RE: Building the Clark Spitfire IX

RE: Building the Clark Spitfire IX
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RE: Building the Clark Spitfire IX - 9/23/2007 12:50:30 PM

Posts: 94
Joined: 10/23/2004
From: Derby, UNITED KINGDOM
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Hi Dave, are you in TECOM Villas? Would like to see your Spit one day.

Chris A58.

(in reply to Dave in UAE)

RE: Building the Clark Spitfire IX - 9/30/2007 4:22:10 PM

Posts: 44
Joined: 1/1/2002
From: Bethesda, MD, USA
Status: offline

Dave
I have not gotten to the Fuse yet but something really concerns me. I am worried that there is not enough air getting to the engine. There are many P 51's in our club and the inline engines are cooking the rear cylinder. How does the Clark engine do if built per plans. Also a lot of talk at topgun about this problem and in fact someone put a fan on the rear cylinder.
TR

(in reply to Dave in UAE)

RE: Building the Clark Spitfire IX - 9/30/2007 8:42:45 PM

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Joined: 4/16/2002
From: Mount Dora, FL, USA
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I have seen the Clark fly as per plans with only a small hole cut in the front of the cowl. The air to the back cylinder works well and the air exits around the Exhaust stacks. I am going with that setup. By the way that was my Mustang at top gun. The reasons for its cooling issues are different. One being that the 150 twinspark was very tight in that cowl. The Clark Merlin has more room and lots of exhaust area. That combined with the rear ducting leads me to believe that it will work fine. If I build my other Mustang or if I redo my Top Gun plane I will do the cooling the same way as the Clark.
Good Luck
Paul

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In this world, Elwood, you must be oh so smart or oh so pleasant
Well, for years I was smart. I recommend pleasant

(in reply to trlambsr)

RE: Building the Clark Spitfire IX - 10/1/2007 6:25:01 PM

Posts: 33
Joined: 10/21/2003
From: Dubai, UNITED ARAB EMIRATES
Status: offline

Hello Gents

Yes Chris I am in B22, you can probably hear me doing my runs. The wing is sitting in the corner of the shop waiting for the cooler weather so I can take it outside and finish it off, so I am just working on the fuselage formers which are all over-sized. John has some concerns about this as it was never an issue in the past, I think when he gets back from the UK (funeral for the Hurricane pilot) he was going to look into it with his CNC guys.

As for the cooling issues, the prototype has more than 100 flights without an issue. The ram air being forced through the scoop into the cowling is a good size and there is a small opening for the rear cylinder, at least on the Mk V cowl I have, that will provide cooling flow.

I have the 24 x 12 prop back on now and will give it a run tomorrow, so we'll see what results I can get.

I wonder if John will do an update, before he retires in 6 years time, to the Clark Merlin. I came across this site for an in-line twin:

http://www.aero-sports.com/airhobbies/new.html

Take Care

Dave

(in reply to dragoonpvw)

RE: Building the Clark Spitfire IX - 11/10/2007 12:11:41 PM

Posts: 33
Joined: 10/21/2003
From: Dubai, UNITED ARAB EMIRATES
Status: offline

Just a quick question for the guys running these engines, have any of you experienced the seepage of oil from via all the crankcase joints during your bench runs. I have tightened all the bolts and am still seeing a fair amount of oil after each engine run. It collects along the lip at the bottom of each crankcase half on both sides. John is the obvious man to ask but he isn't returning my e-mails anymore

, so I pose the question to the masses

If this is normal then please ignore but I asked John about this when I was home last year and he didn't seem to think that was normal. I know all the joints are coated with a sealant before John tightens everything up. I have black residue as well but that is from a pin-hole in the weld of the exhaust for the rear cylinder.

Switched back to the 24" prop but my battery died on my rpm gauge so no clear indications as to what the max rpm was. Ran it through a full 10 minute flight sequence I have worked out (in my head like the Blue Angels guys do) with aeros, touch and goes, aborted landings and she never missed a beat, hopefuly it stays that way, granted you can't replace the air-loads or the panicky guy on the transmitter buttons, but so far so good.

Dave

(in reply to Dave in UAE)

RE: Building the Clark Spitfire IX - 12/18/2007 5:06:52 PM

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Joined: 1/1/2002
From: Bethesda, MD, USA
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Sorry the progress has been slow. Lots of little thing slow me down but here are some pictures.
TR

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< Message edited by trlambsr -- 12/18/2007 5:09:06 PM >

(in reply to Dave in UAE)

RE: Building the Clark Spitfire IX - 4/20/2008 2:48:34 PM

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Joined: 1/1/2002
From: Bethesda, MD, USA
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more Photos
I made a reverse jig to make sure when sheeting the bottom it would be right. After finishing the wings they are perfect to specs.

TR

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< Message edited by trlambsr -- 4/21/2008 4:22:26 PM >

(in reply to Dave in UAE)

RE: Building the Clark Spitfire IX - 4/20/2008 3:13:06 PM

BobH

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Joined: 4/1/2003
From: Springfield, VA,
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Looks really really good. The only Clark Spit I've ever seen was at WOD several years ago. The builder never flew the plane and ended up selling it. You must fly at DCRC?..

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BobH.

(in reply to trlambsr)

RE: Building the Clark Spitfire IX - 5/8/2008 6:19:33 PM

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Joined: 1/1/2002
From: Bethesda, MD, USA
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Decided to replace the servos for the flaps with Jr9s791 low profile retract servos. I could not get the flaps to close completely and open to 85 degrees. These servos really work well.
TR

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< Message edited by trlambsr -- 5/8/2008 6:23:32 PM >

(in reply to trlambsr)

RE: Building the Clark Spitfire IX - 6/2/2008 4:32:50 AM

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Joined: 1/9/2002
From: Ocala, FL, USA
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Is John still selling airplanes. I've alway's wanted a Clark spit, awesome plane.

-Kelly

(in reply to trlambsr)

RE: Building the Clark Spitfire IX - 6/18/2008 2:56:45 PM

lyer

Posts: 1
Joined: 1/29/2008
From: sintra, PORTUGAL
Status: offline

Hi there
just brought a clark spit it´s flying as we speak (type)should be arriving soon, and just saw your posts,nice looking work there.will look forward to picking your brains as time goes on.if thats allright. first the big unrapping of the rather large parcel though.That should answer the question if John is still selling spits:anyway keep the pics coming they look great.Any pics of cockpit;Inzpan do a nice looking panel and have a new cockpit .
cheers

(in reply to RightThrust)

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