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Old 01-11-2017, 08:03 AM   #1
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Default Sophisticated Lady elec conv and mods.

Building an old Sophisticated Lady kit. Will have a nose mounted elec motor.

Built and flew a GL many years ago. Tweaked that and as I recall reduced decalage by shimming up the TE of the wing and also moved the CG back a good amount from plan location. Ended up being an awesome thermal sniffer. Nearly lost it several times...

So... I am building the SL with a conventional tail instead of the t-tail as designed. If I lay the stab directly on top of the fuse, it is about -1.5 to the wing, according to the plan sheet. I'm tempted to leave it there given my prev. experience with the GL. The stab is already sanded with a bit of neg camber as well.

All my tweaks on the GL were seat of pants, and long ago. Anyone with experience on either of these particular models that cares to critique this plan??
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Old 01-11-2017, 08:19 AM   #2
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Some pics off current progress...
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Old 01-11-2017, 08:28 AM   #3
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Well never mind images for now. Site wont accept them direct from my phone as is and I can't take lower res shots right now. It's just a built up balsa wing and fuse/tail. Nothing special, or maybe it is nowadays...
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Old 01-11-2017, 08:29 AM   #4
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I'll try some new pics tomorrow.
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Old 01-12-2017, 12:34 AM   #5
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Good little project....Subscribed.....
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Old 01-12-2017, 03:16 AM   #6
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Pics...

I extended the LE of the fin down to intersect the bottom sheeting. Changed the shape of fin and rudder to accommodate the fuse mounted stab. Will add dorsal and tri stock to reinforce once the tail group is glued.

Any opinions on the decalage change?? Fuse build so far was 100% focused on being square and true between wing and tail. The nose will also be once I finalize the power system. Nose as designed is too narrow for a motor so the #1 former will be a bit wider.

I hate the idea of trying to cut/sand a +/- 1* shim for the stab as the fuse top is perfect flat relative to the wing saddle right now.


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Old 01-12-2017, 05:28 AM   #7
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Stacking up all the various kit supplied hardware and wood left to finish it, and estimated covering weight, airframe should come in around 18oz.

Pretty confident it will be less as that was with various parts in bags and more wood than will actually be used.

That leaves me 8-10 oz for electrics, which should be easy, to keep within the weight spec as a pure glider. Placing as much of the weight under the canopy as possible, even if it means leaving out the dummy pilot😀
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Old 01-12-2017, 07:22 PM   #8
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Nice job so far.....
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Old 01-28-2017, 04:02 AM   #9
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Waiting for some electrics to show up so I can finish the fuse build.

Got the wing covered, just need to shrink a little washout.


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Old 01-29-2017, 02:56 AM   #10
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Electrics showed up today. Working on a firewall to mount the motor. Mockup of components looks like I can shorten the nose a bit, which helps because the fuse sides as designed are very short(height) at the nose and didn't give much structure to attach a firewall to. I think it will work out ok.


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Old 01-29-2017, 03:06 AM   #11
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Also with the electrics in hand now I'm sitting conservatively right in the middle/lower end of the spec'd weight as a pure glider. Hopefully that bears out when it done!?!
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Old 02-01-2017, 09:42 AM   #12
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Firewall done, motor mounted and test run. Forward fuse done except for mounting the canopy which needs to be shortend from design, and some fairing work around the spinner.

Horizontal tail is glued, covered. Vert tail is next and then the fuse is ready to finish covering. Mocked up pushrod routing but didnt actually set them in place permanently yet.
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Old 02-01-2017, 10:05 PM   #13
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Pics...


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Old 02-04-2017, 08:36 AM   #14
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Gforce 400 1250kv. Ran it with a 9x6 folder, @180W. With a 8x4.5 folder, around 115W , but the batt was near LVC.

Will test again tomorrow with a fully charged batt. Leaning toward the 8x4.5 either way. I think that will be more than enough thrust.
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Old 02-08-2017, 05:04 AM   #15
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Almost ready for maiden. Just need to determine the final batt location for correct CG.

Might add some more blue stripes on the tail...


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Old 02-10-2017, 06:40 AM   #16
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CG is good with a 1300 3s batt in the nose. First flights will be on that.

Rtf weight with the 1300 3s is 26.7 oz, just under the midrange of the spec'd weight as a pure glider. Happy about that!! Gives me lots of room to add more batt capacity. Might go to a seperate batt for rhe rx/servos.


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Old 02-23-2017, 07:45 AM   #17
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Was a little windy, but finally dry and warm enough to get in some test glides to get this thing trimmed.

Did a dozen or so launches, no power yet. Some from flat ground first and then some from a 10ft slope onto the flat.

Flew great with only a couple clicks of trim. Need to get onto a bigger field so I can power it up.

Will try to post up some vids of the first flights.
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Old 02-24-2017, 01:37 AM   #18
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http://vid1174.photobucket.com/album...psxz3mtjka.mp4
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Old 02-24-2017, 01:38 AM   #19
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http://vid1174.photobucket.com/album...psgvht3lza.mp4
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Old 02-24-2017, 05:21 AM   #20
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Made the first flight under power tonight. Flew for about 10 min, til my hands were numb... 32* and 15 mph wind, completely overcast. Not exactly glider weather, but it flew great!!

I was only planning to fly straight into the wind and power up to get a feel for the trim changes needed under power. Ended up flying circuits around the field at low altitude to begin with, using the motor to make headway on the upwind leg and then off power zooming back around on the downwind.

Then I did some 3/4 throttle climbs to 2-300 ft and glide back to ground. Climb rate is excellent!

Overall I am extremely happy with how it turned out! And I think there are some tweaks left to make it even better. CG is around the recommended position, very stable, but kinda mushy on the elev. I am going to move it back gradually to where I like it. Also, I originally thought the 1300mah batt would be the minimum capacity wise, but am now thinking I could go even smaller, and possibly even drop to a 2s as it has more than enough power on 3s.

Waiting for thermal weather!!!
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Old 02-26-2017, 06:06 AM   #21
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What am I doing wrong that results in a message that security token has expired when I try to post?? Struggling to keep posting here when this happens constantly....
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