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Removing chinese radio kit from cj6

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Harv

Joined: 01 Jul 2010
Posts: 172

Posted: Sun Apr 24, 2011 12:23 am Post subject: Removing chinese radio kit from cj6

Hi



Could anyone offer some advice on removing the old radio components from a cj6?



I'd like to remove as much of the redundant stuff as possible.



We've pulled out the rear large adf box and rotating head unit and also taken out the coffee grinder style radios but i've drawn a blank as to what components we need to leave for the compass to work correctly?



I'd like to construct a baggage compartment behind the rear seats and yesterday I unbolted the large and heavy unit that is located on the removable shelf directly behind the rear cockpit seat but i'm unsure if this unit is required?



Also can  any of the components that are bolted between the front and rear cockpits be removed?



TIA



Cheers



Harv

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wlannon(at)persona.ca
Guest

Posted: Mon Apr 25, 2011 9:41 am Post subject: Removing chinese radio kit from cj6

Hi Harv;



Everything aft of the rear seat with the exception of the SBL40 Inverter can 

be removed along with associated wiring.

There are no gyro-compass components in that area.



On the shelf between the seats you can remove only one item.  I cant' recall 

the name right now but it is the central item,  a grey box about 4.5" square 

containing some large relays. This and all wiring can go.

 	  Quote: 	
		  From left to right you must retain: --  SBL35 Inverter, TH3 Gyro unit, FL3 

Amplifier,  EX Junction Box and the Power Supply relay Box.
	




But; there could be complications:  If your aircraft was modified to a solid 

state voltage regulator that is also located on that shelf.  Whether that 

installation was done without moving other units I do not know.



Don't throw away anything yet!  If you take the time you will find a number 

of useful items for your spares box.



Cheers;

Walt

---

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talew(at)bellsouth.net
Guest

Posted: Mon Apr 25, 2011 11:24 am Post subject: Removing chinese radio kit from cj6

Walt I have 1965 CJ . The compass sensor is just in front of the rudder .

You don't want to injure those cables .

Terry 



---

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wlannon(at)persona.ca
Guest

Posted: Mon Apr 25, 2011 12:41 pm Post subject: Removing chinese radio kit from cj6

Good point Terry;



On my 1965 and other early ones I have done it is in the LH outer wing.  I 

totally forgot about that change and you are right - so Harv - don't cut 

those!!



Walt



---

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Harv

Joined: 01 Jul 2010
Posts: 172

Posted: Wed Apr 27, 2011 2:36 pm Post subject: Re: Removing chinese radio kit from cj6

Thanks for the info,



I should have said my Cj is a 1988 model



Since my post i've had a good look through the parts manuals and It appears something to do with the gyro compass is mounted up high in the tail just forward of the rear fin, I think this is what was just mentioned,



A separate post indicated some form of voltage regulation might be mounted between the cockpits and i'm almost certain there is an inverter mounted there and an identical one mounted in the tail. My guess would be the one in the tail used to supply the adf antenna / radio receiver and the one between the cockpits serves the instruments.



Hopefully I can identify and remove much of this, it weighs one hell of a lot! (Avgas is too expensive to give it a free ride  )



Rgs



Harv

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Adrian Coop Cooper

Joined: 02 Feb 2010
Posts: 37
Location: Vancouver, BC

Posted: Wed Apr 27, 2011 4:26 pm Post subject: Re: Removing chinese radio kit from cj6

Harv.

Mine is a 1988 as well. However, mine has a mechanical voltage regulator behind the firewall whilst my Buddies (same batch) has an electronic voltage regulator on the shelf between cockpits which I suspect was an air force installed mod.

I did manage to remove 166lbs of surplus wiring and tube radios including the complete ADF system. However, I did keep the Magnuson type compass in both panels which requires that remote system with the little window just before the tail. It is a very nice feature as you can use it as a bug ... sort of like a very poor man's RMI. I also kept the inverters and the nice electric DGs

So be careful not to remove something you might still like to have. My electrical Guru did a great job rewiring and I am running two King 196 VHFs a Garmin TX and a self enclosed Narco ILS all very nice and of course light weight. Once the ADF antenna and box is removed you can re-configure. Some folk modify the ADF box for tool and spare oil storage.  Perhaps, a better alternative is to remove the ADF box's shelf aft and reconfigure as the battery (batteries 2x12v, modern, sealed, which will fit in the existing box) shelf. That then gives loads of room for a secure luggage area. This you can ensure is sealed to prevent FOD making its way back to cables and pulleys and still have a port and starboard access door as well as access from behind the rear seat. NB, the starboard access door is smaller than the one on the port side, so plan accordingly. This then leaves you the large removable panel on the starboard side, not only can you have the battery(s) there but it might be a good spot for a smoke tank. Of course this is all CofG and weight and balance dependent. I agree about not carrying excess weight at today's horrendous fuel prices. Be safe and good luck. Coop.

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_________________
Coop

wlannon(at)persona.ca
Guest

Posted: Wed Apr 27, 2011 7:22 pm Post subject: Removing chinese radio kit from cj6

Hi Harv;



That is the actual magnetic compass for the Gyro Compass system.  On the 

very early aircraft like mine it was mounted near the LH wing tip.

Later moved to the better location in the aft fuselage as you described.



If installed (it is a military modification) the solid state voltage 

regulator is mounted behind the rear seat either on the shelf or below that 

on the front spar.  I think Joe Howse was correct that it is on the spar.

You may or may not have that.  The normal regulator is on the aft, upper, RH 

side of frame #1.



There are two necessary inverters.  Refer to my previous post.  There is a 

third one (for the ADF) located immediately behind the rear seat with all of 

the comm radio, radio compass(ADF) and interphone system that you can 

totally remove.



You bet it is heavy.  With all associated parts and wiring you can remove 

approx. 195 lbs. Of course you will later have to install some ballast to 

compensate for it.



regards;

Walt



---

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wlannon(at)persona.ca
Guest

Posted: Wed Apr 27, 2011 7:30 pm Post subject: Removing chinese radio kit from cj6

Harv;

I should read before sending rather than after----- Referring to the solid 

state voltage regulator I wrote "rear seat".  Should have been front seat.

Walt

---

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tigeryak18t

Joined: 26 Sep 2009
Posts: 233
Location: PARIS FRANCE

Posted: Thu Apr 28, 2011 12:31 am Post subject: Removing chinese radio kit from cj6

I had a warning from the Yak russian people concerning all these mod on Yak's.



BEWARE OF THE EFFECT OF NEW MASS REPARTITION



All these devices had been taken in account when testing the plane.

Change in repartition could have a very bad effect on the inverted spin recovery.

  

No other comments....

Didier



2011/4/28 Adrian Coop Cooper <cooperairracing(at)gmail.com (cooperairracing(at)gmail.com)>

  	  Quote: 	
		   --> Yak-List message posted by: "Adrian Coop Cooper" <cooperairracing(at)gmail.com (cooperairracing(at)gmail.com)>

 

 Harv.

 Mine is a 1988 as well. However, mine has a mechanical voltage regulator behind the firewall whilst my Buddies (same batch) has an electronic voltage regulator on the shelf between cockpits which I suspect was an air force installed mod.

   I did manage to remove 166lbs of surplus wiring and tube radios including the complete ADF system. However, I did keep the Magnuson type compass in both panels which requires that remote system with the little window just before the tail. It is a very nice feature as you can use it as a bug ... sort of like a very poor man's RMI. I also kept the inverters and the nice electric DGs

   So be careful not to remove something you might still like to have. My electrical Guru did a great job rewiring and I am running two King 196 VHFs a Garmin TX and a self enclosed Narco ILS all very nice and of course light weight. Once the ADF antenna and box is removed you can re-configure. Some folk modify the ADF box for tool and spare oil storage.  Perhaps, a better alternative is to remove the ADF box's shelf aft and reconfigure as the battery (batteries 2x12v, modern, sealed, which will fit in the existing box) shelf. That then gives loads of room for a secure luggage area. This you can ensure is sealed to prevent FOD making its way back to cables and pulleys and still have a port and starboard access door as well as access from behind the rear seat. NB, the starboard access door is smaller than the one on the port side, so plan accordingly. This then leaves you the large removable panel on the starboard side, not only can you have the battery(s) there but it might be !

    a good spot for a smoke tank. Of course this is all CofG and weight and balance dependent. I agree about not carrying excess weight at today's horrendous fuel prices. Be safe and good luck. Coop.

 

 --------

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-- 

Didier BLOUZARD

didier.blouzard(at)gmail.com (didier.blouzard(at)gmail.com)

0624243672

  [quote][b]

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