REFLECTOR: Resolved!: Oil temp issue (and heat in the nose)

Hiroo Umeno humeno at microsoft.com
Tue Jul 10 17:37:09 CDT 2007


I really have no idea how far it needs to extend.  My flight test showed no noticeable effect on my airspeeds and it did cool the oil temp good bit so I am going to keep it where it is until something convinces me to change it.

Hiroo

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Chuck Jensen
Sent: Tuesday, July 10, 2007 11:09 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Resolved!: Oil temp issue (and heat in the nose)

Oh.  I guess it kind of depends on who was there first---perhaps its the Lycs that are "backwards"!    Thanks for the posting on your front cooler outlet fairing.  Do you think it needs to stick out that far to create the low pressure area?

Chuck Jensen

 -----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Hiroo Umeno
Sent: Tuesday, July 10, 2007 1:45 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Resolved!: Oil temp issue (and heat in the nose)
It is actually on the pilot side.  Franklins are "backwards" compared to the Lycons.  So, #6 is the far-aft on the pilot side and #1 is the co-pilot side closest to the firewall.

Hiroo

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Chuck Jensen
Sent: Tuesday, July 10, 2007 10:27 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Resolved!: Oil temp issue (and heat in the nose)

Hiroo,

Did you mean the oil cooler and #6 cylinder was on "co-pilot", not the pilot side as you wrote?  If your #6 is on the pilot side, maybe your engine is installed backwards.  :-)

Chuck Jensen
-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Hiroo Umeno
Sent: Tuesday, July 10, 2007 11:57 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Resolved!: Oil temp issue (and heat in the nose)
I have an arrangement that is more like "Spam Cans" where the entire upper cowl is pressurized through the dual NACAs on top with VGs in front of the inlet.  There are metal baffles around the clusters of cylinders with rubber flap up top that seals the interface with the upper cowl.  I checked to make sure that they are properly folded and not making any gaps that leak air.

One thing I can think of is that the take-off for the rear oil cooler is on the Pilot side and that also is the side with the #6 that sits farthest from the inlet.  Perhaps enough air is being diverted into the oil cooler and not getting far enough back.

I have yet to fabricate the Left-Right isolation baffle someone here has suggested so that may help.  I am also thinking that along with the issue I had with the front oil cooler, if the "out" is more of the problem than the "in".  I am contemplating opening some holes on the bottom of the cowl but that seems rather drastic and permanent.  Unless I can get some definitive data that it would help, I didn't want to go there.

Hiroo

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of John Dibble
Sent: Tuesday, July 10, 2007 6:21 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Resolved!: Oil temp issue (and heat in the nose)

Does your plenum fit tight to the rear side of the #6?  If so, a 1/4-1/2" space may help.

John

Hiroo Umeno wrote:

Now, my #6 still runs fairly hot and that kept me from climbing aggressively or doing any high-performance runs.  Next thing to fix.

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