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CMP Zero 80" 50 cc model

Old 07-29-2008, 08:28 PM
  #1  
Gonzalo38
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Default CMP Zero 80" 50 cc model

I just purchased a CMP Zero 80" 50 cc model. The engine is a DL 50 with a Pitts style muffler



http://www.cmpairplane.com/warbird/Z...gasengine.html

I have several questions and I would appreciate your help.

- Retracts: I want to replace the fixed landing gear with some retracts. Anybody knows which retracts would fit this plane ?

- Servos: I want to use Futaba servos. Any suggestions on which servos to choose ? Recommend torque ?

- Cockpit: Have anybody seen a company doing a cockpit that would fit this model ?

I wonder if this Sierra retracts would fit

http://www.sierraprecision.com/prod35.html



They are supposed to have 85 degrees for scale angles.

It looks like http://www.shindinmachine.com could have a set also (that would require some minor wing modification)

Robart has a 90º one... http://www.robart.com/retracts/drawings/153.pdf

Century Jet has a retract system that is supposed to fit perfectly http://www.centuryjet.com/webstore/m...roduct_ID=1178
Old 07-29-2008, 10:19 PM
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starcop
 
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Default RE: CMP Zero 80" 50 cc model

Hey Gonzalo38, One thing I know about this plane; I owned one about a year ago, I tried everything to balance the plane. Check and re-check and make sure the plans are correct where they tell you the C.G is. I almost crashed mine, maiden flight do to tail dropping like riding a roller coaster. So I re-checked from what the instructions said was the C.G line. I added more nose weight and still the same thing. I ended up the second time putting the plane nose first from about 100 feet straight up. So they are tail heavy, and the instructions are wrong about the C.G. I think I still have my old plans, I could look and see if they changed it. Good luck; other people say there's fly fine, so it was just a C.G issue with mine. starcop
Old 07-29-2008, 10:28 PM
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Gonzalo38
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Default RE: CMP Zero 80" 50 cc model

Starcop:

Thanks for the CG tip. I will make sure to take a close look at that and maybe I will ask somebody with really good fingers to do the maiden flight.....
Old 07-29-2008, 11:29 PM
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Default RE: CMP Zero 80" 50 cc model

Here are my tips on this plane......
Do not put the servos in the tail like shown. You need to put everything as far forward as possible. A friend of mine just finished one of these and with the servos all the way forward two battery packs a Brison 3.2 up front it still needed 2 lbs of lead. As far as retracts he used the Robart 633 which came with 1/2" struts and worked out great. He did have to modify the retract area due to if you notice that they are designed for a wire strut that is bent just after the retract rails. It was an easy mod just use your head and you will see what to do. Plane flies great no bad habits. As far as cockpit Dynamic Balsa has one for the 1/5th size which would be a bit big but might work with a bit of work. You could order one from Yellow Aircraft there Zero is the same size. Just remember the most important thing is keep the weight as far forward as possible. Servos you just can not go wrong with Hitec 645MG they are very strong and Tower has them at a good prive. Servo City also has them.
Old 07-30-2008, 06:12 AM
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Default RE: CMP Zero 80" 50 cc model

Gonzalo.

Good luck with your build! Keep us posted as you progress. This zero is a fantastic flyer...i'm going on a third season with mine. Here are a couple of tips i would consider if i were to do it all over again.

-Don't use the hardware supplied..its all metric stuff....just go buy you some 4-40 stuff, then get some robart hinges (the ones supplied are of cheap material)
-If you are using a 50cc gaser..re-inforce the back side of the firewall with some cloth..especially where the vents are on the forward side fuse...the glass is very thin in that area
-Don't use the supplied cowling ring mount...it will eventually delaminate itself and cause pain and suffering down the road...just go get you some nice aircraft ply..trace the patern out, and make your own.
-If you are going to use your own retracts..tear out the gear rails..they are pretty soft wood...re-inforce that area with cloth and some better quality wood.

Other than that..i built the airplane just how they had it set up...with the servos in the back as well...i had the same CG problem as mentioned before..i moved the CG about a half inch or so forward....seems to fly right on now. You won't have to worry about weight...mine came in at about 20 lbs...and i glassed and painted the entire thing...not to mention mine has a 40cc in it..flys it very well. Anyways good luck! and take a look at this thread i started last year concerning the zero..hopefully it will help!

Bubs

http://www.rcuniverse.com/forum/m_64...tm.htm#6485074
Old 03-07-2011, 07:58 PM
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Default RE: CMP Zero 80

my cmp zero
Old 03-08-2011, 08:50 AM
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Default RE: CMP Zero 80

warks62 is on the mark.. i think he was refering to either my first Zero or matt's Zero or a mix of both.. anyways , here is a link for my build, there you will find good reference photos for the gear location and so on.. good luck..

they fly like a baby

http://www.rcuniverse.com/forum/m_90...tm.htm#9080616
Old 01-17-2013, 08:47 AM
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Default RE: CMP Zero 80

What size and type struts would be recommended I'f I plan not to go with retracts ?
Old 01-17-2013, 11:39 AM
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Default RE: CMP Zero 80


ORIGINAL: Gonzalo38

I just purchased a CMP Zero 80" 50 cc model. The engine is a DL 50 with a Pitts style muffler



http://www.cmpairplane.com/warbird/Z...gasengine.html

I have several questions and I would appreciate your help.

- Retracts: I want to replace the fixed landing gear with some retracts. Anybody knows which retracts would fit this plane ?

- Servos: I want to use Futaba servos. Any suggestions on which servos to choose ? Recommend torque ?

- Cockpit: Have anybody seen a company doing a cockpit that would fit this model ?

I wonder if this Sierra retracts would fit

http://www.sierraprecision.com/prod35.html



They are supposed to have 85 degrees for scale angles.

It looks like http://www.shindinmachine.com could have a set also (that would require some minor wing modification)

Robart has a 90º one... http://www.robart.com/retracts/drawings/153.pdf

Century Jet has a retract system that is supposed to fit perfectly http://www.centuryjet.com/webstore/m...roduct_ID=1178
Centruy Jet makes drop in retracts. I use them on this plane and they are great.
Old 01-17-2013, 11:44 AM
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Default RE: CMP Zero 80

Well after asking the same question like six times, I'm sure someone will have an answer....
Old 01-17-2013, 12:23 PM
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Default RE: CMP Zero 80

Here's my suggestion:

http://www.hobbyking.com/hobbyking/s...Class_2pc.html

Make up a mounting block from hardwood and install them into the block in place of the factory retract.

Hopefully this will stop the Zombification of posts that are long dead.
Old 02-25-2013, 10:00 AM
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jstanton
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Default RE: CMP Zero 80

I need the dimensions of the cowl for this plane. I crashed mine last year and the poor cowl was a total loss. I have a good friend that works with fiberglass and he said if I can get the total dimensions of the cowl he would mold me a much stronger cowl. I need to know the total inside width and the total length. We are making a 3/4" plywood firewall and fiberglassing the whole front of the fuselage from the inside for added strength The plane needs so much nose weight to balance we dicided to stenghten the whole front of the fuselage.
Old 02-25-2013, 12:38 PM
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Default RE: CMP Zero 80

Hello Gonzalo, which CMP Zero you have, 1800 mm wingspan or 2100 mm wingspan?

On my big CMP Zero (2100 mm wingspan) I put Robatr 635 gears. http://www.nsmodelers.rs/warbirds/zero/zero-upgrade

Model have at the end 12 kg, if I remember right I need to add 1,2 kg lead!!! Of course, all servos and everything was as forward as possible. Engine was G 45.
Don't worry about weight, Zero fly like a dream...

http://www.nsmodelers.rs/warbirds/zero

Best regards

Mirce
Old 02-25-2013, 12:49 PM
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jstanton
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Default RE: CMP Zero 80

Mirce,

I have the 2100mm Zero like you. Can you please messure your Cowl and give me the dimensions. I need to build me a new cowl and my other one is distroied. Thank You
Old 02-25-2013, 02:01 PM
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Default RE: CMP Zero 80

Hello Jim, I'm sorry, I can't, because I sell my model two years ago...

Regards

Mirce
Old 02-25-2013, 02:09 PM
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Default RE: CMP Zero 80


ORIGINAL: jstanton

Mirce,

I have the 2100mm Zero like you. Can you please messure your Cowl and give me the dimensions. I need to build me a new cowl and my other one is distroied. Thank You

Hi Jim,
I will messure for you it on this Friday. Now I´m not at home, so I can´t. I also have CMP Zero 2100mm, it´s not problem for me.
Old 02-25-2013, 03:12 PM
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Default RE: CMP Zero 80

Prekin,

Thank you so very much for your help. Looking forward to hearing from you. The Polikarpov I-16 is almost ready just waiting for good weather.
Old 02-26-2013, 08:52 AM
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Default RE: CMP Zero 80

So where are some picture of I-16. I´m looking forward to see them!
Old 02-26-2013, 08:56 AM
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Default RE: CMP Zero 80

Here are the latest pictures but I think you my have already seen them. I think it will be another month before I can do the maiden flight. The weather here is really windy and damp this time of year.[:@]



Old 02-26-2013, 08:58 AM
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Default RE: CMP Zero 80

Sorry forgot the pic's. here they are.

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Old 02-26-2013, 09:09 AM
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Default RE: CMP Zero 80

Yes, you are right, I´ve just seen them, but they are still very nice! Maybe, your weather is bether then the weather here. Now here is something between the snow and total "sh*ts". Three day ago here fall down more than 10cm of the snow, but today the temperature was up to 7°C. Two weeks ago was snowy weather for 4 day and after them was the weekly average tempereture about 5°C and rainy weather.
So what I can do? Close the door in my workshop and do the progress on the projects.
I hope, you understand me. This article was very difficult for english writing. []
Old 02-26-2013, 09:18 AM
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Default RE: CMP Zero 80

Prekin,

Yes I understand you very well and I know what you are saying about the weather. Here in Tennessee we do not get very much snow but we do get a lot of cold wind out of Canada the comes down the Mississippi river valley. It brings a cold rain when it blows. Then the next day we get warm weather out of the south fron the guld of Mexico and when the cold are get together with the warm are we have very windy days wlong with rain and even a Tornado once in a while.[:'(] I will have to wait for spring to get hear beofr I think I will be able to fly the Rata. i too am working on other project in my workshop ring now. One is the rebuilding of my CMP Zero. I really like the way that Zero fly's. Have a nice day and agian I thnk You for your help with the messurements of the Cowl for the Zero. I wish I could communicate with you in your native tong.
Old 02-26-2013, 09:43 AM
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Prekin
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Default RE: CMP Zero 80

We can say, you have very similar situation with the weather. Instead of the snow, you have rain
I´m very fear my CMP Zero, because the weight is about 11000 g. My ESM La-7 now I´m remakeing into La-5 FN, was 7700 g. []
You can try to speak my language. But, when I spent one month in the England, I wans´t able to teach my host family some basic phrases. Czech language is difficult for western states.

I have Rata and it is really nice warbird. (Já) Mám Ratu a je to velmi hezká st*hačka. ((Ja) Mam Ratu a je to velmi hezka stihacka)
Y меня есть Paтa, это очень краси́вый истребитель. (In the Russian)
Old 02-26-2013, 09:51 AM
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Default RE: CMP Zero 80

Yes it is a very nice fighter. It reminds me of a Gee Bee R2. I hope I get this right in Czech language .

Ano, je to velmi pěkný bojovn*k. I mi připom*ná Gee Bee R2
Old 02-26-2013, 10:03 AM
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Default RE: CMP Zero 80

Prekin,

I am sure your Zero will fly really good at 11000 grams. My CMP Zero came out at 9500 grams and flew really well at that weight with a 46cc gas engine and a 20x10 prop. Did you get the ESM landing gear for your LA-7? That is the landing gear I am using form my CMP Zero and it works really well. Did you put all of your servo's in the fuselage.? I had all of my servo's as far forward as I could get them and mounted all of my batteries in the cowl with the engine. I still had to add another 900 grams of weight[:'(] to get it to balance at the CG point of 140mm from the leading edge.

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