RE: New CMP 50-sized Corsair  
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RE: New CMP 50-sized Corsair - 3/28/2008 8:53:03 PM   
baronerosso


 

Posts: 26
Joined: 7/29/2004
From: MilanoMilano, ITALY
Status: offline 		Hello there neighbor,

I know that the plan call for 2 degree of right and down thrust, but my firewall have already the right thrust but NO down thrust, I would like to know if other cmpro corsair have not built in down thrust in the firewall, if so I'll use a couple of washer.
Sorry, but I don't understand how you paint your plain, I'm looking a way to protect the paint job done in factory, I'm not worried about the wood parts,I'm worried that the factory paint isn't fuel proof at all

Thanks anyway for your support, I'm going now in my basament to keep building it

(in reply to a@l)
       Post #: 151

RE: New CMP 50-sized Corsair - 3/29/2008 2:08:40 AM   
a@l


 

Posts: 8
Joined: 1/5/2008
From: , SLOVENIA
Status: offline 		Baronerosso, did you figure out the problem? My horizontal line is in the centre, vertical is shifted 4 - 5 mm.

RCPilot wrote:
"Most of your standard trainers and high wing planes have down thrust. The reason is because the wing is on top and creating drag. That drag is pushing back on the leading edge of the wing. Push the leading edge back and the nose of the plane comes up. So, down thrust is usually required.

Most low wing planes are opposite. The drag on the leading edge is pushing the wing back, but since it's on the bottom, that will tend to pull the nose down . Up thrust is needed.

Shoulder wing should come out with zero thrust up or down . "





< Message edited by a@l -- 3/29/2008 11:58:07 AM >

(in reply to baronerosso)
       Post #: 152

RE: New CMP 50-sized Corsair - 3/29/2008 7:14:36 PM   
baronerosso


 

Posts: 26
Joined: 7/29/2004
From: MilanoMilano, ITALY
Status: offline 		Hello there a@l,

I read what rcpilot post, but as you can read as well, the cmpro manual calls fro 2 degrees of down thrust....
I've also read some post about this plane that say to don't fly it without down thrust; I'll keep thinking about it I guess..

Ciao
Luca

(in reply to a@l)
       Post #: 153

RE: New CMP 50-sized Corsair - 4/3/2008 10:26:37 AM   
baronerosso


 

Posts: 26
Joined: 7/29/2004
From: MilanoMilano, ITALY
Status: offline 		Hello there,

I'm having some problem to put the tank inside the plane. seems it wont fit.
Do you have the same problem?
Thanks

(in reply to a@l)
       Post #: 154

RE: New CMP 50-sized Corsair - 4/3/2008 1:00:21 PM   
Larry S



Posts: 443
Joined: 3/3/2004
From: Manteno, IL, USA
Status: offline 		Hi Guys,
I just came across this thread and will give my imput. I had two of these birds. First one was build according to the plans, even balance. Second one was built just a little different and what a difference in flying. PUT that 2 degree down in with the 2 degree right. I used washers to shim. My Corsair flew great with that down thrust. Also don't forget the CG is way off, move it forward or it will be tail heavy.
Larry

(in reply to baronerosso)
       Post #: 155

RE: New CMP 50-sized Corsair - 4/3/2008 3:44:01 PM   
a@l


 

Posts: 8
Joined: 1/5/2008
From: , SLOVENIA
Status: offline 		@ baronerosso - angle to put in is tight, but there is enough space.

@ Larry thanks - can you describe shortly what was the flying diffrence. CG 80 - 85 mm is not good? You "had" them, crashed both?

< Message edited by a@l -- 4/3/2008 3:45:33 PM >

(in reply to Larry S)
       Post #: 156

RE: New CMP 50-sized Corsair - 4/3/2008 6:08:52 PM   
Larry S



Posts: 443
Joined: 3/3/2004
From: Manteno, IL, USA
Status: offline 		Yup,
both went down, sorry to say. First CMP 50 was more or less my test plane. Didn't start out that way but ended up that way. The CG on my first one was according to the plans and it was tail heavy and made it a pain in the butt to land. After bending landing gears and damaging the plane several times, I started to move the CG forward until I found the right place for it. I then decided to build a second CMP 50 Corsair and incorporated everything I learned from the first one. Couple of changes was to put in the 2 degrees of down thrust and move the CG 3" from the leading edge. At those settings the bird flew great. I lost it due to battery failure. I had used a battery cycler to check my batteries and they checked out good. Went to the field, check them again with a meter and everything was ok. On the second flight, I did not recheck them figuring they should have a good charge and half way throught the flight, down it went. When I got the plane back, I checked the batteries again and damn if they weren't down way below the red. All I can think of is that maybe one of them developed a short. My advice on flying this plane is to get your ground speed up before you temp to take off and do a very easy climb out. Actually my plane would life off without much elevator input when it was ready to fly. Be leary of stalls during take offs.
I plan on building another CMP Corsair but next time I'll go with the larger one.
Larry

(in reply to a@l)
       Post #: 157

RE: New CMP 50-sized Corsair - 4/3/2008 9:52:25 PM   
baronerosso


 

Posts: 26
Joined: 7/29/2004
From: MilanoMilano, ITALY
Status: offline 		Hello guys,

thanks for your imput Larry, I think I'll use washer as well for down thrust.
I'm loving building this plane, I'll use an OS70 surpass in it with a glow heater as well, as It call for a lot of weight in the nose I do prefer to put a larger engine and a glow heater as well.
I'm also using clear paint on it to made it fuel proof.
A@l I'm going to try better to fit tank inside then without cut nothing as you say space is already enough.
Thanks
Luca

(in reply to Larry S)
       Post #: 158

RE: New CMP 50-sized Corsair - 4/4/2008 7:04:47 AM   
chistech


 

Posts: 83
Joined: 9/20/2007
From: south dartmouth, MA, USA
Status: offline 		Hello all,
Will this plane fly with a 52 four stroke like it says it will? I have a brand new magnum 52 that has been sitting in it's box and just bought this plane for it. Maybe it is not big enough. How about a os 90 fs? Got one of those too.

Thanks, Ted

(in reply to baronerosso)
       Post #: 159

RE: New CMP 50-sized Corsair - 4/4/2008 5:18:57 PM   
Larry S



Posts: 443
Joined: 3/3/2004
From: Manteno, IL, USA
Status: offline 		Hello again,
On my first Corsair I used an OS 46 and it did fly the plane but only marginal. No room for error. On my second Corsair, I went with an OS 61 and that is the engine to go with. It will fly with a smaller engine but the problem I ran into is take off speed on a grass runway. If the grass was on the high side, the OS 46 had a hard time getting the aircraft rolling fast enough for takeoff. With the OS 61, that pulled the plane very easily. I recommend nothing smaller then a 61 size engine. As for a 4 storker I wouldn't go less then an 80 size motor. Extra power plus you'll need weight in the nose is the way to go.
Larry
PS If you go with a 2 stroke engine, do not mount it inverted like I did. Floods easily and hard to start. I never had a problem with a 4 stroke inverted.

< Message edited by Larry S -- 4/4/2008 5:26:11 PM >

(in reply to chistech)
       Post #: 160

RE: New CMP 50-sized Corsair - 4/4/2008 7:15:35 PM   
a@l


 

Posts: 8
Joined: 1/5/2008
From: , SLOVENIA
Status: offline 		I have Saito 72.



(in reply to Larry S)
       Post #: 161

RE: New CMP 50-sized Corsair - 4/24/2008 5:10:32 AM   
chistech


 

Posts: 83
Joined: 9/20/2007
From: south dartmouth, MA, USA
Status: offline 		Building update on my corsair. I have installed a Thunder Tigre 90 four stroke as it is 3 ounces heavier than an OS. I ended up mounting the thrust washer on the motor at 145 mm instead of the 125 reccomended. That distance will not even put the thrust washer out of the cowling never mind beyond the plastic radial motor. I also changed the rudder linkage by putting a control horn inside the fuse above the tailwheel. I cut a hole in the fuse on the tail wheel door lines and then added a bearing block. I put a brass grommet on the bottom of the fuse and then used the brass tube down from the top into a stringer above where the steering arm is. I used a 1/2a nose wheel steering arm to make the tailwheel wire control horn. I filed a flat on the wire and then used loctite. I used all new clevis' on the surfaces and also used clevis' on the bellcranks for the retracts. I got rid of the 2" wheels and added scale robart 2.75 wheels. These wheels have a narrow profile and fit in the wing flat. The 2.75" wheels just clear the ribs in the retract bay but look and should work much better than what came with it. I also reworked the retracts with loctite and installed small set screws to adjust the up and locked position. The CMP retracts have a lot of play when up and the wheels will hang down when retracted. By putting in the screws it allows you to adjust the up and locked position. No more wheel hang. I used 4-40 allen head bolts and blind nuts instead of the screws to install the retracts also. This sandwiches the retract with the ply and is more secure than just epoxing the mounting blocks in.I am adding 7.4 ounces of lead to the nose to balance at 3". If you are installing retracts I reccomend the JR retract servo because of the high torque. It does take a lot of power to work the mechanism. The Hitech will strip! I have had one strip on a P51 that used alot less effort to function.If the weather is good this weekend it should fly. I'll keep you posted.

(in reply to a@l)
       Post #: 162

RE: New CMP 50-sized Corsair - 4/24/2008 6:14:21 PM   
a@l


 

Posts: 8
Joined: 1/5/2008
From: , SLOVENIA
Status: offline
quote:

ORIGINAL: chistech

I also changed the rudder linkage by putting a control horn inside the fuse above the tailwheel. I cut a hole in the fuse on the tail wheel door lines and then added a bearing block. I put a brass grommet on the bottom of the fuse and then used the brass tube down from the top into a stringer above where the steering arm is. I used a 1/2a nose wheel steering arm to make the tailwheel wire control horn.


That's good and interesting solution. Can you picture that?













(in reply to chistech)
       Post #: 163

RE: New CMP 50-sized Corsair - 4/24/2008 11:50:39 PM   
skrez


 

Posts: 354
Joined: 6/17/2004
From: Mokena, IL, USA
Status: offline 		Hi Guys,
Where can I buy the CMP 50 size Corsair,Do they still make it?
Thanks,
Frank

(in reply to a@l)
       Post #: 164

RE: New CMP 50-sized Corsair - 4/25/2008 4:15:19 AM   
chistech


 

Posts: 83
Joined: 9/20/2007
From: south dartmouth, MA, USA
Status: offline 		I will try and post some pictures soon. I taxied the plane today in the yard. Will need to make adjustments to the throttle servo as full throttle trim only gave me a idle of 2400 and it would stall out after a while. The 90 with a 13-8 really gets this bird moving out fast. I don't think I will lack for a good roll out for take off.The 2.75 wheels are definetly better on the grass than the 2" ones. The tail wheel steering set up is working great so far and gives alot of ground handling. Skrez, I just bought my plane from Nitro Planes. Just go to the web site and order. They got it out fast and with shipping it was just over $150.00. Hope to maybe fly tomorrow, it is supposed to be nice with 5-7 mph winds.

(in reply to skrez)