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Top Flite GS P-47 sports scale; diary of a build

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Top Flite GS P-47 sports scale; diary of a build

Old 05-31-2014, 01:17 PM
  #1451  
TonyBuilder
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Ok, so I mounted the engine to the test stand and tested the two ignitions for spark, I could not get it to run the other day. The one thing I did not check was the pick up, so I put the new one on and wha-la spark on both ignition modules, that's good news. So this must have been the root of all the issues. My arm is still a mess from last week so we pulled the club starter out, it is a big heavy duty on a marine 12v battery. It started right up, we tuned it and it ran great. With the Bowman ring it was idling like a watch, 1500rpm, and peaking at 6300rpm on the factory settings, 1.5 turns out. The low end was a bit rich so we leaned it and it ran even better.

I started it about 4 times with the starter and I could kill the engine and start it with one flip, did that about 4x. So I think my issues are past with the New pick up, the Bowman ring and the new carb. I will use the club starter for now, my arm is shot.

This is is a big relief and sends new energy to the build.


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Last edited by TonyBuilder; 05-31-2014 at 01:22 PM.
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Old 05-31-2014, 01:48 PM
  #1452  
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A little off topic, I got a Mobius ActionCam and I have been testing it out on the Sbach. Figuring out the best mounting method. I will make some duplicate hatches that I can swap out to mount the camera. I want a mount in the cockpit, one on the wing, and one on the fuselage. I want to see what the cowl flaps do, how they open under different conditions, is there flutter. I can also check the control surfaces too.





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Old 05-31-2014, 03:56 PM
  #1453  
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How do you like the overall quality of the möbius? Been thinking about grabbing one. Glad you figured out the pick up.
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Old 05-31-2014, 04:57 PM
  #1454  
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Great quality and the price is right, $79
it is much smaller then the gopro and $200 less. I will post some of the test videos, working on getting the vibration down.

TB
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Old 05-31-2014, 08:56 PM
  #1455  
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I know what u mean by sore arm. I did same on my first run of my 50cc on my P-40. Arm was so sore i could barely hold my coffee cup.

My friend gave me two starters - one for small and one monster for my 50cc. I picked up a Jump Starter with air compressor, light, usb plug, 12vdc cig jack, and jumper cables. Works great. Starts right up each time and like yours i can flip it once to start if it has been running.

Glad your engine is purring!!

Keith
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Old 06-01-2014, 01:56 AM
  #1456  
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I think once the engine is all broken in it may behave like all my other engines but if not then at least the starter will start it....every time

I will put the engine back on the Sbach later next week to run in the ring.


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Old 06-01-2014, 03:13 PM
  #1457  
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I'm going to the field in the morning to test fire the 85. I need it to start 10x in a row before I put it back on the Sbach for break in, need 2hr to seat the ring.

I did some more test with the mobius camera to find a good mounting method. Hard mount has to much vibration, a soft mount with 1/2 foam worked best. I will post the video tonight. The plan is to eventually mount the camera inside the wing at the gun camera location.


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Last edited by TonyBuilder; 06-01-2014 at 03:21 PM.
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Old 06-02-2014, 03:22 AM
  #1458  
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Here is the test video of the mounting method on my Sbach. The Mobius camera is soft mounted in a box of foam rubber. This is with the EME120, I will do another test with the DLE85 to see if there is more or less vibration. There is still some vibration mostly at idle and lower speeds.

http://youtu.be/VcHqEXR4eHs
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Old 06-02-2014, 04:47 AM
  #1459  
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Great video!
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Old 06-02-2014, 06:11 AM
  #1460  
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Here a pic of the soft mount I am using. It is glued to a piece of carbon fiber laminate, and the laminate is held to the covering with two sided goo glue tape. Further tests today.







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Old 06-02-2014, 12:11 PM
  #1461  
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Today was the last day of engine testing on the DLE85, do or die. She hand started right up like a good little DLE should.

First run was to prime a few turns, then choke on, flip 2-3x and pop, then no choke, flip 4-5 times and she started. Ran great, low idle was 1400-1500, smooth as silk.

Hot starts where one or two flips and she started. restarts went normal, prime 3 turns, choke for 3x then 4-6x to start. I think I have a true DLE. I'm done testing, on with the building.

Start video.

http://youtu.be/ZlR_Ri_uA3w

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Last edited by TonyBuilder; 06-02-2014 at 12:17 PM.
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Old 06-02-2014, 02:25 PM
  #1462  
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So my arm is still toast and I was doing the math. On an average weekend fly day there could be anywhere from 50-75 prop flips per plane being flown. So a weekend could be 100-150 flips per plane. That would be a good 200 per weekend the way I fly. I do see a big starter in the near future.


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Old 06-02-2014, 03:27 PM
  #1463  
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Tony, I have my first gas engine 50cc and once I start it that morning, WITH A STARTER, after that it is normally a couple flips and she runs great. It seems getting the gas up to the engine is the big thing and even it if sits a couple of hours she normally starts in a couple of flips - you should be okay with 30 flips a day.......... In my case, I have the starter there ready if I go past 5 flips............!!

Keith
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Old 06-02-2014, 04:35 PM
  #1464  
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Originally Posted by Corsair2013 View Post
Tony, I have my first gas engine 50cc and once I start it that morning, WITH A STARTER, after that it is normally a couple flips and she runs great. It seems getting the gas up to the engine is the big thing and even it if sits a couple of hours she normally starts in a couple of flips - you should be okay with 30 flips a day.......... In my case, I have the starter there ready if I go past 5 flips............!!

Keith
Keith, I have experienced with this engine easy starts on the first and difficult starts there after, then difficult first starts and easy starts from there on. All my other engines (DLE's) start right up on the first and the last flight. I will give the engine the benefit of a doubt with some of the issues it has had, now that they are worked out it feels more like a DLE. I will just use the starter as a last resort but if I can get an engine to start with 10 or less flips I will take that.

I am just relived I don't have to find a new engine.

TB

Last edited by TonyBuilder; 06-03-2014 at 02:16 AM.
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Old 06-03-2014, 01:38 PM
  #1465  
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Here is the video test for the mount that I will use to monitor the cowl flaps during the test flights. I think this will show me how they are working, if they open during different conditions and how they hold up to flutter.

http://youtu.be/6FmQbpB1OQQ TB
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Old 06-03-2014, 02:35 PM
  #1466  
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Looks good tony. I just used yout tip with the masking tape for fiberglassing. I must say, it's a good one. Thanks.
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Old 06-04-2014, 03:04 AM
  #1467  
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Glad it worked out for you Steve.

Well after a nice long break, I am all recharged and ready to go. It takes me a few days to get back into build mode< I started Monday and today I woke up on fire to build so I am excited to be back at it. With the build in progress and having to replicate the left wing I had to go back and study what I did. I am making the hinges for the ailerons and flaps. Once I get them done and cut in I will layup the hinge pockets.

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Old 06-04-2014, 03:23 AM
  #1468  
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Glad to see you back at it. Now no more messing around, you got a chippy on the way! Can't wait to see it completed.
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Old 06-04-2014, 03:28 AM
  #1469  
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Originally Posted by stevegauth30 View Post
Glad to see you back at it. Now no more messing around, you got a chippy on the way! Can't wait to see it completed.

You bet, I'm going to take a page out of Sam's book and put in 12hr days. I think I can get the wing done this week, then its all finishing from there.


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Old 06-04-2014, 05:43 AM
  #1470  
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Default Back in Black

The aileron hinges are made from 1/16" G-10. I went with black because I may not paint them, but probably will. I had cut all the hinges for both wings so fabricating was not as bad as starting from scratch.



I pair them up in there respective groups and sand them as a whole.



Then I add the filler pieces and sand them down, they are ready to fit into the wing and aileron.



Man I am rusty, but it is all coming back to me now


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Old 06-04-2014, 03:01 PM
  #1471  
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I have been working on the left wings aileron. The hinges are made up, and ready to attach to the wing.

I made a jig to drill the hinges into the aileron. This lets me square up to the LE and then drill an even hole into the aileron. I am using a 1/4x12? drill bit.



I cut a 1/4" slot in the aileron for the hinge to fit into and then drilled them out.



I used the right wings aileron as a template to get the hinges in the same location. A little fitting is required to get them right. These are the Fries aileron hinge.



I will use the same template to drill the hinges into the wing. I need to install the TE of the sheeting first. That will be 1/16" balsa with 1/32" birch ply laminated together.



I am gaining momentum


Here is the video version of this post.

http://youtu.be/sBeFVmjNTRs

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Last edited by TonyBuilder; 06-04-2014 at 03:32 PM.
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Old 06-04-2014, 04:17 PM
  #1472  
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Tony, it's a joy to watch you build, although I'm getting tired. Yes, you certainly are gaining momentum. Outstanding.
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Old 06-04-2014, 04:44 PM
  #1473  
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hi just finished one all fiberglass and paint done to the french p47 don't have any pics yet but will sone this thing is really great pleased with the out come 32 lbs.
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Old 06-04-2014, 04:58 PM
  #1474  
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Default p47

I have one all done it is powered with a dle 85 using a two blade 2710 tool a little to get use to starting but now runs great what i do is full choke with throdle closed. two flips and it sputters open choke one flip starts my7 god what power with the 27x10
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Old 06-05-2014, 02:11 AM
  #1475  
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The bottom skin trailing edge is in.

This provides the profile for the hinge pocket and allows me to completely hinge the aileron before I sheet the bottom of the wing.



Once I layup the hinge pocket sleeve I will glue it into the framing and close up the pocket.



The same template will be used to drill the hinges in. A square line is marked to keep the template aligned, and white tape to hold it down.



This should align the bottom of the aileron with the bottom of the wing.



Once the aileron is hinged I can layup the pocket sleeve.


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