RE: CMP Hellcat  
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RE: CMP Hellcat - 2/18/2008 5:34:31 PM   
Hot Rod Todd



Posts: 439
Joined: 10/14/2002
From: Cedar Rapids, IA, USA
Status: offline 		Do you mean Hydrolocking? What I do is always turn the engine over by hand first. If it feels tight, do not turn it with the starter. Take out the glow plug and let it drain, then start it. I can't say I have that problem much though with this plane and a Saito 1.20.

(in reply to charlesp)
       Post #: 1951

RE: CMP Hellcat - 2/18/2008 11:53:25 PM   
warks62



Posts: 568
Joined: 12/25/2003
From: Fresno, CA, USA
Status: offline 		Hydrolocking as was explained is basically in a model engine filling the combustion chamber with fuel causing it to lock up. The most common cause of this is the fuel tank being higher than the carburator. Ideally you put the fuel tank at the same level as the carb so no fuel will gravity feed into the carb. If this isn't possible then there are other ways such as a Kline fuel regulator or turning the engine over backwards at first so the fuel gets pushed out of the cylinder up through the carb clearing it out. Then starting it normally.

Randy

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Randy, member of the true 1/6th Royal Corsair Build

(in reply to Shubova)
       Post #: 1952

RE: CMP Hellcat - 2/20/2008 12:20:47 PM   
charlesp


 

Posts: 12
Joined: 8/29/2007
From: Baraboo, WI, USA
Status: offline 		Thx guys hydrolocking is what i was talking about. I just saw somthing on one of the threads about a saito 150 doing that thats why i didnt look at them. Oh and the plane is here now. It looks like im going to have to cover it with sonthing to protect the paing anuone know what i should use? i want to keep ot looking flat so i wont get a shine

(in reply to warks62)
       Post #: 1953

RE: CMP Hellcat - 2/20/2008 1:18:31 PM   
Hot Rod Todd



Posts: 439
Joined: 10/14/2002
From: Cedar Rapids, IA, USA
Status: offline 		I used minwax polyurethane in the gold can (NOT the water based). It is very fuel proof and the spray cans can be found in most stores. The Satin finish is not totally flat but looks good on a warbird. You may get a little yellowing over time, but it does not hurt the look much.



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(in reply to charlesp)
       Post #: 1954

RE: CMP Hellcat - 2/20/2008 5:10:54 PM   
Shubova


 

Posts: 177
Joined: 8/21/2005
From: Upland, CA, USA
Status: offline 		Very good definitions and solutions for the hydro lock problem.
There is one other thing I wanted to mention, if you didn’t already know it. There is difference between the Saito 120 and the Saito 125. The 120 is a very good engine but is no longer made although you can still find them new. The 125 replaced the 120, it is lighter by about 7oz and the HP 2.2 is the same. Also if you compare the Saito 125 to the OS 120 you'll see the Saito 125 is lighter (about 8oz) and is a little more powerful.
Shubova

(in reply to Hot Rod Todd)
       Post #: 1955

RE: CMP Hellcat - 2/20/2008 5:31:47 PM   
Shubova


 

Posts: 177
Joined: 8/21/2005
From: Upland, CA, USA
Status: offline 		Hot Rod Todd,
Did the surfaces crack when you used the polyurethane. There is two types the one you mentioned and spar urethane. I've used both on wood and they both yellow. The spar yellows to almost a golden brown. Anyway let me know about the cracking.
Shubova

(in reply to Shubova)
       Post #: 1956

RE: CMP Hellcat - 2/20/2008 6:21:35 PM   
Hot Rod Todd



Posts: 439
Joined: 10/14/2002
From: Cedar Rapids, IA, USA
Status: offline 		No cracking at all. It is actually very clear when you put it on, it just yellows a bit with age. You only really notice it over areas that are white. I have planes that are three years old and it is holding up great.

(in reply to Shubova)
       Post #: 1957

RE: CMP Hellcat - 2/26/2008 11:24:35 PM   
charlesp


 

Posts: 12
Joined: 8/29/2007
From: Baraboo, WI, USA
Status: offline 		hay guys is there a set of retracts that i can put in this CMP hellcat without having to cut the wing apart. This is my first warbird and I dont want to take on too much, let me know and a link would help a ton thx

(in reply to Hot Rod Todd)
       Post #: 1958

RE: CMP Hellcat - 2/27/2008 12:06:01 AM   
warks62



Posts: 568
Joined: 12/25/2003
From: Fresno, CA, USA
Status: offline 		CharlesP, not that I would trust. It really is not a hard thing to do to beef up that area except for the covering. century Jet is the least out of the bunch for mods all you have to do is add quality ply to the spar due to cutting some of the spar away to clear the strut. In this case the covering is not really effected. With care you could make full mods to the retracts if you want and keep the covering. It all depends on your experiance.

Randy

< Message edited by warks62 -- 2/27/2008 12:10:21 AM >

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Randy, member of the true 1/6th Royal Corsair Build

(in reply to charlesp)
       Post #: 1959

RE: CMP Hellcat - 2/27/2008 3:50:54 AM   
charlesp


 

Posts: 12
Joined: 8/29/2007
From: Baraboo, WI, USA
Status: offline 		Randy thats what i ws afraid of Do u have any pics of what it might look like during the mods. thx

(in reply to warks62)
       Post #: 1960

RE: CMP Hellcat - 2/27/2008 5:46:19 AM   
warks62



Posts: 568
Joined: 12/25/2003
From: Fresno, CA, USA
Status: offline 		I didn't have my camera with me but will bring one home tomorrow night and take pics of one I am building right now and maybe make some sense out of it. The problem but not a bad one is that most of the good retracts are slightly wider than the mount is stock in the wing. Not by much just a little. So you need to widen it. Now if you are recovering the wing or at least the bottom of it or better yet glassing the wing then it is an easy mod. Next when the retract is retracted the spar is in the way of the strut. So you have to make a "U" shape in the spar for the strut to go down into as it crosses the spar. Now that you basically cut half of the spar away you need to beef that back up so it won't break. What I do is take 1/4" ply and cut the "U" shape in it and cut it to the correct size and then use 30 minute epoxy and glue one on each side of the spar making it wider in this area and very strong. Like I said will take pics tomorrow night and it will make sense. Note: if carefull you could do this without screwing up the original covering and just touch it up with some paint and a brush.

Randy

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Randy, member of the true 1/6th Royal Corsair Build

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       Post #: 1961

RE: CMP Hellcat - 2/27/2008 10:03:37 PM   
ffdq


 

Posts: 393
Joined: 10/15/2002
From: RIDGEFIELD, NJ, USA
Status: offline 		hey guys, I have been working on my cat for a few days in a row,and I need to know if there is much diff.between the cmp and the knock off,I have the knock off this time and dont like it much.I have done alot of work on the wings,should I drop it and get a cmp cat or stay with this one?How dose this knock off fly?My frist one was a cmp and it flew very good.
thanks Fred

(in reply to Hot Rod Todd)
       Post #: 1962

RE: CMP Hellcat - 2/27/2008 10:24:35 PM   
ReaperGrim


 

Posts: 128
Joined: 11/28/2007
From: , AL, USA
Status: offline
quote:

ORIGINAL: ffdq

hey guys, I have been working on my cat for a few days in a row,and I need to know if there is much diff.between the cmp and the knock off,I have the knock off this time and dont like it much.I have done alot of work on the wings,should I drop it and get a cmp cat or stay with this one?How dose this knock off fly?My frist one was a cmp and it flew very good.
thanks Fred

Get rid of it, trust me. Its brittle glass work and heavy wood in the wing.

(in reply to ffdq)
       Post #: 1963

RE: CMP Hellcat - 2/27/2008 11:39:19 PM   
warks62



Posts: 568
Joined: 12/25/2003
From: Fresno, CA, USA
Status: offline 		I agree I have seen both side by side and they are not the same quality. I have also seen the fuse back on the stab start cracking on the cheap one.

Randy

< Message edited by warks62 -- 2/27/2008 11:40:04 PM >

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Randy, member of the true 1/6th Royal Corsair Build

(in reply to ReaperGrim)
       Post #: 1964

RE: CMP Hellcat - 2/28/2008 9:29:21 PM