Cox Engines Forum
You are not logged in! Please login or register.

Logged in members see NO ADVERTISEMENTS!


CEF speed contest Design Discussions - Page 3 Cox_ba12




CEF speed contest Design Discussions - Page 3 Pixel

Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» Is this ae Bad idea?
by Scotland421 Today at 4:53 pm

» Purple Martins
by rdw777 Today at 3:53 pm

» Sig castor
by Scotland421 Today at 3:52 pm

» Engine trade --- A Cox diesel engine for an Enya .049 custom built?
by sosam117 Today at 5:47 am

» a cheap sport muffler
by roddie Today at 4:32 am

» Tee Dee .020 Drive Plate Removal
by rdw777 Today at 12:59 am

» piper l-4j wit cessna 150 wing miss monica tee dee .051
by davidll1984 Yesterday at 7:43 pm

» Stripped Glow Plug
by balogh Yesterday at 2:01 pm

» Man cave, or it's amazing how much you can accomplish on a rainy day
by rsv1cox Yesterday at 1:51 pm

» k&b 19 torpedo green head
by hasbeen Yesterday at 1:27 am

» Wanted k&b 19 torpedo green head parts
by hasbeen Tue Jun 22, 2021 10:44 pm

» Still don't get it.
by Ken Cook Tue Jun 22, 2021 9:37 pm

Cox Engine of The Month
June-2021
balogh's

"Little Red Rooster"




PAST WINNERS
CEF Traveling Engine

Win This Engine!
Forum Store
CEF Ear Savers
Gallery


CEF speed contest Design Discussions - Page 3 Empty

CEF speed contest Design Discussions

Page 3 of 40 Previous  1, 2, 3, 4 ... 21 ... 40  Next

Go down

Mad Re: CEF speed contest Design Discussions

Post  crankbndr Sat Nov 16, 2013 6:53 pm

The H-1 looks fast even on paper, the wing span is wrong, it should read 25' in this configuration

CEF speed contest Design Discussions - Page 3 Scan14
crankbndr
crankbndr
Diamond Member
Diamond Member

I Support My Forum

Posts : 2690
Join date : 2011-12-10
Location : Homestead FL

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  roddie Sat Nov 16, 2013 7:01 pm

@JPvelo wrote:Here's my first cut:
CEF speed contest Design Discussions - Page 3 J1QanN5
I think it was Roddie that said this already but man these things are small. I think we'll see some good speeds with this!

Jim
Jim, that cowl is sweeeet! (my cowl choice... Huh...  ) lol! 

Yea... this challenge really makes you realize how big your fingers (and tools) are. I'm going to use a 6" machinist rule for laying-out the remainder of the parts...
roddie
roddie
Top Poster
Top Poster

Posts : 7195
Join date : 2013-07-18
Age : 61
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  batjac Sat Nov 16, 2013 9:33 pm

@crankbndr wrote:The H-1 looks fast even on paper, the wing span is wrong, it should read 25' in this configuration

CEF speed contest Design Discussions - Page 3 Scan14
I actually got to sit in the cockpit of the H-1 Racer that was built in Cottage Grove, OR. Man, sitting in the cockpit and looking out, that nose seemed to go on forever! I wish I could have flown those old racers back in the day. Hmmm...

The Day Dreaming Mark
batjac
batjac
Diamond Member
Diamond Member

2019 Supporter

2020 Supporter

Posts : 1979
Join date : 2013-05-23
Age : 58
Location : Portland, OR, USA

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  crankbndr Sat Nov 16, 2013 9:49 pm

Did you know the builder, that must have been cool to sit in the cockpit. The crash that destroyed the plane that killed the builder was because of a variable pitch prop malfunction.

http://vimeo.com/2745432


Last edited by crankbndr on Sat Nov 16, 2013 10:02 pm; edited 1 time in total
crankbndr
crankbndr
Diamond Member
Diamond Member

I Support My Forum

Posts : 2690
Join date : 2011-12-10
Location : Homestead FL

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  JPvelo Sat Nov 16, 2013 10:00 pm

@batjac wrote:I've got mine picked out.  I just have to figure out how to make the graphics for the sides.  I was gonna pass on this contest, as I been kinda poorly the last few weeks, but a challenge is a challenge.   I spent about an hour last night thinking about how I'd do it.  Soon's I finish the project I'm working on now, I'll draw it out and start cutting wood.  I think I'm gonna try something a little different with the engine this time.  If it works, I'll post build pics of the plane.  If it don't work, well, forget I ever made this post.

The Under Wraps Mark
Remember, you don't need a scale paint scheme for this contest. If you want to that would be great but it's not mandatory.

Jim
JPvelo
JPvelo
Diamond Member
Diamond Member

Posts : 1962
Join date : 2011-12-02
Age : 53
Location : Phoenix

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  JPvelo Sat Nov 16, 2013 10:03 pm

@roddie wrote:
@JPvelo wrote:Here's my first cut:
CEF speed contest Design Discussions - Page 3 J1QanN5
I think it was Roddie that said this already but man these things are small. I think we'll see some good speeds with this!

Jim
Jim, that cowl is sweeeet! (my cowl choice... Huh...  ) lol! 

Yea... this challenge really makes you realize how big your fingers (and tools) are. I'm going to use a 6" machinist rule for laying-out the remainder of the parts...
That cowl unfortunately no longer exist. I tried soaking it in acetone to remove the paint. Not only did it remove the paint, it removed the cowl as well.

Jim
JPvelo
JPvelo
Diamond Member
Diamond Member

Posts : 1962
Join date : 2011-12-02
Age : 53
Location : Phoenix

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  Cribbs74 Sat Nov 16, 2013 10:07 pm

That's funny...lol! 

Sorry
Cribbs74
Cribbs74
Moderator

2019 Supporter

2020 Supporter

2021 Supporter

Posts : 11525
Join date : 2011-10-24
Age : 47
Location : Tuttle, OK

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  JPvelo Sat Nov 16, 2013 10:11 pm

@Cribbs74 wrote:That's funny...lol! 

Sorry
That cowling was from the ill fated staggerwing series of planes so it was probably cursed anyway. Good riddance to bad rubbish.

Jim
JPvelo
JPvelo
Diamond Member
Diamond Member

Posts : 1962
Join date : 2011-12-02
Age : 53
Location : Phoenix

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  OVERLORD Sun Nov 17, 2013 3:35 pm

Yesterday, I undusted this little book I bought a few years ago in the UK. The original edition dates from 1941 and helps to recognise friendly and hostile aircraft.

CEF speed contest Design Discussions - Page 3 Imgp5711

It's got profile and plan views of fighters, bombers, trainers, seaplanes... and with a brief description. Aircraft are grouped in chapters according to single or multi engine, high wing, low wing etc.

CEF speed contest Design Discussions - Page 3 Imgp5712

Lieven
OVERLORD
OVERLORD
Diamond Member
Diamond Member

Posts : 1593
Join date : 2013-03-19
Age : 55
Location : Normandy, France

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  roddie Mon Nov 18, 2013 1:12 pm

Nice legs... it's gonna be hard to replicate those on my model tongue 


CEF speed contest Design Discussions - Page 3 Bearca11
roddie
roddie
Top Poster
Top Poster

Posts : 7195
Join date : 2013-07-18
Age : 61
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  JPvelo Mon Nov 18, 2013 1:21 pm

@roddie wrote:Nice legs... it's gonna be hard to replicate those on my model tongue 


CEF speed contest Design Discussions - Page 3 Bearca11
Remember Roddie landing gear is not required to be in the scale location. I'm struggling with that idea on my corsair, I want it in the scale location but I don't want to add five hours to the build!

Jim
JPvelo
JPvelo
Diamond Member
Diamond Member

Posts : 1962
Join date : 2011-12-02
Age : 53
Location : Phoenix

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  roddie Mon Nov 18, 2013 2:46 pm

It presents a challenge to me... I'm always up for that. My planned gear will weigh a little more... but I don't think that building these little speed ships "light" is in anyone's best interest; when flying these models in an 84' dia. circle.

Line-drag alone is something that needs to be considered. The plane is gonna unwind; well before the 10th lap... so isn't it better to have some weight out there, along with minimum control-throws, to maintain the fastest level flight?

Scale-like gear will also track better at R.O.G. making for a smooth climb-out. Anything to try to avert a mishap... I'm trying to think the flight through, and all the forces that the model may be subjected to... I keep wanting to build engine/rudder offset into the fuse... but it's only advantageous to a Stunt model... and this would only induce drag in a speed ship. One could probably gain speed, with slight inboard offsets, on a properly weighted model.
roddie
roddie
Top Poster
Top Poster

Posts : 7195
Join date : 2013-07-18
Age : 61
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

Mad Roddie's "Rare-Bear" F8F-2

Post  roddie Mon Nov 18, 2013 5:28 pm

CEF speed contest Design Discussions - Page 3 11-18-10
CEF speed contest Design Discussions - Page 3 11-18-11
CEF speed contest Design Discussions - Page 3 11-18-12
roddie
roddie
Top Poster
Top Poster

Posts : 7195
Join date : 2013-07-18
Age : 61
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  JPvelo Mon Nov 18, 2013 6:31 pm

Nice work Roddie, I anticipate making some progress this week.

Jim
JPvelo
JPvelo
Diamond Member
Diamond Member

Posts : 1962
Join date : 2011-12-02
Age : 53
Location : Phoenix

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  batjac Mon Nov 18, 2013 6:55 pm

@crankbndr wrote:Did you know the builder, that must have been cool to sit in the cockpit. The crash that destroyed the plane that killed the builder was because of a variable pitch prop malfunction.
http://vimeo.com/2745432
I flew down to Cottage Grove for a biplane fly-in one weekend, and the owner showed off his H-1 to the attendees. He was gracious enough to let me sit in the cockpit to see what it was like in one of those old race planes. Golden Age of Aviation, indeed.

The "After My Time" Mark
batjac
batjac
Diamond Member
Diamond Member

2019 Supporter

2020 Supporter

Posts : 1979
Join date : 2013-05-23
Age : 58
Location : Portland, OR, USA

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  JPvelo Tue Nov 19, 2013 6:18 pm

JPvelo
JPvelo
Diamond Member
Diamond Member

Posts : 1962
Join date : 2011-12-02
Age : 53
Location : Phoenix

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  roddie Tue Nov 19, 2013 7:29 pm

Great resource Jim! Thank You! Thumbs Up
roddie
roddie
Top Poster
Top Poster

Posts : 7195
Join date : 2013-07-18
Age : 61
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  OVERLORD Tue Nov 19, 2013 7:58 pm

Great site, Jim. A few days ago, I looked at pictures of the Tsunami, also mentioned on this site.

CEF speed contest Design Discussions - Page 3 R86-ts10

Below the CL version: 1 picture, 2 birds

CEF speed contest Design Discussions - Page 3 530_ts10

Lieven
OVERLORD
OVERLORD
Diamond Member
Diamond Member

Posts : 1593
Join date : 2013-03-19
Age : 55
Location : Normandy, France

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  duke.johnson Tue Nov 19, 2013 8:48 pm

Great site Jim. Although, I might have to change my plans now. THANKS!
duke.johnson
duke.johnson
Diamond Member
Diamond Member

Posts : 1734
Join date : 2012-11-06
Age : 49
Location : Rochester, Washington

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  pkrankow Tue Nov 19, 2013 9:04 pm

I shot white onto mine today.

I am trying Minwax polycrylic as a sealer/base. Put on 2 coats, washed with denatured alcohol and a "scrubby" sponge (surprisingly effective at removing the excess polycrylic, 24 hours old) However I probably should have put another coat or 2 on and stripped it down again.

1 coat grey primer, sanded, 1 coat white. In a couple hours it will go to the basement to cure.

I think the elevator is getting Monokote as an expedient.

Phil
pkrankow
pkrankow
Top Poster
Top Poster

Posts : 3025
Join date : 2012-10-02
Location : Ohio

Back to top Go down

Mad Roddie's "Rare-Bear" F8F-2

Post  roddie Wed Nov 20, 2013 3:11 am

@JPvelo wrote:
@roddie wrote:Nice legs... it's gonna be hard to replicate those on my model tongue 


CEF speed contest Design Discussions - Page 3 Bearca11
Remember Roddie landing gear is not required to be in the scale location. I'm struggling with that idea on my corsair, I want it in the scale location but I don't want to add five hours to the build!

Jim
Jim... you were close to the mark on the "5 hour" extended build-time on scale-like gear/placement. Since I enjoy building... I went for it.

(edit) The wheels; I made years ago... on a CNC router. They are 15/16" in dia. and 3/16" thick (5/32" foam faced both sides with .015" styrene.) with 1/8" axle holes that need to be bushed for .062" dia. m.w. axles. #15 O-Rings make the perfect tire... stretching on to the wheel and compressing the foam and seating against the styrene facers. Finish size is 1.125" dia. and the O-Ring is .125" dia. (tire width) I'll have some weights on the gear components in a little while.

CEF speed contest Design Discussions - Page 3 11-19-10
CEF speed contest Design Discussions - Page 3 11-19-11
CEF speed contest Design Discussions - Page 3 11-19-12
CEF speed contest Design Discussions - Page 3 11-19-13
roddie
roddie
Top Poster
Top Poster

Posts : 7195
Join date : 2013-07-18
Age : 61
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

Mad Roddie's "Rare-Bear" F8F-2

Post  roddie Wed Nov 20, 2013 6:04 am

My "scale-like" gear design-weight; as compared to a stk. Cox PT-19's gear.

in ounces...

CEF speed contest Design Discussions - Page 3 11-19-18
CEF speed contest Design Discussions - Page 3 11-19-15

and in grams...

CEF speed contest Design Discussions - Page 3 11-19-16
CEF speed contest Design Discussions - Page 3 11-19-17

Gear weight is less paint (on the .020" polycarbonate gear-doors) Struts are .062" music-wire, set in "cherry" hardwood blocks that attach to the underside hardwood strip leading-edge/spar, with #2 wood screws/washers, for a rigid mounting... that can be removed if needed. Wheel retainers are the old "twist-on" spring type that fit 1/16" dia. music-wire. The wheel axle-holes were bushed with 1/8" and 3/32" Aluminum tubing.
roddie
roddie
Top Poster
Top Poster

Posts : 7195
Join date : 2013-07-18
Age : 61
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  JPvelo Wed Nov 20, 2013 1:09 pm

@pkrankow wrote:I shot white onto mine today.  

I am trying Minwax polycrylic as a sealer/base.  Put on 2 coats, washed with denatured alcohol and a "scrubby" sponge (surprisingly effective at removing the excess polycrylic, 24 hours old)  However I probably should have put another coat or 2 on and stripped it down again.

1 coat grey primer, sanded, 1 coat white.  In a couple hours it will go to the basement to cure.

I think the elevator is getting Monokote as an expedient.

Phil
I'm curious to see how that finish comes out, I've been wanting to try it. Did you get before and after weights?

Jim


Last edited by JPvelo on Thu Nov 21, 2013 8:45 am; edited 1 time in total (Reason for editing : Spelling)
JPvelo
JPvelo
Diamond Member
Diamond Member

Posts : 1962
Join date : 2011-12-02
Age : 53
Location : Phoenix

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  JPvelo Wed Nov 20, 2013 1:14 pm

@roddie wrote:
@JPvelo wrote:
@roddie wrote:Nice legs... it's gonna be hard to replicate those on my model tongue 


CEF speed contest Design Discussions - Page 3 Bearca11
Remember Roddie landing gear is not required to be in the scale location. I'm struggling with that idea on my corsair, I want it in the scale location but I don't want to add five hours to the build!

Jim
Jim... you were close to the mark on the "5 hour" extended build-time on scale-like gear/placement. Since I enjoy building... I went for it.

(edit) The wheels; I made years ago... on a CNC router. They are 15/16" in dia. and 3/16" thick (5/32" foam faced both sides with .015" styrene.) with 1/8" axle holes that need to be bushed for .062" dia. m.w. axles. #15 O-Rings make the perfect tire... stretching on to the wheel and compressing the foam and seating against the styrene facers. Finish size is 1.125" dia. and the O-Ring is .125" dia. (tire width) I'll have some weights on the gear components in a little while.

CEF speed contest Design Discussions - Page 3 11-19-10
CEF speed contest Design Discussions - Page 3 11-19-11
CEF speed contest Design Discussions - Page 3 11-19-12
CEF speed contest Design Discussions - Page 3 11-19-13
I decided yo go with a non scale gear on the corsair for simplicity. I also don't want to stress a multi piece wing wit a landing gear. Plus making a profile corsair reduces the landing gear track by two inches, pretty tippy on a plane that will touchdown like a lawn dart.

Jim
JPvelo
JPvelo
Diamond Member
Diamond Member

Posts : 1962
Join date : 2011-12-02
Age : 53
Location : Phoenix

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  roddie Thu Nov 21, 2013 2:05 am

I'm hoping that good balancing and an ample elevator will permit non-eventful high-speed landings. This gear arrangement places the struts at right angles to the wing, on the leading edge and raked 10 deg. forward. Shock-loads should theoretically be distributed more "linear" to improve tracking. By comparison; an inverted "V" (music-wire) main-gear will twist both struts off-axis, with either or both wheels being loaded.

Maybe I'll end up with the well-known "Spitfire's" gear issues; when being modeled as a flying scale subject. I hope not...
roddie
roddie
Top Poster
Top Poster

Posts : 7195
Join date : 2013-07-18
Age : 61
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

Mad Re: CEF speed contest Design Discussions

Post  Sponsored content


Sponsored content


Back to top Go down

Page 3 of 40 Previous  1, 2, 3, 4 ... 21 ... 40  Next

Back to top


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