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Building the Clark Spitfire IX

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Building the Clark Spitfire IX

Old 09-23-2007, 06:50 AM
  #26  
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Default RE: Building the Clark Spitfire IX

Hi Dave, are you in TECOM Villas? Would like to see your Spit one day.

Chris A58.
Old 09-30-2007, 10:22 AM
  #27  
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Default RE: Building the Clark Spitfire IX

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
Old 09-30-2007, 02:42 PM
  #28  
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Default RE: Building the Clark Spitfire IX

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
Old 10-01-2007, 12:25 PM
  #29  
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Default RE: Building the Clark Spitfire IX

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
Old 11-10-2007, 07:11 AM
  #30  
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Default RE: Building the Clark Spitfire IX

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[&o], 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
Old 12-18-2007, 12:06 PM
  #31  
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Default RE: Building the Clark Spitfire IX

Sorry the progress has been slow. Lots of little thing slow me down but here are some pictures.
TR
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Old 04-20-2008, 08:48 AM
  #32  
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Default RE: Building the Clark Spitfire IX

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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Old 04-20-2008, 09:13 AM
  #33  
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Default RE: Building the Clark Spitfire IX

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?..
Old 05-08-2008, 12:19 PM
  #34  
trlambsr
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Default RE: Building the Clark Spitfire IX

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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Old 06-01-2008, 10:32 PM
  #35  
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Default RE: Building the Clark Spitfire IX

Is John still selling airplanes. I've alway's wanted a Clark spit, awesome plane.

-Kelly
Old 06-18-2008, 08:56 AM
  #36  
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Default RE: Building the Clark Spitfire IX

Hi there
just brought a clark spit itĀ“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
Old 07-08-2008, 06:12 PM
  #37  
trlambsr
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Default RE: Building the Clark Spitfire IX

lyer

Who is Inzpan
Old 07-08-2008, 06:24 PM
  #38  
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Default RE: Building the Clark Spitfire IX

http://www.inzpan.com/

inZpan is an outfit in the UK that sells a large number of detailed acessories for scale RC aircraft.

Keep up the good work on the Spit!

I look forward to your updates.

Regards,

Noah
Old 07-09-2008, 07:06 AM
  #39  
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Default RE: Building the Clark Spitfire IX

Hi Guys,

I used to live near John Clark and was over to his shop several times. His main business is producing props for fullsized homebuilt aircaft, so he's not too overly concerned with selling his R\C aircraft. As a matter of fact, after I had been to his shop a couple of times he walked me out to the driveway and opened up a trailer (one that i'd seen sitting in the driveway through some pretty cold & snowy winters) & in this trailer sat his Spit & Hurricane. I'd asked him if he'd flown them recently, he just shrugged and said "no time".

I'm not surprised he's uncompromising with his products (no kit without the engine, moding the wing to be a multi-piece) he seemed to be a man "set in his ways". All in all, after going to his shop 3-4 times & he got to know me, he was a very nice man and showed me his model railroad layout in his house. (he is a man with his irons in many fires)

Good luck on the build!

Chris
Old 07-15-2008, 06:33 PM
  #40  
lyer
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Default RE: Building the Clark Spitfire IX

HI TRLAMBSR
I saw the wonderful pics of the clark wing your building,and decided I would have to copy(highest form of flattery) the flaps you`ve made. Much nicer in scale, and worth the extra effort for the final result. I would like to know if you have any pics of the operating system up close canĀ“t make it out very clearly on the pics also what servos would you recommend for the Spit I brought some Futabas 6.5 kg|cm I think these should be ok.
well keep up the nice work looking forward to more pics and ideas till now itĀ“s truly handy as your way ahead in the build,IĀ“ve only made half a wing till now.
Old 07-15-2008, 06:58 PM
  #41  
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Default RE: Building the Clark Spitfire IX

Lyer
There would be lots of things I would do different. Take one task and let me know what you want.
Like the Flaps. I could write a book on that one alone. many thing I would do different. Have lots of pictures. let me know how you want them.
TR
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Old 07-15-2008, 08:16 PM
  #42  
BobH
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Default RE: Building the Clark Spitfire IX

Your flaps look excellent. Not sure what the full size practice is coupling the inner and outer flaps but your method seems to look pretty good to me. It's going to be one fine looking Spit when it's finished. If you need any help with colors etc. let me know. I have several out of print books on colors and markings 1939-1945 RAF aircraft.
Old 07-18-2008, 07:35 AM
  #43  
lyer
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Default RE: Building the Clark Spitfire IX

Hello TR
Those pics already help a lot the idea of making an aliminium rib for the activating system seems good and simpile iĀ“ll go for that, I was thinking of casting something for that, but your way will work better and quicker
but more pics would allways be more than wellcome,theres allways something that one didnĀ“t think about and seeing something takes the guess work out of it.
anyway thanks for the effort,great to have someone else on the same endevior.
The servos IĀ“m using are Futaba S3050 Digital any good?
cheers
Old 11-05-2008, 09:49 AM
  #44  
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Default RE: Building the Clark Spitfire IX

Hi guys. I'll put my 20 cents worth in (with inflation it has gone up from 2 cents!). I have the skeleton of my Clark Spit made up to the ailerons being finished. There is another guy in the east of Australia that has made a few changes during his construction and interestingly the ailerons was one of them. I emailed John just recently as I have just bought a completed machine that is actually over 10 years old and never flown. Unfortunately it does have the Merlin I in it with the mechanical timing advance spark BUT as I have the Merlin II, I will replace it if the power is not enough after I test fly it. Attached are photo's of the latest mod to the ailerons that John can sell for a price! or you can just make it up yourself. Anyway I have attached some photo's of my new machine as well.

My build so far! http://www.rcuniverse.com/forum/m_44...tm.htm#4449016
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Old 08-27-2020, 10:01 AM
  #45  
CarreraGTSCS
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An old thread I know but can anyone tell me the wing area of the Clark Spitfire? Thanks
Old 08-28-2020, 10:11 AM
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Originally Posted by CarreraGTSCS
An old thread I know but can anyone tell me the wing area of the Clark Spitfire? Thanks
Clark Industries did not publish the wing area of the Spitfire but it's not difficult to put you in the ball park. The full size Spitfire had a WS of 36ft 10 inches which equals 242.1 square feet. The Clark Spitfire is a true 1/4 scale with 112in WS therefore 1/4 of 242.1 square feet is 9.684 square feet. There is 144 square inches in a square foot therefore 9.684 square feet times 144 square inches equals 1394.4 square inches.

The 1/4 scale Clark Spitfire has a 112 inch WS that has an approximate wing area of 9.684 square feet or 1394.4 square inches.

I hope this gives you the information you were looking for?

Roger
Old 08-28-2020, 11:19 AM
  #47  
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Originally Posted by ForcesR
Clark Industries did not publish the wing area of the Spitfire but it's not difficult to put you in the ball park. The full size Spitfire had a WS of 36ft 10 inches which equals 242.1 square feet. The Clark Spitfire is a true 1/4 scale with 112in WS therefore 1/4 of 242.1 square feet is 9.684 square feet. There is 144 square inches in a square foot therefore 9.684 square feet times 144 square inches equals 1394.4 square inches.

The 1/4 scale Clark Spitfire has a 112 inch WS that has an approximate wing area of 9.684 square feet or 1394.4 square inches.

I hope this gives you the information you were looking for?

Roger
Roger,
Thank you. I'm getting a very different value using two other methods. I estimated the area using root and tip chords treating the wing as a trapezoid and I used an online ellipse area calculator. Both methods gave an area for the model as approximately 2100 in sq. I'm not the greatest mathematician but I fear that your number is accurate based on scale accuracy and mine are based on methods using estimates.
Old 08-28-2020, 11:55 AM
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I suppose that a better question would be to ask what are some of the all up weights ready to fly? I have a chance to buy a very nice Clark Spitfire that just needs a bit of refinishing. The weight right now minus only radio gear and motor/tank is 34 lbs. I'm estimating that I can have this in the air at 41 to 44 lbs. I'm concerned only with flying qualities at a given weight. I've seen claims of Mick Reeves 1/4 scale Spitfires come in in the 30 to 35 lbs range.
Old 08-28-2020, 05:45 PM
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Originally Posted by CarreraGTSCS
I suppose that a better question would be to ask what are some of the all up weights ready to fly? I have a chance to buy a very nice Clark Spitfire that just needs a bit of refinishing. The weight right now minus only radio gear and motor/tank is 34 lbs. I'm estimating that I can have this in the air at 41 to 44 lbs. I'm concerned only with flying qualities at a given weight. I've seen claims of Mick Reeves 1/4 scale Spitfires come in in the 30 to 35 lbs range.
There is a flyer here on RCU forms, his current post name is elmshoot. Back in 2013-2014 he went by the name SparkyLawnDart and owned and flew the 1/4 scale Clark Spitfire. He said back then that he really liked it and it flew very well but he ended up selling it for some reason or other. Contact him via PM, he maybe able to provide you with some of the information you are seeking.
Old 08-30-2020, 06:38 PM
  #50  
Chad Veich
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Originally Posted by CarreraGTSCS
I suppose that a better question would be to ask what are some of the all up weights ready to fly? I have a chance to buy a very nice Clark Spitfire that just needs a bit of refinishing. The weight right now minus only radio gear and motor/tank is 34 lbs. I'm estimating that I can have this in the air at 41 to 44 lbs. I'm concerned only with flying qualities at a given weight. I've seen claims of Mick Reeves 1/4 scale Spitfires come in in the 30 to 35 lbs range.

My opinion only, 41-44 pounds for a 1/4 scale Spitfire is well within reason and will fly just fine assuming adequate power to pull it around. Again my opinion only, but a 30-35 pound 1/4 scale Spitfire would be a sailplane. I'm sure it would be fun to fly in calm conditions but in any wind I would prefer more wing loading than that would provide.
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