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Old Mar 12, 2013, 07:06 PM
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eye4wings's Avatar
Ware, herts. U.K.
Joined Sep 2008
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Good grief Doug! - This is turning into a tale of woe of epic proportions!

Those weren't even cheap servos...

And another suggestion re the springs -
How about slotting a washer between the last turn of the spring and inserting a bolt down the inside to screw into a captive nut to give you tension adjustment?
If nothing else it would save a few additional purchases of springs.

Also, being a dyed-in-the-wool cheapskate, I sometimes over-pull springs so that they become longer and offer less tension at the same length they were before.

Robin
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Old Mar 13, 2013, 03:56 AM
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Doug Bartley's Avatar
Canada, ON, Owen Sound
Joined Oct 2008
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Hi Robin: I now have both LG servos installed with the heavier springs. Even these 27kg servos are incapable of lifting the lg from down position. Something else is preventing the movement, but I'm darned if I have an answer.
Turn the wing upright, and everything is fine, works perfect, just as I found out earlier, and the new servos don't seem to even break a sweat. As before, there is now no load on the servo up or down, and it will not fold whether the servo is powered or not with the spring attached.
I have to be able to duplicate this on all 3 planes, so need standard parts.
Your bolt adjustment may work, I'll look into it, not much room to work with.
Thanks for the idea. Doug B
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Old Mar 13, 2013, 06:30 AM
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eye4wings's Avatar
Ware, herts. U.K.
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Doug, if you are trying to get the gear to work upside-down I fear you are asking too much! You would do better to omit the springs altogether because if they are adjusted to balance the weight of the gear when up the right way they are exerting a force upwards roughly equivalent to the weight of the gear downwards and once you turn the model over you have in effect doubled the weight your servo has to lift.

If it works perfectly the normal way up that's job done!
The wheels come down and lock...
They go up and lock...
Do no more...
It's cool...
Don't try and gild the lily.
Step away from the model...

Or do we have to send in the men in white coats?...
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Old Mar 13, 2013, 01:15 PM
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Doug Bartley's Avatar
Canada, ON, Owen Sound
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Hey Robin: It is odd how a 10kg servo first used for testing, opens and closes the LG upsidedown without issue without the spring, yet a the 27kg can't do it with the spring attached.
But you are right, it does work perfectly when right side up! Iam done!
Now on the servo doors, another joy. The new Turnigy 380mg will have plenty of power. I didn't realize they are actually Bluebird servos. Again with the plastic cases. I had to order 2-56 allthread rod for this, it should be here this week, I hope. The custom arms are done, waiting. Doug B
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Old Mar 17, 2013, 12:59 PM
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Owen Sound, Ontario
Joined Jan 2006
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progress!

Spinner #1 has come out of the mold! Here are a couple of shots of it taped in place against the cowl front.

Needs another layer or two of glass inside to get the fit right with the backplate. The mold is pretty good. There are a few pin holes I will fill so release will be easier.

I am a happy camper!

Paul
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Old Mar 17, 2013, 02:46 PM
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Hi Paul, it looks like you nailed the OD! A couple of layer around the backplate area for a snug fit , and all set.
Have you weighed this spinner per chance? It looks nice and light! Doug B
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Old Mar 17, 2013, 08:16 PM
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Owen Sound, Ontario
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spinner

Added several layers of cloth and the backplate now fits just right.
Spinner weight is 1.5 ounces. Very strong.
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Old Mar 17, 2013, 09:34 PM
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1.5 ozs is wonderful!!! Nice job!!! Really looking forward to seeing them. Thats lighter than expected, excellent. Only 5 more to go, hehe.
I reassembled the plane just to see it together so I wouldn't forget what its supposed to look like. Those massive spinners will make the look.
I'm pondering the nacelle doors while I wait for 2-56 rod, trying to decide if I should go servos on the doors or some mechanical lever sytem. Mechanical would require sliders either on the retract arms or doors to keep the LG from getting tangled up, along with some really light 2-3" springs to maintain tension. More thought is required. hehe. Doug B
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Old Mar 18, 2013, 10:24 AM
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spinners

I am pleased with the weight. Our spinners and backplates will be less than 1/2 the weight of glow versions.

Once the mold is cleaned up I will go into production on the remaining 5!

Paul
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Old Mar 18, 2013, 11:33 AM
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eflightray's Avatar
South Wales U.K.
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Nice going on the spinner. I used a commercial 4" spinner on my Spitfire, 4.25oz weight, just the back plate is 1.75oz. But at least it helps with the CG

I assume your glass one are about that diameter.
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Old Mar 18, 2013, 12:31 PM
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Quote:
Originally Posted by Paulofthenorth View Post
I am pleased with the weight. Our spinners and backplates will be less than 1/2 the weight of glow versions.

Once the mold is cleaned up I will go into production on the remaining 5!

Paul
Thats uper Paul, the lighter spinner/ ackplate combo will be easier to balance and reduce prop shaft strain. Good job. Doug B
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Old Mar 18, 2013, 12:47 PM
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Quote:
Originally Posted by eflightray View Post
Nice going on the spinner. I used a commercial 4" spinner on my Spitfire, 4.25oz weight, just the back plate is 1.75oz. But at least it helps with the CG

I assume your glass one are about that diameter.
Our spinners are 4.125", backplate od is 4.0625" As my Mossy sits (without spinners and still requiring nacelle door servos, it is noticably nose heavy. In this case the light spinner/ backplate will help with the CG. I can attain plan CG easily now with the main battery. Very happy with the spinner weight. Doug B
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Old Mar 25, 2013, 08:56 AM
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Spinners

Spinner #2 is out of the mold. I did some improvements to the mold, filling pin holes, etc and ended up with a much better finish. The 2nd spinner popped out easily. Should be smooth sailing from here.

Paul
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Old Mar 25, 2013, 02:00 PM
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eye4wings's Avatar
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Quote:
Originally Posted by Paulofthenorth View Post
Should be smooth sailing from here.

Paul
Hope you had your fingers crossed behind your back when you said that Paul!

Still maybe the modelling gremlins / fate / sod's law missed that brazen challenge!
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Old Mar 25, 2013, 02:50 PM
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That sounds great Paul!!! I am gathering ideas for the nacelle doors. have not decided which way to go. Either mechanical or servo. Not much progress, too many things pulling in different directions right now.
It will get done!! Doug B
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