NORSEMAN Unionville wing support? - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-09-2019, 07:48 AM   #11
cf100
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Re: NORSEMAN Unionville wing support?


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Sorry to hear about your Norseman but thank-you for posting the information as I have a Norseman waiting to be covered this winter.

A couple of weeks ago I did a high speed pass with with my Eflite 46 powered GP Cub 80", the guy spotting for me said my struts were just bounding up and down like crazy on the high speed pass.

That being said, and your posted information, I will go back and add jury struts to the Cub and the Norseman,
how to that attach to the top of the wing so that the wing is easy to remove needs to be worked out.

a bit of jury strut info at http://eaaforums.org/showthread.php?7175-Jury-Struts

Save the pieces, a winter rebuild will be ok.

cheers - ken
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Old 07-09-2019, 08:35 AM   #12
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Re: NORSEMAN Unionville wing support?

Jury struts: Great now the baby has a name. Here is what Wikipedia says about them, among a lot of other things:

Jury struts
Complex jury struts on a Fleet Canuck

A lift strut can be so long and thin that it bends too easily. Jury struts are small subsidiary struts used to stiffen it.[18]

Problems which jury struts prevent include resonant vibration and buckling under compressive loads.

Jury struts come in many configurations. On monoplanes with one main strut, there may be just a single jury strut connecting the main strut to an intermediate point on the wing. A braced monoplane with 'V' struts such as the Fleet Canuck may have a complicated assembly of jury struts.


The manual for the Unionville Norseman simply calls for holes in the wing to stick them in which is why I didn't take them serious enough to add them. My 83" Cub has them screwed to the wing the same way the Struts are screwed on at the ends.
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Old 07-09-2019, 09:33 AM   #13
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Re: NORSEMAN Unionville wing support?

Jury struts. Interesting. This discussion has made me very concerned about my wing struts.

Like others here, I also have a 84 in Norsemen. Originally it was powered by a 90 four stroke, but I have since convert it to Electric. Now here's what's interesting and is making me think. The original model was quite light, having a 90fourstroke in the nose and while on floats, the floats were monocoat covered.

after years of use exclusively on water, The monocoat on the floats would leak at the seams and get very heavy with water. I recovered the floats with fiberglass cloth and resin. Within that same year I also changed it from Nitro to Electric. The net result is the plane is a lot heavier now than it used to be. While the plane does have jury struts that are secured to the wing with screws, I'm concerned about the strength of the struts now having to hold up a much heavier model. I would definitely go with a more solid strut as suggested earlier, and I was thinking maybe some carbon or fiberglass Arrow shafts?
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Old 07-09-2019, 11:16 AM   #14
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Re: NORSEMAN Unionville wing support?

Hi Max, I was hoping to hear from you here.
At least you have less vibration with the electric motor as long as the prop is balanced. I don't see the struts break under load until you're flying inverted at which point even the Jurys should probably be more than just a 1/16 wire which the kit supplied and the manual calls for. I've got everything rebuilt now and will see what I can find at Pinnacle Hobby to make better struts and Jurys with.
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Old 07-09-2019, 11:41 AM   #15
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Re: NORSEMAN Unionville wing support?

Jury struts are a pain but a requirement on a high wing loading aircraft. Here are some photos of jury struts on a 1/3 scale clipped wing cub that I built. They fold and the main struts fold. Installing the wings requires 2 bolts from the cabin into the wing root and 4 clevis pins, 2 in top of the jury and 2 in the main. Minimal amount of time. For the main struts best wood is Sitka spruce or use the aluminum extruded. Also where the jury attaches to the main do not drill the main but use a clamp. Drilling the attach point will weaken the main.
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Old 07-11-2019, 09:15 AM   #16
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Re: NORSEMAN Unionville wing support?

Make sure that the stock for the struts is straight grain. Just round the corners, do not streamline it.
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Old 07-11-2019, 06:54 PM   #17
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Re: NORSEMAN Unionville wing support?

Question , why not streamline the struts? As long as the grain run out is less than 1 in 15 or about 4 degrees and they are properly sized streamlining should not significantly weaken them.
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Old 07-15-2019, 01:18 PM   #18
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Re: NORSEMAN Unionville wing support?

'Had my maiden flight today after doing the rebuild and adding new 1/4"struts plus Jury struts made from 3/32"piano wire. As soon as the Juries went on the whole strut set up became one solid unit without any kind of visible vibration. A couple of loops and inverted runs and all was fine.
Now I'll be changing back to the floats, put the cowl back on, and head for the water. The goal is 15 minute changeover time.
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Old 07-15-2019, 05:07 PM   #19
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Re: NORSEMAN Unionville wing support?

Quote:
Originally Posted by DaveV View Post
'Had my maiden flight today after doing the rebuild and adding new 1/4"struts plus Jury struts made from 3/32"piano wire. As soon as the Juries went on the whole strut set up became one solid unit without any kind of visible vibration. A couple of loops and inverted runs and all was fine.
Now I'll be changing back to the floats, put the cowl back on, and head for the water. The goal is 15 minute changeover time.
Nice plane, I plan built mine from sticks, I made my struts from extruded aluminum from K & S Engineering. I just have a couple of flights on mine, struts seem real solid, no vibration. Mine is patterned after CF-SAM, I running a 21 cc RCGF twin, smoothest running plane I have. I have to try and post pictures.
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Old 07-16-2019, 09:35 AM   #20
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Re: NORSEMAN Unionville wing support?

Nice rebuild and congrats on the successful flight.

Can you post closeups of the strut ends and attach points?
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