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extra air

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bvthomas(at)bigpond.com
Guest

Posted: Sun Aug 05, 2007 12:02 am Post subject: extra air

Hi guys,

 can anybody tell me if a second air bottle could be  fitted in series with the existing 11 litre bottle

 in the rear of a 18T, or possibly a larger, say 20  litre bottle.

 My problem is that I can only store 40 Bar and  unless I catch it on the first few blades ( still learning how much priming to  give her) I barely have enough air for a second attempt, and It  occured to me that 40 bar but 20 litres capacity would solve this  problem.

 Also I think I remember reading about somebody  making carbon fibre high pressure 1000psi vessels to replace the Russian units in the USA,can anybody help on this  subject.

 Thanks & regards

 Bruce Thomas

 18T Australia

   [quote][b]

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dsavarese(at)elmore.rr.co
Guest

Posted: Sun Aug 05, 2007 5:34 am Post subject: extra air

Bruce,

 If you're only storing 40 ATM's, the pressure  relief (pop-off valve) is the problem.  Not the size of the tank.   Adjust the pressure relief valve to release at approximately 55 ATM's and it  should shut off at around 50 ATM's.  There is more than enough air in the  existing bottles to start the engine.  Before you hit the start button  though, try putting in 4-6 shots of prime, THEN get out and pull about 4 blades,  putting the prop on a compression stroke.  Then go back inside the  airplane, repressurize the system side, pump 2 more shots of prime, stroke the  throttle 2 full strokes fore and aft and then move the throttle to about 1/4 to  1/3 open.  (Do not touch the throttle again until after it starts.)   Now hit the start button.  The engine will typically start on the  1st or 2nd blade.  Use the primer pump if the engines needs more  fuel.  Do not pump the throttle.

 Dennis

   

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rvfltd(at)televar.com
Guest

Posted: Sun Aug 05, 2007 7:14 am Post subject: extra air

Bruce,

 The short answer is yes, your can place a SCUBA tank in line, many guys here have such a installation.  But the reason they did it is not totally the same as yours.  They did it so they could have air not only for themselves but also for anyone else who might be having problems.  They carry a soft line long enough to reach to a aircraft parked beside them.  

 

 The long answer is there is something wrong with your starting procedure or your equipment.  I can get 5 to 6 start attempts before I am down to the critical point which is about 16 ATMS.  You may have a leak in your air system.  How long will your 40 ATMS last if you just open the main air valve and walk away from the aircraft??  Minimum acceptable is that it should take over night for the air to leak down.  Another thing might be that your QDF-1 valve may be going bad.  The one in my aircraft would not "pop" below 40 ATMS of air pressure.  I changed it out and now it will pop and very slowly try to turn over the engine at 15-16 ATMS of pressure.  The only other thing might be that you have a leak in the start system somewhere.  Check you hose from the QDF-1 start valve to the start spider on the engine.  I am assuming that you have good compression, excessive blow by and leaky valves will cause problems also.   If your timing on the start spider is not correct you just might be loosing air there also, does it turn over properly when you to to start it?  Or is there a lot of air noise in the clys?

 

 Hope all this helps.  I carry the above valves and hoses in stock if you should need them.  I also have all the wheel and brake parts.

 

 Always Yakin,

 Doug Sapp

 

 

 

  Thomas wrote:

 [quote]            Hi guys,

   can anybody tell me if a second air bottle could be fitted in series with the existing 11 litre bottle

   in the rear of a 18T, or possibly a larger, say 20 litre bottle.

   My problem is that I can only store 40 Bar and unless I catch it on the first few blades ( still learning how much priming to give her) I barely have enough air for a second attempt, and It occured to me that 40 bar but 20 litres capacity would solve this problem.

   Also I think I remember reading about somebody making carbon fibre high pressure 1000psi vessels to replace the Russian units in the USA,can anybody help on this subject.

   Thanks & regards

   Bruce Thomas

   18T Australia

    	  Quote: 	
		  

	
 [b]

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