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Ply Rolled Fuselage Part Deux - 1/2A " Mini Skorch "

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Ply Rolled Fuselage Part Deux - 1/2A " Mini Skorch "

Old 02-16-2015, 07:45 PM
  #326  
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I did an underhand lefty today, on a micro hotliner I recently kludged together. I held it by the vertical fin and off it went smooth as silk. Lots of power in this case.
Old 02-16-2015, 08:31 PM
  #327  
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Have you ever done a back handed discus type launch..? You can generate a lot of force and the plane will miraculously straighten itself out upon release.
I'm not kidding, you can just fling a plane like you don't have a care in the world for it and the few times I've done it [with planes I didn't care about]...it worked just fine.
It takes a "Leap of Faith" to try it.
Old 02-16-2015, 09:31 PM
  #328  
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I did flat field launches that way with hand launch gliders they do just that and zoom up high but things have to be light and no rubber bands can't risk shifting.
On the left wing tip I used thin sticky back grip tape to really generate some wango.
Old 02-16-2015, 10:16 PM
  #329  
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I suppose the easy way to check it out is to spend the 10-15 mintues it would take knock together a test bed glider out of scrap whatever, then go out and toss it a few dozen times;
Old 02-16-2015, 10:49 PM
  #330  
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The plane to test this discus launch out with are the old AMA Rule Book [20 ounce MINIMUM], 1/2 A Pylon Racers. Those planes would flub and wallow around for the first 20 - 30 feet guided by only the hands of angels until they barely got up to flying speed. They flew better than you would expect if the engine was putting out.

Last edited by combatpigg; 02-16-2015 at 10:55 PM.
Old 02-17-2015, 07:02 PM
  #331  
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A friend of mine was having a bad day with his 1/2A delta. In disgust, the next time he launched it, he slung it by the wingtip. From then on, it's been his standard launch mode.
Old 02-17-2015, 07:40 PM
  #332  
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Yes could make a completely slick delta with no hint of a center fuselage leaving only the wing tip to fling the sucker by / would make for a fast solid lifting craft for chur!
Old 02-17-2015, 08:15 PM
  #333  
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A guy who used to post at the RCU "Delta Forum" [Wiggy] launched his .32 powered deltas that way, except there was so much thrust he planted the starboard wing tip in the grass until he was ready to fling it.
I usually just grab them on the TE between the elevons and give them a feeble shove away from my chest. The rest is left up to The Angels to guide it onward and upward.
Old 02-17-2015, 08:40 PM
  #334  
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I think the Angels were laughing at my Simple 400 as it did cartwheels on the ground last fall. I still have to glue a couple joints on that one. That was a left hand launch. I wrecked a cowl on a low wing leckie too. That was a right hand launch with too little time to get to the stick. Hell's Angels? Maybe a discus launch will be next.
Old 02-17-2015, 09:15 PM
  #335  
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Originally Posted by combatpigg
A guy who used to post at the RCU "Delta Forum" [Wiggy] launched his .32 powered deltas that way, except there was so much thrust he planted the starboard wing tip in the grass until he was ready to fling it.
I usually just grab them on the TE between the elevons and give them a feeble shove away from my chest. The rest is left up to The Angels to guide it onward and upward.
I watched that several times, but was convinced he was dealing with a lighter model than any of mine. Never could get up the nerve to try it, I quit drinking before I started building deltas.
Old 02-17-2015, 09:29 PM
  #336  
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I'll make a point of videoing a 1/2 A discus launch ..but I don't think the helmet cam can be aimed to capture both the launch and the flight as well.
Old 02-18-2015, 06:08 AM
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I am sure it works fine - I think my hesitation is fear of the crunch from the first snafu. I'll practice on some parkies.

I almost launched a Demon like this - had the wingtip/fin in one hand, then I paused and imagined all the horrible things that might happen if I pin the throttle and slip or lose my grip or whatever.. visions of the aircraft pivoting 180 in my hand and eating my face - things like that. Didn't try it.


Last edited by MJD; 02-18-2015 at 06:11 AM.
Old 02-21-2015, 10:21 PM
  #338  
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Sat. I made a trip to the field to do some more testing and monitoring, I did manage to get another vid.
I tried some fat loops, rolls and messed with the throttle. Battery took 119 mah per the duration of the 1 flight shown and two engine run ups. I had to cut out after the first vid to fix one of the torque rod linkages. I will fly / vid again Sunday and continue to record as the plane gets sorted out ending with a final vid with the Cox .049 running as good as possible with a steady stream of acro and speed. On landing at the last min I flipped the flaps down but waited to late to take advantage.

Today the engine went rich as the breather line to the fuel tank was getting a rush of air. When I throttled down about half way the rpm would pick back up and not bog down rich. On the ground the following the flight I had found I had to lean it up about 3/4 turn. Best pass after dialing back the throttle during the vid hit 20,900 rpm on APC 4.75 x 4. pass hits a theoretical 79.17 mph.
I will work on getting closer and not flying so high up it doesnt take long to bust 200ft with this plane which is too high to vid without using zoom and some camera help.



https://www.youtube.com/watch?v=wZErP2cDke4

Old 02-21-2015, 10:49 PM
  #339  
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At about 3mins into the flight I figured out how to lean out the mix by backing off the throttle as you will note at that time it started to act more like a Skorch. In the hand it was 18.8k to 19.3k in the air at the start it went rich as low as 16.7k so I started to do some loops and such to shake up the mix it didn't help.. odd that I would need to back off the throttle to make it run leaner. I imagine the fuel draw was reduced enough to offset the breather tube and the fast moving cooler air over the engine. I will try to position the tube to still let overfill out of the tank without engulfing so much air while flying.
Old 02-21-2015, 11:09 PM
  #340  
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The picture is really clear with good detail at 1080, but You Tube is only giving me "stills" at that resolution, not a smooth playback.
I'm not sure what the deal is with You Tube.....all my stuff sounds "choppy" when I play it.
It was a nice day here, too...but I needed to get a jump on a Jeep restoration.
A friend's TD would do the same thing your's is doing...auto-richening. It was maddening because he had just finished building a fast looking SWR and the engine would richen up in a power dive.
We tried backplate pressure, then added a check valve..and it still richened up.
I don't recall if he ever got it sorted out.
Old 02-21-2015, 11:51 PM
  #341  
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There are a few things you can do to inspire your graphics card update the driver files for your particular card.
Cold boot the computer to refresh the ram
Let the vid load from RCU as a piggy back it will preload more of the packets and tends to play a tad fast because of it but plays
Start then pause let it load as far as it can go.
After a run thru you can try replay with the whole file in temp ram it may allow your graphics card a bit of a break
I tested it out on my comp and my cell works great smooth tracking vid in HD
I have a 1G graphics card and feeds to a 32in and 24in monitor.

I think the breather tube needs to stay away from forced inducted air. I noticed last week with muffler pressure the engine ran more consistent as in pre launch the pressure was up enough to get me closer to inflight pressure. Still the cooler air at speed caused it to richen up. I will just have to keep tweaking at it. I want to run the Cox engine RC carb to see what it can do I have used this type of carb on my 09 and it worked well. I do want to try out the Tarno carbo at some point.
Old 02-22-2015, 02:22 AM
  #342  
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That's an odd behaviour at full throttle, did you make a funnel on the tank went? I don't think thats needed, on the cox 05RC I only used a cut-of tube in the firewall.

You might want to check the position of the throttle barrel at full throttle. On some of the cox throttles the barrel can actually go well past full throttle, but it is easy to limit the throttle using the radio end-point adjustment.

On engines with a large throttle bore it is sometimes not necessary to have an absolutely full throttle opening either, the engine can sometimes run better when full throttle on the radio is set just before the barrel is completely lined up with the carb bore. This is very common on diesel conversions that use lower rpms but also for glow engines with a large prop and a large carb bore, it is good to check which barrel position will give you the best performance.

The behaviour could also indicate a too high prop load, i.e. the engine runs a little colder once the prop unloads in the air. Lots of things to test and all part of the fun.
Old 02-22-2015, 07:43 AM
  #343  
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Thanks for checking in Kris
The Cox RC carb is tame on the bore. First 2 flights I used a APC 5.75 x 3 for break in.
I had to reset the ball socket using that prop.
After yesterdays flying the ball socket is still snug compression is good two head shims.


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Last edited by Pond Skipper; 02-22-2015 at 12:23 PM.
Old 02-22-2015, 07:44 AM
  #344  
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The breather tube is short and no funnel. The carb worked fine fully open with muffler pressure last week.. barrel position is spot on, The APC 4.75 x 4 is spinning up just fine in the pits 18.8k to 19.3k was observed. Temp was around 76 F. Here is a pic of the set up non SPI cylinder / dual fluted cylinder exhaust ports directly in line with the fuselage.

- suction improved when flying drawing a larger fuel charge
- breather tube was getting some forced inducted air / yet angled cut to reduce the effect
- piston sleeve is vintage tapered for good compression
- when setting up the NV I adjusted just up to smooth top rpm and didn't push the needle for max rpm
- after flying I started up the engine again and found it rich dialed in another 3/4th turn while the engine was still warm

Note the breather tube position, I will try facing the intake back towards the tail to minimize air induction.
I will add a spring to the Needle to help lock it down so there is no migration and a solid seal with the O ring.
New carb and piston sleeve was never ran vintage late 60's thick walled has been broken in with care no lean runs about 5 tanks of fuel now.

Well have to try again next weekend weather has gone bad 22 mph wind gusts and rain. Looking for sunny weather for a good vid. The sun was low to my right caused glare in the last vid, I need to be out there while its up high in the sky.


I added a spring to the needle, the O ring seems to seal and keeps the needle from rotating in flight but to be sure
the spring is the best safe guard.


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Last edited by Pond Skipper; 02-22-2015 at 01:34 PM.
Old 02-26-2015, 06:34 AM
  #345  
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In the quest for better video I bought a 16 MP cam with 4X zoom today has a view screen and wrist remote allowing you the option not to use your smart phone app.

Campark ACT70 Helmet/Action-Body& Dash- WIFI Full HD 1080P Sport Camera 4x Zoom
http://www.ebay.com/itm/251850916125...ht_4207wt_1105

I made an offer of 145.00 and they accepted, listed at 159.95

My current one in use is just a 5 MP non zoom 30 fps at 1080 and 60 FPS max at 720 dpi.

This one can do 1920 x 1080 60 fps!
As an option for flying very fast anything over 150mph 1280 x 720 120 fps!


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[TD="width: 257"]2 inch TFT LCD
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& Frame Rate

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[TD="width: 257"]1920×1080(1080P)@60fps
1920×1080P(10080P)@30fps
1280×720(720P)@120fps
1280×720(720P)@60fps
1280×720(720P)@30fps
848×480(WVGA)@240fps
[/TD]
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[TD="width: 155"]Video Codec
[/TD]
[TD="width: 257"]H.264
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[TD="width: 257"]MP4
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[TD="width: 257"]5s, 10s, 15s
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[TD="width: 257"]1, 3, 5, 10, 20 at a time
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[TD="width: 257"]Built-in
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[TD="width: 257"]3.7V/ 1000mAh Li-polymer battery
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[TD="width: 257"]Support Micro SD card up to 32GB
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[TD="width: 155"]G sensor
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[TD="width: 257"]Built-in
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[TD="width: 257"]Mini HDMI connector
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[TD="width: 257"]USB 2.0
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[TD="width: 257"]59×47×39mm
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[TD="width: 257"]72 grams(with battery)
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Last edited by Pond Skipper; 02-26-2015 at 06:36 AM.
Old 02-26-2015, 06:47 AM
  #346  
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At only 5 mp at 30 fps this is the quality of still shot images taken from the video on a sunny day.
With the 16 mp cam at 60 fps and 4x zoom I should be able to greatly improve video efforts
allowing me to pluck out still shots from the vid worth saving.

Currently the only good clear shots must be within 15ft of the cam.
These passes are more typical around 30 ft away.
To be fair if you have a slow flying plane the 5mp cams do reasonably well.





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Old 02-26-2015, 06:55 AM
  #347  
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This example of the plane within 10 feet of the camera is reasonble even on a cloudy day.

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Old 02-26-2015, 09:40 PM
  #348  
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I'm anxious to see how well your new camera performs..!
Where my "aim" gets sloppy is at extreme ends of my old neck's range of motion. It's tough to be zoomed in enough to see detail of the plane and also skilled / agile enough to keep the hard hat moving in sync with the plane when zoomed in. A lighter camera will definitely help with that.
I think you would have a good laugh if you saw how....bulky my helmet camera is.
Old 02-26-2015, 10:35 PM
  #349  
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6.84 oz as shown all up weight

The new 16 MP has presets on the zoom that can be set with app or the wristband wifi remote 2x , 3 and 4 zoom I would imagine 2x or 3x will be enough allowing close passes, the camera has a view angle of 150 degs the 5 MP has a 120 deg.
So you just have to fly and not think about being in frame.


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Old 03-15-2015, 07:12 AM
  #350  
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It has been 17 days since I bought the camera from the seller on ebay he claims the snow has messed up one of his shipments I have asked for feed back he has responded each time still no clear answer I will have to cancel the order soon if he doesn't make it happen. Bummer as this was bought at a reasonable price $145 others want 195 up to 239.

I will try and get a clean run with the TD .049 today. I hope I have sorted out the fuel loading issue by putting a reduction tube on the breather line I think incoming air at flying speed is causing tank pressure throwing off the needle setting. The cylinder is SPI it should be charging the crankcase - perhaps at speed the rushing air is increasing this effect as one exhaust port is facing forward. I could start off a tad lean on the ground and hope it richens up before fuel flow dies off and the engine quits. The restrictor tube may help stabilize needle settings on the ground and in the air. Should be interesting to see if things have improved. The first 2 days of flying was muffled with non SPI so no in air changes occurred.
Will take a vid with the 5 MP cam wish it was with the 16 MP arrggg. I might try the Dynamite Speed Logger today but hesitate as this thing is pushing the CG, may have to wait for the 09 plane. Steady engine performance will be enough if I can get it on vid.

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