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CARF-Models P-47 Thunderbolt

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CARF-Models P-47 Thunderbolt

Old 10-11-2020, 11:53 AM
  #1026  
orthobird
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Got the throttle servo installed, as well as all 4 exhaust pipes.








Thanks to this thread, It gave me a great idea, and I used the KS do it yourself muffler parts, and I got the DA 50 stub / exhaust flange (X4) and then brazed a 90 degree turn to each one.

Then I went to LOWE's and purchased two of the 24" long hot water heater pipes, cut each one in half, and then brazed the other end to the KS 90 degree tube. the tubes from KS are 25 mm OD for the DA 50.











Need to do the choke servo and install a fuel tank, gas lines, and 2 ignitions, and she will be ready for a crank up. I am excited to hear how it sounds, since all 4 cylinders have their own air exhaust exit pipe.
Old 10-11-2020, 02:09 PM
  #1027  
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went back and read the manual. I saw where they had the exhaust section, so I ran over to Home Depot and purchased these:





then I was able to cut the tips off and braze the 3/4" copper splice onto it, then recut them.


Still need to do some more smoothing out of the tips so that it is flush with the fuselage surface.






Old 10-12-2020, 03:41 AM
  #1028  
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Default CARF P-47 Down thrust and right thrust

Wanted to add this on to here, for anyone else wants to use this as reference.

It is with regards to the down thrust.

As far as I can see, from making measurements, the DOME does not have down thrust. it does have built in about 2.7 degrees of right thrust.








Old 11-15-2020, 02:42 PM
  #1029  
orthobird
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Getting a lit bit closer. For the 1st time, it is up on its wheels.





question for you all, is your version of the airplane open like this in the aft aspect of the wing root?




Old 11-15-2020, 06:01 PM
  #1030  
IFLYBVM2
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The older kits were not, but the the wing is cut out like that on all of the newer ones that I have seen.
- Mike O.
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Old 11-16-2020, 02:05 AM
  #1031  
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....yes - I can confirm that this is correct. Mine is exactly like that.
Bob
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Old 11-16-2020, 07:47 AM
  #1032  
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Yes...I am working on a bubble top and Razorback and they are both like that
jimmy
Old 11-17-2020, 08:33 AM
  #1033  
Craig B.
 
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My kit is an older one and doesn’t have that cut out. What is the purpose of the cut out?
Old 11-17-2020, 08:49 AM
  #1034  
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Default Aft wing cutout

The cut out makes it MUCH easier to access the equipment inside the plane with the wings on. I have an older kit and had to cut mine out manually but I'm glad I did. While you don't need access there often with the wing on you will be happy you have it cut out the first time you do.

Blue Skies,
Old 11-17-2020, 08:51 AM
  #1035  
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Originally Posted by Craig B. View Post
My kit is an older one and doesn’t have that cut out. What is the purpose of the cut out?
I have wondered the same, Craig, as mine does not have it either.
My only guess is that maybe with the cutout, you could have some small access to the gear inside the fuse without removing the entire wing. (Just the obvious removal of the belly pan-one screw)
If that's not it, then I dunno.
Mike O.
Old 11-18-2020, 06:27 PM
  #1036  
orthobird
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Just installed the choke servo. Getting closer to the completion. (not the detailed stuff, just to be flight ready) I also have all the gear working, as well as the sequencer programed so that I can get the doors open 1st and then the retracts come in (up) then the doors close. I did install the Jet tronics valves. Very cool.

I installed 3 air tanks, and so far, with the tanks pressurized to 50 lbs, I can get 6 cycles.




Old 11-19-2020, 09:16 PM
  #1037  
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Wow....with a DA-200 ! Following this build.

GM
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orthobird (11-20-2020)
Old 11-20-2020, 09:25 PM
  #1038  
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so this is what it looks like.

I am glad they cut that area out, because I am able to connect my batteries thru there.
And this made it easy for me to make a plug into the rear area for the servos.





Old 11-21-2020, 12:35 PM
  #1039  
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Well darn it!

I did the 1st start up, all that was well.

When i went to take airplane back to the shop, I noticed the tail wheel mount is broken!

when I did a quick inspection, it appears that plate is 1/16th plywood plate?? ***


here is the sound of the motor:


Old 11-21-2020, 03:35 PM
  #1040  
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Got her fixed.


Just showing what I did for any future reference.



this is the broken part.

I pieced it all back together and will use it as a template.

I drilled to make the holes appear that I will need on my new mount.

I made a sandwich of G10 material with epoxy and Finnish aircraft grade plywood.

to the right is the finished product.


I am happy now. Next is to check the CG and the weight.
Old 11-21-2020, 08:09 PM
  #1041  
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Got the CG checked.

I went with a XICOY and using the 15.5 cm mark from the LE at the root.

With this, I am at 54 pounds.

and slightly tail heavy.

this can be fixed quite easily by moving the batteries forward. Currently, the batteries are in the back, as well as the tray.

Worse case scenario, is to move that tray forward.


but I will try the batteries 1st.





15.5 cm aft of the LE at the root. The CG point.

Old 11-22-2020, 12:52 AM
  #1042  
j ghazal
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Great, and it is 9.1cm from mains to desired CG if i understand the scheme?
Old 11-22-2020, 02:03 AM
  #1043  
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Originally Posted by IFLYBVM2 View Post
I have wondered the same, Craig, as mine does not have it either.
My only guess is that maybe with the cutout, you could have some small access to the gear inside the fuse without removing the entire wing. (Just the obvious removal of the belly pan-one screw)
If that's not it, then I dunno.
Mike O.
sounds about right doesn’t it Mike?
Old 11-22-2020, 02:48 AM
  #1044  
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Originally Posted by j ghazal View Post
Great, and it is 9.1cm from mains to desired CG if i understand the scheme?

I will go and remeasure this. I want to say, that based on my 1st measurement, it was near to that. I will check in my shop when I get out there soon.
Old 11-22-2020, 04:21 AM
  #1045  
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I understand your question now.

yes, to answer your question,

using the Xicoy, 2 measurements need to be made.

One is the distance from the center of the tail wheel to the center of the main wheels.

the 2nd, is the distance from the main wheels to the desired CG


Now, the caveat is that the input into the xicoy will be equal to the output (information).

SO, If I am wrong in my measurements, then the CG will be off as well. and the information is not as useful.

I am known to have had this happen to me before.

and one of the factors that can result in this is:

1. I have been having lower back issues, it is hard for me to pick up that airplane and put it on a table. And likewise, it is hard for me to get down on the floor and make very accurate measurements.
2. doing the measurements require them to be extremely accurate, so you may need to use right angle tools. You need to make measurements down to the mm.
3. Ideally, one should place the aircraft on a work bench to do the measurements. By doing so, it becomes more accurate as one can see things better under the airplane.
4. on a warbird, doing the CG check is with the wheels down. SO it will not be 100% representative of the CG of the aircraft once it is up in the air and the wheels are retracted.
5. the CG measurements need to be made with the tail elevated, such that, it will make the airplane level with the horizon.






Old 11-23-2020, 02:18 PM
  #1046  
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Question for the P-47 builders??


I set up the tail doors to open with the spring. When I installed the two springs, it was way too tight, and looked to put too much stress on the doors. SO much so, that one of the little arms snapped off. I was able to re-glue them, and now, with only using the froward wire, it works great. Anyone else experience this?




Old 11-23-2020, 03:11 PM
  #1047  
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Default TW Doors

Originally Posted by orthobird View Post
Question for the P-47 builders??


I set up the tail doors to open with the spring. When I installed the two springs, it was way too tight, and looked to put too much stress on the doors. SO much so, that one of the little arms snapped off. I was able to re-glue them, and now, with only using the froward wire, it works great. Anyone else experience this?



I think you will find that in the long run, the 'close with the wire' setup is not very desirable-mine was converted over to 2 mini servos, and most that I have seen are using small pneumatic cylinders.
The wire seems to be a bit rough on the phenolic hinge parts, as you have witnessed.
-Mike O.
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Old 11-23-2020, 03:12 PM
  #1048  
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Hey, Cam !! Gabriel here, from FG. Glad you have the same SN so I could recognize you. Didn't know you also flew warbirds! Haha. I actually just maiden-ed my first big warbird this weekend. You can see it over in the CARF P-51/Fiberclassics thread.

This CARF P-47 is a really sweet bird, and your engine choice is fantastic in my opinion. I'll keep watching this space!

GM
Old 11-23-2020, 05:45 PM
  #1049  
orthobird
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Thank you very much Mike. my airplane was tail heavy, slightly, not by much, so once I get the AMA over 55 pounds permit, and I do the maiden, I will see about adding the pilot and the cylinders in the back once I see how she flies with the batteries moved forward all the way.

Old 11-23-2020, 05:46 PM
  #1050  
orthobird
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Hello Gabriel, congratulations on your maiden. Sorry about the top cowl. Sure you can get it fixed.

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