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Old Feb 01, 2013, 03:00 AM
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Description: Top of tail on an iPad for scale.
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Old Feb 01, 2013, 03:03 AM
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Old Feb 01, 2013, 03:05 AM
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Description: Bottom of tail, no carbon tip caps.
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Old Feb 01, 2013, 03:13 AM
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Tail is out and I'm fairly happy for a first attempt.

Need to cut better foam cores. This is really the main point as I'm sure it all stems from there.

Other than that I need to position the mylar better so everything lines up better. I think the disser worked well considering it was hand placed and cut strips.

Seems very rigid and weighs 8g. Again for a first attempt I'm happy and it's certainly usable. Well for a have fun and learn tequnique kind of way.

Next up the fuz and vertical stab. Hope to have better cores for the vert.

Tom
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Old Feb 01, 2013, 08:05 AM
Turn down for what?
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United States, IN, Indianapolis
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Tom, I think that tail looks great.

Ryan
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Old Feb 01, 2013, 02:03 PM
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Hmm, looking at equipping my model and just wondering if anybody has used ripmax sd100 for tail/rudder and sd150 for the wings? Looks like they should work well.

Any good or are there better out there for the cash?

Tom
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Old Feb 01, 2013, 02:18 PM
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Looks just like a D47 to me. I've had D60s in wings before and they were good little servos. I couldn't detect any slop in them and they had good resolution. I know Jun C had D47s on ailerons of his Neos and swapped them out because of flutter issues. But he is launching well over 200 ft, so for us mere mortals the D47 isn't a bad choice. Personally I doubt I'd flutter a wing with D47s (throwing ~160'), but I prefer to use beefier servos anyway.
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Old Feb 08, 2013, 02:41 AM
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Vertical stab not good, I'll have to do another one.

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Old Feb 08, 2013, 02:43 AM
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Old Feb 08, 2013, 03:08 AM
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The vert did not go as planned. I redesigned my templates and managed to achieve a good core from help over on the composites forum. I was very pleased with myself.

I then cut the mylar's and prepared everything ready to go. Pump, bag, tools, cloth etc, I was set.

I had decided to do a carbon leading edge and cut a strip of fabric backed with ATT(Adhesive Transfer Tape). As this was 200g carbon I neglected to include a carbon spar as I thought the leading edge cap might provide the rigidity required. So the carbon was stuck to the leading edge and wet out and put aside while I layed up the skins on the mylar's and wet out.

Now feeling very pleased with myself I turned to put the whole lot together only to find the carbon had come away from the leading edge and would not stick back down no matter what I did. So, off came the carbon and on the mylar went to the core.

This all went into the bag and was vacuumed to see what would happen.

The result can be seen in the previous posts. I'm quite pleased with the finish, and the torsional rigidity provided by the disser but the longitudinal strength is quite poor.

I think the carbon I used was too heavy and as it was woven from 3k very hard to form on such a tight radius. Never mind. We live and learn.

I now have some lighter carbon ordered from f&g so should not have the problem again. Additionally, I will now be including a spar to all my stabs because for the weight cost, why not?

Now to get on with the wings and fuz.
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Old Feb 08, 2013, 07:50 AM
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You really need a proper spar on your tails, especially on the vertical. Just doing a LE wrap of carbon won't cut it. For mine I cut a vertical slit about six inches long in the core where the spar will go and slide in a pre-cured strip of bias cut 1.6oz glass. Then I lay a single strand of spread 12k tow over the top on either side. It's not the only way, but it works for me. I'm thinking about replacing this method with .75 mm carbon rods, another proven method.
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Old Feb 08, 2013, 07:52 AM
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Disser cloth for wings.

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Old Feb 08, 2013, 07:58 AM
Turn down for what?
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I am very impressed with your work so far.

Ryan
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Old Feb 08, 2013, 01:19 PM
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Thank you Ryan.

I have bagged the wings today but I don't think they will be any good. It's all in the materials and I didn't have any Mylar for them. I used acrylic sheet which might work but I'm doubtful. I have work tomorrow so will pull them out the bag on Sunday. I'll know then if I have to do them again.

In the mean time I need to do new vert stab.

Tom
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Old Feb 10, 2013, 08:48 AM
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Got the wing out the bag

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