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Nanchang mods

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keithmckinley

Joined: 11 Aug 2008
Posts: 434

Posted: Thu Jun 23, 2011 6:31 pm Post subject: Nanchang mods

I'm curious if anyone has any experience with the following on a CJ:



1. A "closed" cowling mod like the one on Hal Morely's CJ with some sort of rear louvers.



2. An inverted oil tank system or taking the stock tank vent and running it to the rear of the airplane.



Thank you,



Keith McKinley

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cjpilot710(at)aol.com
Guest

Posted: Fri Jun 24, 2011 2:09 am Post subject: Nanchang mods

I have not personally seen a set up like Hal's before.  A rear louver  system was produced on the 52TWs and 52Ws.  I remember some the guys had a  few bugs for a while.  Aerodynamic & operational wise I'm not  convinced they are any better.  I'm of the old school where you don't go to  something new unless what you have is worn out and needs to be replaced.   Than spend the time and money on the new idea.

  

 An inverted oil system is do able.  There is plenty of room under the  cowl.  Running a vent line to the tail, while it sound "clean" (unless you  run it externally on the skin- yuk! )  the number of bulkheads and spar web  you would need to transverses makes it a complicated task. 

  

 Under the cowl you might use a modified Yak 52 system.  The oil tank  would need to modified with a oil pick up point on the top of the tank somewhere  and a ball slid tube and "T" inserted in the feed line somewhere.

  

 All this is a do able project, which I contemplated at length one  time.  My decision not to, was based on the only 4 facts as I SEE  them.

  

 1. The CJ is not a good design (was not meant to be) for extended  inverted flight.

 2. I do not do extended inverted flight.

 3. The short inverted flight that I do - do, not that much oil goes  overboard.

 4. I rather spend the money on petrol.

  

 BTAIM, that is the great thing our airplanes in the Experimental /  Exposition cat.  We can carry out our dreams and ideas to make a  better mouse trap or at least one that has our mark on it.  Me? I  put on a gas machine gun and bomb shackles that work.  (Plus I have a  neat looking gun sight) 

  

 Jim "Pappy" Goolsby  (Well I'm off to Power Plant ground school.   Maybe at 71 I'm ready for it)

  

  

  

  

  In a message dated 6/23/2011 10:39:55 P.M. Eastern Daylight Time,  keith.mckinley(at)townisp.com writes:

  	  Quote: 	
		  -->    Yak-List message posted by: "keithmckinley"    <keith.mckinley(at)townisp.com>



I'm curious if anyone has any    experience with the following on a CJ:



1. A "closed" cowling mod like    the one on Hal Morely's CJ with some sort of rear louvers.



2. An    inverted oil tank system or taking the stock tank vent and running it to the    rear of the airplane.



Thank you,



Keith    McKinley



--------

Keith    McKinley

700HS

KFIT





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yakjock(at)gmail.com
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Posted: Fri Jun 24, 2011 5:41 am Post subject: Nanchang mods

Keith,



I have not seen a cowling with rear vent controls.  I use a Sukhoi iris on the front with a remote actuator.  At 16,500' feet, 5 degrees f, for about 2.5 hours engine stayed warm.  Also works well on descents.  



My oil tank vent line runs Sukhoi style from the tank to the rear of the plane.  No oil down the side so far.  



Hal

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keithmckinley

Joined: 11 Aug 2008
Posts: 434

Posted: Fri Jun 24, 2011 12:02 pm Post subject: Re: Nanchang mods

After two 3 minute routines, the belly of my CJ is covered, even with the oil level fairly low. I don't do extended inverted flight either but just pushing over the top of a vertical maneuver or during a hesitation roll or even a HH is enough to let it rip.



Realistically it's not a lot of oil but it just spreads out everywhere and gets into every conceivable crack and crevice. Plus that 25w-60 is like tar!



I just started thinking about the possibility of running a vent tube to the tail after looking at a similar set up in a Pitts 12.



Good luck with school!



K

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gjhagstrom(at)aol.com
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Posted: Fri Jun 24, 2011 6:57 pm Post subject: Nanchang mods

Pappy 

    

   whats your design for the bomb shackles and gas m/g  ??

   I sure could use them ..

    

   Thanks ,Gary

   N34FP

 

 

   

 

 

   --

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cjpilot710(at)aol.com
Guest

Posted: Sat Jun 25, 2011 4:21 pm Post subject: Nanchang mods

The gas gun I brought from Bill Blackwell.  I believe it had  been built for the Tora Tora movie and never used.  To me its a  little to heavy and at OSH last year I saw a simpler and lighter one, I want to  try.

  

 The shackles I designed and made myself.  They are made out of square  aluminum tubing that is pop riveted together.  Very light only about 3  lbs.  They bolt on to the wing using the same bolts as the wing tank cover  plate.  I ran a push pull cable, though the leading edge to the  cockpit.  It took two days to build and install.  I can remove or  install the shackles in about 20 mins. 

  

 Bombs I made were replicas of Jap Type 97 GPs.  These were about 4  feet long and 10 in diameter.  Made of Styrofoam and covered with fiber  glass.  The fins were made of soft aluminum flashing.  Total weight  was less than 8 lbs.  When dropped they flew perfect and looked so real - -  its was unreal.  They did slow the airplane down about 10 kts.  When  they hit the ground they'd bust up some but could be rebuilt.

  

 That's has been a lot of fun learning how to drop them!  The whole  idea started as an act for a warbird airshow.  Who knows - - - -maybe  someday. 

  

 Jim "Pappy" Goolsby

  

  In a message dated 6/24/2011 10:58:00 P.M. Eastern Daylight Time,  gjhagstrom(at)aol.com writes:

  	  Quote: 	
		     Pappy 

    

   whats your design for the bomb shackles and gas m/g  ??

   I sure could use them ..

    

   Thanks ,Gary

   N34FP

   

   -----Original    Message-----

From: cjpilot710 <cjpilot710(at)aol.com>

To: yak-list    <yak-list(at)matronics.com>

Sent: Fri, Jun 24, 2011 3:09 am

Subject:    Re: Nanchang mods



      I have not personally seen a set up like Hal's before.  A rear    louver system was produced on the 52TWs and 52Ws.  I remember some the    guys had a few bugs for a while.  Aerodynamic & operational    wise I'm not convinced they are any better.  I'm of the old school    where you don't go to something new unless what you have is worn out and needs    to be replaced.  Than spend the time and money on the new idea.

    

   An inverted oil system is do able.  There is plenty of room under    the cowl.  Running a vent line to the tail, while it sound "clean"    (unless you run it externally on the skin- yuk! )  the number of    bulkheads and spar web you would need to transverses makes it a complicated    task. 

    

   Under the cowl you might use a modified Yak 52 system.  The oil tank    would need to modified with a oil pick up point on the top of the tank    somewhere and a ball slid tube and "T" inserted in the feed line    somewhere.

    

   All this is a do able project, which I contemplated at length one    time.  My decision not to, was based on the only 4 facts as I SEE    them.

    

   1. The CJ is not a good design (was not meant to be) for extended    inverted flight.

   2. I do not do extended inverted flight.

   3. The short inverted flight that I do - do, not that much oil goes    overboard.

   4. I rather spend the money on petrol.

    

   BTAIM, that is the great thing our airplanes in the Experimental /    Exposition cat.  We can carry out our dreams and ideas to make    a better mouse trap or at least one that has our mark on it.     Me? I put on a gas machine gun and bomb shackles that work.  (Plus I    have a neat looking gun sight) 

    

   Jim "Pappy" Goolsby  (Well I'm off to Power Plant ground    school.  Maybe at 71 I'm ready for it)

    

    

    

    

      In a message dated 6/23/2011 10:39:55 P.M. Eastern Daylight Time, keith.mckinley(at)townisp.com (keith.mckinley(at)townisp.com)    writes:

    	  Quote: 	
		  -->      Yak-List message posted by: "keithmckinley" <keith.mckinley(at)townisp.com (keith.mckinley(at)townisp.com)>



I'm      curious if anyone has any experience with the following on a CJ:



1. A      "closed" cowling mod like the one on Hal Morely's CJ with some sort of rear      louvers.



2. An inverted oil tank system or taking the stock tank vent      and running it to the rear of the airplane.



Thank you,



Keith      McKinley



--------

Keith      McKinley

700HS

KFIT





Read this topic online      here:



http://forums.matronics.com/viewtopic.php?p=343958#343958======================

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