RE: 1/5 scale Bell P-39 Aircobra...  
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RE: 1/5 scale Bell P-39 Aircobra... - 1/8/2006 2:52:44 PM   
Darrell B.



Posts: 375
Joined: 12/22/2003
From: Rogers, AR, USA
Status: offline 		Al,

As for the dual servos on the elevator, I, unfortunately, experienced the failure of a solo elevator servo on a final approach. Let's just say it wasn't pretty. Dual servos here would be a real plus.

Sorry to hear about that. I have also experienced this loss when I was younger and had to rebuild my Skylark on it's maiden flight due to a servo failure. It was a brand new servo too!!


Welding rod would certainly be strong enough but would'n't that be rather heavy?

I would just be using them for the small torque rods in the Hstab/elevator assembly. I will be using carbon fiber pushrods for the run to the servos.


But for most of us, this would be an exercise in frustration when all we really want is a knockout plane to fly on the weekends.

Ditto, This isn't going to be a show plane or a hanger queen. I like to fly all of my airplanes, and they all are workhorses.

Best Regards to all,
Darrell


< Message edited by Darrell B. -- 1/8/2006 2:53:46 PM >

(in reply to rrudytoo)
       Post #: 26

RE: 1/5 scale Bell P-39 Aircobra... - 1/8/2006 5:55:59 PM   
TLH101



Posts: 5439
Joined: 12/27/2001
From: Corpus Christi, TX, USA
Status: offline 		The main problem with the "drive shaft" idea is that the drive shaft of that length will not stand the "impulses" from a single cylinder engine. Or so I have read, I am not an engineer.

_____________________________

Terry
"Old Fart" in training. (not to be an R/Cer, but to be an "Old Fart")

(in reply to rrudytoo)
       Post #: 27

RE: 1/5 scale Bell P-39 Aircobra... - 1/8/2006 6:47:54 PM   
Pelle Gris


 

Posts: 280
Joined: 2/2/2002
From: Billund, DENMARK
Status: offline 		Why not just put the reduction unit near the engine? That way the long shaft for the prop does not spin at high RPM, and should be easier to make. If it only spins at 3-4000rpm I guess the vibrations would be way less.
Take a look at Mick Reeves reduction unit for the G-62. That may give you some ideas.


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Best Regards
Tinus Nielsen

(in reply to TLH101)
       Post #: 28

RE: 1/5 scale Bell P-39 Aircobra... - 1/10/2006 2:46:05 PM   
Darrell B.



Posts: 375
Joined: 12/22/2003
From: Rogers, AR, USA
Status: offline 		Well the weekened is over and I had a few minutes to work on my P-39. I was able to figure out that I'm going with the torque rod and will order the DuBro parts that I need to accomplish this. That is OK, I can still build up the bottom of the stab and sheet it. Then on to the V stab.

I'm sorry if this is taking forever, I'm also trying to deal with taking care of my mom, who had a fall before Christmas, and is now in a nursing home. With any luck, I can talk her Doctor into letting her move in with my family, and I won't have to drive on Saturdays to go check on her. That should give me a little more building time.

Anyway, here are a couple of more pics of the H stab. The ruller is an 18"s for refference.

Good Luck to all,
Darrell



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(in reply to Pelle Gris)
       Post #: 29

RE: 1/5 scale Bell P-39 Aircobra... - 1/10/2006 5:47:08 PM   
razorback11


 

Posts: 63
Joined: 1/15/2002
From: Yorktown, VA, USA
Status: offline 		Darrel,
I too have put some thought into building a P-39 and placing the engine in the scale location. As far as cooling goes, Vaily Aviation makes a scale cooling fan for their Focke Wulf 190 that could be used on your shaft inside your fuse to constantly circulate air past your engine cylinder. I think you can rout enough fresh air in using the top mounted scale scoop and the wing leading edge air inlets. Air can be routed out using the scale wing air outlet ducts in the trailing edge area of the wing center section. Don't be afraid to rig up a small fan like the ones that cool computer drives. You will likely have plenty of room in that fuse to get creative and they don't weigh much. It would just take another battery pack. The fan does not have to move at full speed as long as it pushes air past the engine. Great thread. Scale model building is a problem solving event from start to finish....that is what makes it fun. razorback11

(in reply to Darrell B.)
       Post #: 30

RE: 1/5 scale Bell P-39 Aircobra... - 1/12/2006 2:57:04 AM   
Darrell B.



Posts: 375
Joined: 12/22/2003
From: Rogers, AR, USA
Status: offline 		Thought that I would give an update on the P-39. I finished framing the horizontal stab, and it is ready for the bottom sheeting. I think I remembered everything, but if you think you see something I missed, please chime in.
Thanks,
Darrell

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(in reply to rrudytoo)
       Post #: 31

RE: 1/5 scale Bell P-39 Aircobra... - 1/14/2006 10:01:36 AM   
optech



Posts: 262
Joined: 1/26/2002
From: Yuma, AZ, USA
Status: offline 		Are the Consolidated plans still available? I wouldn't mind a 100'ish wingspan model.

I found the Palmer plans site but am a little confused. They only recommend a .91 two-stroke. What's up with that????

Thanks,
Mike

(in reply to Darrell B.)
       Post #: 32

RE: 1/5 scale Bell P-39 Aircobra... - 1/14/2006 12:58:58 PM   
Darrell B.



Posts: 375
Joined: 12/22/2003
From: Rogers, AR, USA
Status: offline 		Mike,
I know that Palmer is very overly optemistic about his final weights on all of his planes, especially these. He also tends to underpower them. That said, it is supposed to be a fair set of plans, some issues with parts not fitting. There is a guy on the ScaleRCBuilder sight that is building one.
I don't know about the consolidated plans. I thought that they were a kit, or composit that was for sale?
Sorry I don't know more,
Darrell

(in reply to optech)
       Post #: 33

RE: 1/5 scale Bell P-39 Aircobra... - 1/14/2006 2:12:03 PM   
TLH101



Posts: 5439
Joined: 12/27/2001
From: Corpus Christi, TX, USA
Status: offline 		The Consolodated plans do not have enough info to scartch build, as the it was a glass & foam kit. There is a large kit available from American Eagle that is almost a copy of the Consolodated model.
http://www.flyrcmodels.com/

_____________________________

Terry
"Old Fart" in training. (not to be an R/Cer, but to be an "Old Fart")

(in reply to Darrell B.)
       Post #: 34

RE: 1/5 scale Bell P-39 Aircobra... - 1/14/2006 3:52:53 PM   
Darrell B.



Posts: 375
Joined: 12/22/2003
From: Rogers, AR, USA
Status: offline 		New update for all of you balsa dust sniffers!

I have the first half of the elevators built, as well as the H stab compleated except for final sanding to shape. The elevators need to be turned over and the bottoms built, as well as hinge pockets drilled, and final shaping on them as well. Next I'll start on the rudder and V stab. I also need to make copies of the wing ribs so that I can start cutting them out.

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(in reply to TLH101)
       Post #: 35

RE: 1/5 scale Bell P-39 Aircobra... - 1/20/2006 10:02:03 PM   
Darrell B.



Posts: 375
Joined: 12/22/2003
From: Rogers, AR, USA
Status: offline 		I thought that I would post a few updated pictures. These are of the elevator counter balances. On the plans he says to use soft blocks for the counter balances. I chose to loose a little weight, and used some 3/32 balsa formers, and 1/16 sheeting to build them up. The results are very nice, and light.

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(in reply to Darrell B.)
       Post #: 36

RE: 1/5 scale Bell P-39 Aircobra... - 1/20/2006 10:08:35 PM   
Darrell B.



Posts: 375
Joined: 12/22/2003
From: Rogers, AR, USA
Status: offline 		Here are a few pictures of the rudder, hinges, and control horns.

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(in reply to Darrell B.)
       Post #: 37

RE: 1/5 scale Bell P-39 Aircobra... - 1/21/2006 2:47:18 AM   
FBaity


 

Posts: 639
Joined: 12/29/2003
From: Tuscaloosa, AL, USA
Status: offline 		Darrell,

Really looking good, keep us posted. Do you still have the GS p-51?

Frank Baity
AMA 38036

(in reply to Darrell B.)