Cox Engines Forum
You are not logged in! Please login or register! Guests are limited to posting in the "General Questions (Guest Posting Allowed)" section only. Becoming a member is fast, easy and FREE!


    Ringmaster JR Flash Babe_b10
Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» ENYA .35 rod
by Dave P. Today at 6:33 pm

» Follow The World's Smallest Traveling Engine!
by modelbuilder49 Today at 6:03 pm

» Coved-19 and how it affects life
by OhBee Today at 5:54 pm

» Printing in tile program
by andrew Today at 1:23 pm

» It’s the Pitts….
by rsv1cox Today at 9:49 am

» os wankel?
by robot797 Today at 9:18 am

» Start a collection
by Oldenginerod Today at 1:46 am

» COXADOODLEDO
by Admin Today at 1:45 am

» Testors project engine??
by Oldenginerod Today at 1:45 am

» Another proposed design by Roddie
by OhBee Yesterday at 7:10 pm

Cox Engine of The Month
March-2020
Dave P.'s

"Tee Dee .051"



PAST WINNERS
CEF Traveling Engine

Win This Engine!
Gallery


    Ringmaster JR Flash Empty

Ringmaster JR Flash

Go down

    Ringmaster JR Flash Empty Ringmaster JR Flash

Post  Ken Cook on Tue Mar 24, 2020 8:54 am

I clouded Roddie's glowplug thread enough with my rambling. I started this plane 2 weeks ago, given my daily schedule, this is good. I finished covering yesterday morning. This was a fun plane to build, not the typical construction of most as this wing went in from the top. A couple of things I have mentioned in the past that many don't readily recognize until it's too late. Building from a kit has one committed to the kit. Seeing that this kit was over 40 years old, the plywood parts were questionable. Sterling used a birch and poplar core plywood in the early years followed by the luan ply in the later years. Both species are just horrible for the intended purpose. When new, they serve a purpose well but degrade rather quickly. From a manufacturing standpoint, cheap is better.

Not to turn this into a kit bashing post, most kits make the F-1-F-3 formers a standard width. The problem is that they're generally not wide enough.This equates to jamming in your tank. The end caps don't fit within the doublers, this also doesn't allow any room for canting the tank if needed which can cause engine run issues prior to shutoff. Make your formers WIDER. All I had was a Brodak tank. Not my choice due to many manufacturing flaws and quality issues. The vents were in the wrong spot, it was full of flux which was causing internal corrosion even though it was never used . The tank itself was so twisted from end cap to end cap it deserved to be thrown in the
trash. I was able to rebend and remedy the twist and I replaced some of the pipes. I air tested and then discovered when I placed it in the model, the overflow pipe was too close to the edge which wouldn't allow the tank to go clear the engine beam. I moved the overflow pipe and all is good now.

    Ringmaster JR Flash Dscn2910 The top block is designed to be installed all the way to the front of F-2 gluing the tank in. NEVER build your tank into the model. At some point it will be an issue due to leaking or in need of height adjustment.

    Ringmaster JR Flash Dscn2911 I cut the top block and capped both ends with 1/64 ply providing a screw and tabs to lock it down

I'm not a fan of wheel collars as they look bulky, add weight and fall off. I use a tight fitting washer and solder as it looks clean.     Ringmaster JR Flash Dscn2912

    Ringmaster JR Flash Dscn2913 Another flaw is the bottom sheeting. Sterling offered one piece with the grain running from nose block to rudder. This is very poor as it offers no side to side strength, it doesn't follow curves well due to fighting the grain as it's bending to the curves. I cut 2" crossgrain pieces and tape them together to form a long piece. With tape holding, I open each piece like a book and put small dots of yellow glue on the edge and weigh it down. When dry, sand and it follows the curves perfectly.
Ken Cook
Ken Cook
Top Poster
Top Poster

Posts : 3770
Join date : 2012-03-27
Location : pennsylvania

Back to top Go down

    Ringmaster JR Flash Empty Re: Ringmaster JR Flash

Post  Mike1484 on Tue Mar 24, 2020 10:49 am

Looking real good Ken . I like my wheels done up like yours , soldered on with washers . The removable hatch is a good idea , I hate cutting into a plane to fix a fuel tank .

Mike1484
Mike1484
Mike1484
Gold Member
Gold Member

Posts : 189
Join date : 2011-10-28
Age : 71
Location : Northern Ohio

Back to top Go down

    Ringmaster JR Flash Empty Re: Ringmaster JR Flash

Post  DrCox on Wed Mar 25, 2020 7:14 pm

Ken Cook wrote:  I'm not a fan of wheel collars as they look bulky, add weight and fall off. I use a tight fitting washer and solder as it looks clean.
    Ringmaster JR Flash Dscn2912

Ken, great idea and exceptionally clean.

DrCox
DrCox
Gold Member
Gold Member

2020 Supporter

Posts : 199
Join date : 2018-07-18
Location : Wisconsin

Back to top Go down

    Ringmaster JR Flash Empty Re: Ringmaster JR Flash

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum