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  #11  
Old 03-24-2019, 03:28 AM
John Brohm's Avatar
John Brohm John Brohm is offline
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Join Date: Feb 2005
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Sorry to hear about your paint lift. A minor setback; the Soyuz seems to be coming along quite nicely!
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  #12  
Old 03-24-2019, 09:48 AM
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It's going to look great. I'm curious about the all up flight weight. Do you have an estimate?
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  #13  
Old 03-24-2019, 03:26 PM
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I did a preliminary assembly and so far the weight is up to 34 oz. sans motor and recovery.
My trusty estes ohaus scale shows 22 oz. for the booster and 12 oz. for the top half.
I've been concerned about weight since the start and have removed every bit I could.

Currently my heaviest model is an LOC inspired Maxi Alpha that tips out at 24 oz. flight ready and goes so high on an F20 that you lose sight of it. I really want to fly the Soyuz safely and I would be happy if it went a few hundred feet, but I'm limited to unlicensed propulsion choices.
All my bigger stuff runs from a 6ft. x 1/4" stainless rod.

If anyone has flown a model in the 40oz. range with less than H power, I'd appreciate some pointers.
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  #14  
Old 03-31-2019, 05:42 PM
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I spent the better part of the afternoon trying to balance the Soyuz. I found an image of the RockSim file for the Norris version. It gives dimensions for CG and CP. My model is about 25% larger, so I scaled up the dimensions. Based on this info, the CP appears to be about one-third of the way down the boosters.
Rocksim shows the CG at 1 caliber. I went with a 2 caliber placement which put mine at 4" ahead. Only 1.25 oz was needed to achieve balance, which didn't seem like enough. I wanted to try it with an empty motor casing installed, but didn't have one. Does anyone know the weight of a spent SU 29mm case? I could add this weight aft and rebalance again.
I hope I'm in the ballpark with the CG/CP. My model doesn't have the transition on the main tube and the boosters have more air gap than a scale version.
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  #15  
Old 03-31-2019, 06:35 PM
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ghrocketman ghrocketman is online now
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A G80 with the short delay will fly that fine.
Not very high, but it will do it safely.
Years ago Estes used to say the D12-3 would lift 14oz
Your rocket only weighs 2.5 lbs.
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  #16  
Old 04-24-2019, 03:13 PM
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I finally got all that wrinkled chrome paint off the nozzles and applied a new basecoat.
A noseblock was made from 3/4" plywood and installed under the capsule. A 1/4" bolt holds 2 oz. of washers to the underside. I am now satisfied with the balance, having found a spent 29mm motor case to use in recalibration. A coat of white was applied to the top. I now have to make the decals and install the shock cord. I am glad to be nearing the finish line and look forward to the first flight.
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  #17  
Old 05-18-2019, 03:20 PM
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The nozzle/fin units are now finished. Although I like the look of chrome paint, it's use has been problematic. These were supposed to be a focal point of the model but now I just hope they blend in because I'm fed up with reworking the finish.
I cut some fiberglass window screen and used it to add detail to the top section. I thought about using metal screen but it fell apart when reduced to 1" x 1".

The artwork for the stickers is done and I have all the pieces for the recovery.
I need to come up with a launch lug system that I can attach with screws. I have a few ideas to try and will select the best one. So far this model has relied exclusively on mechanical fasteners as I have not found a glue that exhibits adequate bond strength for this plastic, especially for dissimilar materials.
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  #18  
Old 05-26-2019, 07:31 PM
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Some final assembly photos. Should have decals later in the week. Launch lugs in progress.
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  #19  
Old 05-26-2019, 07:49 PM
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Looking really good!
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  #20  
Old 05-28-2019, 04:13 PM
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Default Soyuz Decals

I'd like to thank Erik Goodman for sharing the decals he created for his Soyuz model. They're too large to upload to the forum so I'm hosting them on my site. They print out at 11x17.

www.oldrocketplans.com/decals/Soyuz_Decals.jpg
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