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Chambers R-1 build

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Chambers R-1 build

Post  JPvelo on Mon May 16, 2016 1:23 pm

I'm getting started on my entry for the "Tuscon" 1cc scale contest and thought I would do a build thread. I'll be doing a Chambers R-1 Chambermaid for the single engine plank category. Wingspan will be just shy of 18" with a prop face to back of rudder length of about 21 3/4", wing area about 80 square inches. Should fly like a dream. lol!

I'm going to do all separated control surfaces and copy any panel lines with surface contours, no ink lines on this one.

Power will be a Norvel Big Mig .061.

All I have so far is my 3 view drawings and a wing blank butt gluing together, I'll keep you posted.





Last edited by JPvelo on Tue Oct 25, 2016 11:21 am; edited 2 times in total
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Re: Chambers R-1 build

Post  ian1954 on Mon May 16, 2016 1:53 pm

I hope you are going to do a build thread on this one. I am guessing that you will be cutting stringers for the rear part of the fuselage and ribs for the rudder.

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Re: Chambers R-1 build

Post  JPvelo on Mon May 16, 2016 1:59 pm

ian1954 wrote:I hope you are going to do a build thread on this one. I am guessing that you will be cutting stringers for the rear part of the fuselage and ribs for the rudder.


Ian,

That's exactly what I had in mind, I'm currently trying to source 1/32 square basswood strip.

Jim
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Re: Chambers R-1 build

Post  ian1954 on Mon May 16, 2016 2:24 pm

If you lived near me I would machine it up for you.

If I look at the picture though and scale that to 21" - 1/32 looks too small - the stringers look quite pronounced.

Try enlarging the picture and measure before you buy - just to be sure. The ribbed look seems to be a key feature.

Could be my eyes though!
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Re: Chambers R-1 build

Post  JPvelo on Mon May 16, 2016 7:10 pm

Ian,

In scale competition any line that is on the three view drawing needs to represented on the model. As this is a 1/4" thick profile fuselage model I won't be building up stringers to apply covering over. The common practice would be to draw the stringers on with a fine line pen after paint and then clear coat the model. I want to avoid ink lines as models can tend to start looking like a caricature of an airplane. I plan on using very thin wood strip instead of ink lines. We'll see how it turns out. Now I'm trying to get my mind around laying the "21" decal over such a setup.

Anyway, got the wing glued up and cut out today. Next step is 1/16" basswood strip all around and sanding to an airfoil.

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Re: Chambers R-1 build

Post  JPvelo on Mon May 16, 2016 8:02 pm

Here's more shots of the prototype. This and the one in the original post are all I can find. Sure wish I had one of the front.

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Re: Chambers R-1 build

Post  RknRusty on Mon May 16, 2016 9:36 pm

That's a really interesting plane. The landing gear is unique too... to me anyway. Looks like a challenge, and I look forward to seeing your build.
Rusty

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Re: Chambers R-1 build

Post  JPvelo on Mon May 16, 2016 10:33 pm

RknRusty wrote:That's a really interesting plane. The landing gear is unique too... to me anyway.
Rusty

Yeah it's different. It's a retractable gear that pulls the wheels tight to the fuselage but leaves them exposed.

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Re: Chambers R-1 build

Post  pkrankow on Mon May 16, 2016 10:42 pm

The gear looks a lot like the type the PBY Catalina and Grumman Goose used.

Phil
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Re: Chambers R-1 build

Post  roddie on Tue May 17, 2016 8:22 am

Hi Jim, Man.. that's a tough airplane to find pictures of. I checked all three of my "big-book" encyclopedias.. and it wasn't even listed. Shocked

I did have an idea for the stringers though.. Eyebrows "Angel-Hair" spaghetti.. or Capelli d'angelo is available at your local supermarket for about $1.50/box. Full length pieces should be more than long enough for where you need them. Glue them on.. and cover with tissue; brushed-on over them. Average OD is about 1/32". It will give the fuse a more 3-D look.. and being round; might make it easier to apply the "21" graphic over. It wouldn't be too hard to form fillets along the stringers, by using your finger with a little white-glue. This would provide a solid (void-free) base for applying tissue afterward.

Capellini wiki



If it doesn't work out.. boil them up and serve with a nice marinara gravy... lol!
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Re: Chambers R-1 build

Post  JPvelo on Tue May 17, 2016 9:42 am

Thanks Roddie,

When I was finishing the Bellanca I purchased tubbetti to use as exhaust stacks. It ended up being to big but I made a a great minestrone with it!

I found this, it's between 1/64" and 1/32". I'm going to see if my local hobby shop can order it for me so I avoid the shipping charges:

http://www.hobbylinc.com/cgi-bin/s8.cgi?cat_s=RCE&p=4
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Re: Chambers R-1 build

Post  roddie on Tue May 17, 2016 10:56 am

JPvelo wrote:Thanks Roddie,

When I was finishing the Bellanca I purchased tubbetti to use as exhaust stacks. It ended up being to big but I made a a great minestrone with it!

I found this, it's between 1/64" and 1/32". I'm going to see if my local hobby shop can order it for me so I avoid the shipping charges:

http://www.hobbylinc.com/cgi-bin/s8.cgi?cat_s=RCE&p=4

I knew that someone had posted pics of elbow macaroni for use as exhaust pipes.. but couldn't find them. I have pics of most of your builds too.. but not the Bellanca Huh...

It's great that you can get what you want to use for the stringers. It might be lighter in weight than the pasta would be too.
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Re: Chambers R-1 build

Post  JPvelo on Tue May 17, 2016 11:16 am

Roddie, Bellanca build photos are on the bottom of this thread:

https://www.coxengineforum.com/t8898-tucson-1cc-multi-engine-scale-contest-report
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Re: Chambers R-1 build

Post  roddie on Tue May 17, 2016 12:12 pm

JPvelo wrote:Roddie, Bellanca build photos are on the bottom of this thread:

https://www.coxengineforum.com/t8898-tucson-1cc-multi-engine-scale-contest-report

Oh yea!!!! (nice shirt! Thumbs Up ) Thanks Jim. New folder created!
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Re: Chambers R-1 build

Post  RknRusty on Tue May 17, 2016 1:25 pm

Macaroni! what a great idea. I'm going to try that on my Yak. Poor thing's been waiting for pipes for two years now.
Adding Marconi to shopping list 10-4 Elenor.
Rusty

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Re: Chambers R-1 build

Post  JPvelo on Tue May 17, 2016 6:04 pm

Went to the hobby shop on the way home from work to have them order wood for my stringers and they had it in stock. Already made up a test patch to see how I'm going to work this.





I have the leading and trailing edges soaking so I can laminate at least the leading edge tomorrow.

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Re: Chambers R-1 build

Post  stuntflyr on Tue May 17, 2016 8:16 pm

Coolest racer ever, tiny thing. Had a four banger Menasco. I almost bought 4 of those engines one day but gave up in a moment of weakness. That has to have a full cowling, right? All 1/4 slabs carved into shape? Super cool.
Chris...
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Re: Chambers R-1 build

Post  JPvelo on Tue May 17, 2016 9:06 pm

Yep, nothing thicker than 1/4", 3/8" with doublers to the mid point of the wing.

Jim
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Re: Chambers R-1 build

Post  JPvelo on Wed May 18, 2016 6:35 pm

After soaking for 24hrs the basswood leading edge is laminated on. Tommorow I'll cut and sand off the excess then glue the trailing edge on. This weekend I'll sand to shape and cut the ailerons out.

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Re: Chambers R-1 build

Post  Oldenginerod on Wed May 18, 2016 6:59 pm

JPvelo wrote:After soaking for 24hrs the basswood leading edge is laminated on. Tommorow I'll cut and sand off the excess then glue the trailing edge on. This weekend I'll sand to shape and cut the ailerons out.
A). What did you soak it in?
B). How do you glue it on wet?
or
C). Do you tape it on to dry to shape & then glue it?
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Re: Chambers R-1 build

Post  JPvelo on Wed May 18, 2016 7:13 pm

Oldenginerod wrote:
JPvelo wrote:After soaking for 24hrs the basswood leading edge is laminated on. Tommorow I'll cut and sand off the excess then glue the trailing edge on. This weekend I'll sand to shape and cut the ailerons out.
A). What did you soak it in?
B). How do you glue it on wet?
or
C). Do you tape it on to dry to shape & then glue it?

Rod,

Loved your article in the Cox Quarterly, funny how things work out sometimes.

To answer your questions the basswood is soaked In water and glued on wet.

Jim
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Re: Chambers R-1 build

Post  Oldenginerod on Thu May 19, 2016 5:01 am

Yeah Jim, Bernie was struggling for articles, so I thought I'd give a rundown of my Tach Race experience. Note articles from CEF compatriots Kim Stricker & Paul Gibeault also.
I'm sure everyone here knows about it, but I'm still a little shocked about my win even after all this time. I haven't been game to install the engine on any plane yet. Haven't even run it since Kim shipped it home. I do have plans to use the Black Widow prize engine on my Ringmaster Bipe kit I got from Roger. It ran third in the race so should haul it around nice & quick. I'll have to find a bigger flying field so I can use longer lines than the 30' I currently use or it will screw me into the ground.

Hey what sort of glue is that which will stick to wet wood? I thought that would be a big no no, that's why I asked. It looks like the wing is just flat, not shaped at all. I guess it just has to go round & round so flight performance isn't so critical
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Re: Chambers R-1 build

Post  pkrankow on Thu May 19, 2016 7:32 am

If you can hold the shape long enough any PVA type glue will work well, but won't bond till mostly dry. This would be white school glue, or Titebond, or Elmer's wood glue (among a large number of others)

If you can hold the shape till fully dry the shape should stay in so you can use your choice of glue later.

Phil
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Re: Chambers R-1 build

Post  JPvelo on Thu May 19, 2016 7:55 am

Rod,

I use Titebond wood glue, like Phil suggest. I dry and glue all in one step.
Yes it's a flat 1/4" airfoil, I'll sand some shape into it later. The contest I'm building for has a "plank" category.

The rules are here:

http://stunthanger.com/smf/12-a-building/2016-'tuscon'-1cc-multi-engine-scale/?action=dlattach;attach=249924
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Re: Chambers R-1 build

Post  JPvelo on Thu May 19, 2016 7:00 pm

Allright,

Got everything dry and the tape off:


Used a router to make a pocket for tip weight, plugged it with hard balsa:



Plug clamped and trailing edge taped:


I'll get it sanded and looking like a wing tomorrow. I hope to get the main portion of the fuselage cut out tomorrow and get the engine bearers and landing gear mount installed.

Jim
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Re: Chambers R-1 build

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