RE: Nitro 90" P-38 (1/7 scale) with 3 piece wing and more  
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RE: Nitro 90" P-38 (1/7 scale) with 3 piece wing ... - 2/3/2008 4:49:33 AM   
ram3500-RCU



Posts: 1670
Joined: 8/17/2002
From: n. canton, OH, USA
Status: offline 		More progress on the booms and gear. I have worked out the mounting plate and supporting structure for the mains. The port boom now has gear. As things go, the tire wound up dead center of one of my gear door formers. I'll work this out when I get them cut apart. As I have been doing all along, I'm making patterns of everything I cut for anyone who may want to try this.

You will see that I cut away some wing mount to clear the tire. This won't matter as I plan on mounting the boom to the center section permanently. They will just hold everything in place till the epoxy or Gorilla glue dries.

The other hole in the plate is for the throttle servo, accessed through the gear bay, as will be the rudder and elevator servos which will rest just behind the tire.

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< Message edited by ram3500-RCU -- 2/3/2008 4:55:13 AM >

(in reply to ram3500-RCU)
       Post #: 26

RE: Nitro 90" P-38 (1/7 scale) with 3 piece wing ... - 2/3/2008 2:15:28 PM   
BHskybolt


 

Posts: 29
Joined: 9/3/2006
From: Salem, AL, USA
Status: offline 		That is looking really good.. I can't wait to get them templates and start on my booms.... I have the wing just about finnished and I am in the middled of fiberglassing it.. What size wheels are you using? Also I have been looking for a formula for calculating Scale.... I notice in a couple of previouse posts that you refer to some of the mods your making are close to 1/7th scale, How are you figuring this out? I have a Three view that I want to have enlarged the size of this P-38 and that is why I am asking...

Thanks,
Brad

(in reply to ram3500-RCU)
       Post #: 27

RE: Nitro 90" P-38 (1/7 scale) with 3 piece wing ... - 2/3/2008 5:38:18 PM   
ram3500-RCU



Posts: 1670
Joined: 8/17/2002
From: n. canton, OH, USA
Status: offline
quote:

ORIGINAL: BHskybolt

That is looking really good.. I can't wait to get them templates and start on my booms.... I have the wing just about finnished and I am in the middled of fiberglassing it.. What size wheels are you using? Also I have been looking for a formula for calculating Scale.... I notice in a couple of previouse posts that you refer to some of the mods your making are close to 1/7th scale, How are you figuring this out? I have a Three view that I want to have enlarged the size of this P-38 and that is why I am asking...

Thanks,
Brad

Brad, the full scale P-38 J had a wingspan of 52'. 1/7 of that is 89 1/8" and our plane is just under 90". So I am using 1/7 scale as a very close place to start with all my calculations.

I have a book by Bert Kinzey on the P-38 called D&S (detail & scale) volume 58 part 2 (P-38J - P-38M). In it you will find lots of good pictures and three views but it also has a page of three views with all the major dimensions on it (missing in the Walk Around books). I got this book at Borders Book Store.

It is a simple matter to take any of dimension shown, and divide by seven, for our plane. For instance, the full scale main tire - 36", 1/7 of that is 5 1/8" which should be our main gear tire. I cheated that down a little to 4 3/4", still much larger than the ones in the kit. The full scale nose gear tire is 27", 1/7 of that is 3 7/8" and I am using one 3 3/4". Interesting that the yoke built into the Yellow Aircraft nose gear does not allow you to use the 1/6 scale size tire for that plane.

As far as the templates and instructions go, I am saving copies of every part I'm putting in her, but will wait till she is on all three gear before I release the stuff to make sure it all works to my satisfaction and I want to make sure my angles and locations are right for the mounting plates and all. I have to get her back on her feet and see how the static angle of attack is also. The top of the rudders on the full scale were 9' 10 3/8" and the canopy was 9' 9 5/16" off the ground when parked. Ours should be 16 15/16" and 16 3/4" respectively, or somewhere close, and I don't have the nose gear in yet, to test that. You can see from these dimensions how nose high she sat on the ground. The bottom of the rudders were only 2' 9 3/8" off the ground hence the need for those bumpers they had on the bottom!!

I may need to add the curve to the center pod as well, something I have been debating for weight considerations. But, on the other hand, that would give me a nice roomy place to install a good size air tank for the gear, not to mention how much better it would look with a curved gear door. I think I could blend the nose into the stock fiberglass nose cone and still make it look a lot more scale.

BTW, I'm using the Robart spring down air up nose gear for positive lock on the nose. Don't want to scuff the nice cone that comes in the kit.

< Message edited by ram3500-RCU -- 2/3/2008 8:11:36 PM >

(in reply to BHskybolt)
       Post #: 28

RE: Nitro 90" P-38 (1/7 scale) with 3 piece wing ... - 2/3/2008 10:28:46 PM   
BHskybolt


 

Posts: 29
Joined: 9/3/2006
From: Salem, AL, USA
Status: offline 		Gary thanks for all the info.. More than helpful, I figured it was probably simple division but I have not done much scale stuff so I thought it would be better if I ask to be sure.. Thanks for all the help and I am going to try and find that book as well as anticipate the templates.....

Have a great day.
Brad

(in reply to ram3500-RCU)
       Post #: 29

RE: Nitro 90" P-38 (1/7 scale) with 3 piece wing ... - 2/4/2008 6:13:33 AM   
ram3500-RCU



Posts: 1670
Joined: 8/17/2002
From: n. canton, OH, USA
Status: offline 		Back on the wings and engines. They are installed and the booms are fitin place. I had to notch both the leading and trailing edges for the tanks and tires respectively. I set it up on it's mains and it looks like everything is working out well and authentic looking. It will take a pretty long nose strut, but the full scale had one also. Still not sure about the bottom of the center pod. I am waiting for my nose gear to show up now. Can't do the gear doors till my hinges get here. In the mean time, I'll be working on the tail and controls, fairings for the pilot pod, and other things.

Those struts are 1/2" and I wouldn't want them any smaller. I think they look about right.

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< Message edited by ram3500-RCU -- 2/4/2008 6:19:55 AM >

(in reply to BHskybolt)
       Post #: 30

RE: Nitro 90" P-38 (1/7 scale) with 3 piece wing ... - 2/4/2008 6:17:16 AM   
ram3500-RCU



Posts: 1670
Joined: 8/17/2002
From: n. canton, OH, USA
Status: offline 		Couple more shots of the wing work. Again, the CF wing tube goes past the boom and right up to the aluminum stock tube for the center section. I'm not worried about the notches.

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(in reply to ram3500-RCU)
       Post #: 31

RE: Nitro 90" P-38 (1/7 scale) with 3 piece wing ... - 2/6/2008 5:28:38 AM   
ram3500-RCU



Posts: 1670
Joined: 8/17/2002
From: n. canton, OH, USA
Status: offline 		Although I am waiting on the offset hinges to show, I finished making the gear doors. I laminated them with 1/32 ply to give them strength and keep them straight. I left the skin long in the rear to overlap the aft fuselage for a nice look. The extra layers of sheeting in the front gave me the slight inset look they needed. They are strong and light. I now have the whole mess sanded and coated with Balsa Rite, in preparation for covering with flat Grey Monocote. When all the covering is back on, I will go to work with Rustoleum and make it look as though it has a few victories to it's credit.

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< Message edited by ram3500-RCU -- 2/6/2008 5:32:56 AM >

(in reply to ram3500-RCU)
       Post #: 32

RE: Nitro 90" P-38 (1/7 scale) with 3 piece wing ... - 2/6/2008 5:39:04 AM   
ram3500-RCU



Posts: 1670
Joined: 8/17/2002
From: n. canton, OH, USA
Status: offline 		Now for those cowls. I am going to laminate tree layers of 6MM Depron to the bottoms, blend them into the fuselage, and then glass over the foam. They fit perfectly over the engines. I am going to have to mount the Pitts mufflers backwards, so as not to have to notch the crap out of cowl, but I will cut the tubes 1/2" or so out of the cowl and angle the cut toward the rear.

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(in reply to ram3500-RCU)
       Post #: 33

RE: Nitro 90" P-38 (1/7 scale) with 3 piece wing ... - 2/6/2008 5:44:13 AM   
ram3500-RCU



Posts: 1670
Joined: 8/17/2002
From: n. canton, OH, USA
Status: offline 		Now for a question. All along my intension was to stay with the camo look and just improve on it with detailing, weathering, and invasion stripes. I am having second thoughts. I am considering the natural metal finish that most of these J models came in. I'm looking at a complete paint job anyway. What do you guys think?

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< Message edited by ram3500-RCU -- 2/6/2008 5:45:16 AM >

(in reply to ram3500-RCU)
       Post #: 34

RE: Nitro 90" P-38 (1/7 scale) with 3 piece wing ... - 2/6/2008 11:27:18 AM   
BHskybolt


 

Posts: 29
Joined: 9/3/2006
From: Salem, AL, USA
Status: offline 		I think the Aluminum look is awsome...And most likely easier to see in the air.. I am covering mine in Flight Metal... With the Virginia Marie scheme. You are making good progress and its looking really good.

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(in reply to ram3500-RCU)
       Post #: 35

RE: Nitro 90" P-38 (1/7 scale) with 3 piece wing a... - 2/7/2008 11:10:40 PM   
ram3500-RCU



Posts: 1670
Joined: 8/17/2002
From: n. canton, OH, USA
Status: offline 		I now have the cowls blended into the new shape on the bottom. The Depron and Gorilla glue worked great. All I have to do now is glass over the foam.

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(in reply to ram3500-RCU)
       Post #: 36

RE: Nitro 90" P-38 (1/7 scale) with 3 piece wing a... - 2/7/2008 11:13:52 PM