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BLAST TUBES FOR THE MAGS

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dlm46007(at)cox.net
Guest

Posted: Thu Dec 06, 2007 9:35 am Post subject: BLAST TUBES FOR THE MAGS

I may have ask this  question before but are any using the blast tubes in the baffling to cool the  mags. never had these on a certified or experimental; never  needed.

    [quote][b]

Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Thu Dec 06, 2007 10:05 am Post subject: BLAST TUBES FOR THE MAGS

I put one in....don't know if it's useful or not.



Tim Olson - RV-10 N104CD - Flying

do not archive

David McNeill wrote:

 	  Quote: 	
		   I may have ask this question before but are any using the blast tubes in 

 the baffling to cool the mags. never had these on a certified or 

 experimental; never needed.

 

 *

jesse(at)saintaviation.co
Guest

Posted: Thu Dec 06, 2007 11:12 am Post subject: BLAST TUBES FOR THE MAGS

same here



Jesse Saint

Saint Aviation, Inc.

jesse(at)saintaviation.com

Cell: 352-427-0285

Fax: 815-377-3694



On Dec 6, 2007, at 12:52 PM, Tim Olson wrote:



 	  Quote: 	
		   



 I put one in....don't know if it's useful or not.



 Tim Olson - RV-10 N104CD - Flying

 do not archive

 David McNeill wrote:

> I may have ask this question before but are any using the blast  

> tubes in the baffling to cool the mags. never had these on a  

> certified or experimental; never needed.

> *

Deems Davis

Joined: 09 Jan 2006
Posts: 925

Posted: Thu Dec 06, 2007 11:22 am Post subject: BLAST TUBES FOR THE MAGS

I spoke to Allen Barrett about the need for blast tubes. what I learned 

was that Mags are not fond of heat. In a Pitts,  it is nearly mandatory 

to put in blast tubes as there is a lot of heat behind the baffles, and 

the mags don't last without the tubes. I don't know how much heat the 

-10 holds in the aft engine compartment, but living in the desert, I'm 

sensitive to anything that's affected by the heat, and so I put one in 

for each mag. I used the Van's corrugated plastic tube, and wrapped each 

with a coil of #10 coper wire to bend/aim them at the mags. However, 

based on what I learned in the paragraph below, I believe this is going 

to be too much and I may fashion some restrictors that provide a smaller 

diameter opening. I saw Allen Judy's highly modified RV6 (at) OSH this year 

and he's got blast tubes of a very small diameter Scat Tube ( 3/8"?)



On a related note, I recently spoke with a -10 builder in OK who just 

completed his plane and is now flying. He reported the HTS (Hot Tunnel 

Syndrome) phenomena. He has John Forsling exhaust and the Forsling 

Ceramic coated heat muffs. One mounted on each side of the engine on the 

exhaust stacks. John warned us that the heat muffs might not produce 

enough heat as the exhaust is ceramic coated both inside and outside. 

That turned out NOT to be the case. The air to the muffs is fed by a 

single 2" opening at the rear baffle behind cyl #5.  The solution to the 

heat problem for this builder was to put a restrictor plate in front of 

the 2" air inlet. He experimented with how big the hole in the 

restrictor plate should be and FOUND THAT 1/4 " ONE QUARTER OF AN INCH 

was all that was needed to supply all the air He needed for front and 

aft cabin on a 40 degree OAT day!!!!! It solved his HTS problem and 

still provided all of the heat he needs.



Deems Davis # 406

'Its all done....Its just not put together'

http://deemsrv10.com/

David McNeill wrote:

 	  Quote: 	
		   I may have ask this question before but are any using the blast tubes 

 in the baffling to cool the mags. never had these on a certified or 

 experimental; never needed.

n223rv(at)wolflakeairport
Guest

Posted: Thu Dec 06, 2007 11:44 am Post subject: BLAST TUBES FOR THE MAGS

I have one too



--

jesse(at)saintaviation.co
Guest

Posted: Thu Dec 06, 2007 12:05 pm Post subject: BLAST TUBES FOR THE MAGS

Very good real life example of a fix for HTS.  Anybody else with HTS  

want to try covering the holes and seeing what happens?  One thing I  

know from experience is that I have never seen the heater valves  

opened very far.  You will cook yourself if you do.

Jesse Saint

Saint Aviation, Inc.

jesse(at)saintaviation.com

Cell: 352-427-0285

Fax: 815-377-3694

On Dec 6, 2007, at 1:45 PM, Deems Davis wrote:

 	  Quote: 	

 I spoke to Allen Barrett about the need for blast tubes. what I  

 learned was that Mags are not fond of heat. In a Pitts,  it is  

 nearly mandatory to put in blast tubes as there is a lot of heat  

 behind the baffles, and the mags don't last without the tubes. I  

 don't know how much heat the -10 holds in the aft engine  

 compartment, but living in the desert, I'm sensitive to anything  

 that's affected by the heat, and so I put one in for each mag. I  

 used the Van's corrugated plastic tube, and wrapped each with a coil  

 of #10 coper wire to bend/aim them at the mags. However, based on  

 what I learned in the paragraph below, I believe this is going to be  

 too much and I may fashion some restrictors that provide a smaller  

 diameter opening. I saw Allen Judy's highly modified RV6 (at) OSH this  

 year and he's got blast tubes of a very small diameter Scat Tube  

 ( 3/8"?)

 On a related note, I recently spoke with a -10 builder in OK who  

 just completed his plane and is now flying. He reported the HTS (Hot  

 Tunnel Syndrome) phenomena. He has John Forsling exhaust and the  

 Forsling Ceramic coated heat muffs. One mounted on each side of the  

 engine on the exhaust stacks. John warned us that the heat muffs  

 might not produce enough heat as the exhaust is ceramic coated both  

 inside and outside. That turned out NOT to be the case. The air to  

 the muffs is fed by a single 2" opening at the rear baffle behind  

 cyl #5.  The solution to the heat problem for this builder was to  

 put a restrictor plate in front of the 2" air inlet. He experimented  

 with how big the hole in the restrictor plate should be and FOUND  

 THAT 1/4 " ONE QUARTER OF AN INCH was all that was needed to supply  

 all the air He needed for front and aft cabin on a 40 degree OAT  

 day!!!!! It solved his HTS problem and still provided all of the  

 heat he needs.

 Deems Davis # 406

 'Its all done....Its just not put together'

 http://deemsrv10.com/

 David McNeill wrote:

> I may have ask this question before but are any using the blast  

> tubes in the baffling to cool the mags. never had these on a  

> certified or experimental; never needed.

speckter(at)comcast.net
Guest

Posted: Thu Dec 06, 2007 1:08 pm Post subject: BLAST TUBES FOR THE MAGS

I wonder what size hole you need for a -10 Minnesota day?

  

 Gary

 Back in MN for the holidays

  

 [quote]-------------- Original message -------------- 

From: Deems Davis <deemsdavis(at)cox.net> 



[quote] --> RV10-List message posted by: Deems Davis 

 

 I spoke to Allen Barrett about the need for blast tubes. what I learned 

 was that Mags are not fond of heat. In a Pitts, it is nearly mandatory 

 to put in blast tubes as there is a lot of heat behind the baffles, and 

 the mags don't last without the tubes. I don't know how much heat the 

 -10 holds in the aft engine compartment, but living in the desert, I'm 

 sensitive to anything that's affected by the heat, and so I put one in 

 for each mag. I used the Van's corrugated plastic tube, and wrapped each 

 with a coil of #10 coper wire to bend/aim them at the mags. However, 

 based on what I learned in the paragraph below, I believe this is   going  

 to be too much and I may fashion some restrictors that provide a smaller 

 diameter opening. I saw Allen Judy's highly modified RV6 (at) OSH this year 

 and he's got blast tubes of a very small diameter Scat Tube ( 3/8"?) 

 

 On a related note, I recently spoke with a -10 builder in OK who just 

 completed his plane and is now flying. He reported the HTS (Hot Tunnel 

 Syndrome) phenomena. He has John Forsling exhaust and the Forsling 

 Ceramic coated heat muffs. One mounted on each side of the engine on the 

 exhaust stacks. John warned us that the heat muffs might not produce 

 enough heat as the exhaust is ceramic coated both inside and outside. 

 That turned out NOT to be the case. The air to the muffs is fed by a 

 single 2" opening at the rear baffle behind cyl #5. The solution to the 

 heat problem for this builder was to put a restrictor plate in front of 

 the 2" air inlet  . He e  > _  ://for  [quote][b]

scottmschmidt(at)yahoo.co
Guest

Posted: Thu Dec 06, 2007 3:09 pm Post subject: BLAST TUBES FOR THE MAGS

I have one mag and one lightspeed and no blast tube. 

Never had a problem yet. Maybe I'll be adding one at the next oil change.  

 

Scott Schmidt



---

msausen

Joined: 25 Oct 2007
Posts: 559
Location: Appleton, WI USA

Posted: Fri Dec 07, 2007 7:16 pm Post subject: BLAST TUBES FOR THE MAGS

Deems,



  Do you know if he had John add the turndown on the pipe end or was he running the straight pipe?



Michael



--

Deems Davis

Joined: 09 Jan 2006
Posts: 925

Posted: Fri Dec 07, 2007 7:48 pm Post subject: BLAST TUBES FOR THE MAGS

Mike, this builder did NOT have the turn downs on the exhaust tips. i 

asked him if he was certain as to the source of the heat, and he felt 

certain it was the heat muffs.



Deems



RV Builder (Michael Sausen) wrote:

 	  Quote: 	
		   



 Deems,



   Do you know if he had John add the turndown on the pipe end or was he running the straight pipe?

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