yours on the wall like i do.   But i still have to find somewhere to fly when summer comes i'm new to Idaho.

You really should do a build thread on that Super Satan. I have plans and it’s on my bucket list.
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Post  oldguy on Sun Jan 03, 2021 8:08 pm

Ken Cook wrote:One thing to keep in mind, like the Twister and others, Sig uses Lite ply for the doublers. If you ever purchased it, you would discover that it's half the cost of birch 5 ply. Obviously why Sig chooses to use it.  Even 3 ply is better than Lite ply. My buddy Larry built 2 of them and I suggested to replace the doublers which he didn't. Vibrations rendered the Lite ply plane useless. It doesn't stabilize the nose adequately and the bolts will pull through it as well. The Skyray already in my opinion has beams too short and coupling that with inferior plywood makes twice the issues. I don't like the fact that they chose to use the same plywood for the ribs but I will say it works for that principle aside from the weight penalty they offer. Many offer suggestive ideas on what to do for this and that but in my experience, most kits suffer from the lack of good quality ply. That would be the most important change.

Besides building the Super Satan, I have been gathering balsa , and i have now traced and cut all parts of the Sky Ray, I'm going to be building my first Sky ray with all the traced out balsa, using all balsa ribs, no short ribs. Oh, still need to put to together LE, will use 2 1/4" planks glued together for the 1/2" LE. It's what i have done for the fuselage. i have found it to be stronger when scratch building a 1/2" profile fuselage with two 1/4" pieces glued together. I will be using 1/8" ply for the doublers, it's what i have on hand and it shouldn't be a weight problem since i'm substituting balsa ribs for ply ribs.
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