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!


Cox Engines Forum

The official forum for 24/7 Cox Engines and Model Discussion! Ask Questions, Answer Questions, Discuss Cox engines, Cox products, anything CL, FF, RC, 1/2A, and more! Although memberships are encouraged, guests are always welcome!

Log in

I forgot my password

Search
 
 

Display results as :
 

Rechercher Advanced Search

Latest topics
» 1960 Scientific P-40 Profile kit
by getback Today at 7:46 am

» "Where I Live"
by rsv1cox Today at 7:25 am

» How's the weather?
by GallopingGhostler Today at 7:11 am

» Allen Brickhaus Memorial AA Contest...Paducah, Kentucky
by GallopingGhostler Today at 7:01 am

» **We Have A Tie** Cox Engine of the Month (August 2018)
by Admin Today at 1:15 am

» My new to me additions
by Ken Cook Yesterday at 11:08 pm

» Propellers?
by Ken Cook Yesterday at 10:53 pm

» Run video of my FT160 equipped Sbach 342
by oldguy Yesterday at 7:12 pm

» McCoy .35 RH ?
by oldguy Yesterday at 5:46 pm

» A little something I might need
by Mark Boesen Yesterday at 4:59 pm

Info
Cox Engine of The Month
August-2018
Mark Boesen's

"RR-TOO, Leo's handy work"


PAST WINNERS
Speed Contest 2018
CEF Traveling Engine
Win This Engine!
The Traveling Prop
Gallery


World of Aviation

Cowl vs prop size

Cox Engines Forum  :: Models and Modeling

Page 2 of 2 • Previous  1, 2

Go down

can`t hurt to try

Post  Jaspur_x on Wed Dec 28, 2011 4:25 am

I am just going by my limited experience here guys, 1 model with a cowl in all my years isn`t a lot of experience, my cowl is about 3/4" behind the prop, and only blocks about 1/3rd the prop.

The ww2 paratropers called it prop blast, so thats what I went with. Huh...
avatar
Jaspur_x
Banned

Posts : 710
Join date : 2011-04-22
Age : 45
Location : Shanksville,Pa, yes that flight 93 place

View user profile

Back to top Go down

Re: Cowl vs prop size

Post  Cribbs74 on Wed Dec 28, 2011 8:20 am

Ok,

I will try a .020 because it can't hurt but, I will pick up some Texaco pieces just in case.

avatar
Cribbs74
Moderator

Trusted Seller
Posts : 9774
Join date : 2011-10-24
Age : 44
Location : Tuttle, OK

View user profile

Back to top Go down

Re: Cowl vs prop size

Post  SuperDave on Wed Dec 28, 2011 8:30 am

JPvelo wrote:I say try it with the .020. Prop blast only happens when the model is standing still. Once in flight the "blast" matches forward velocity. The prop isn't pushing air backwards like a fan, it is pulling the aircraft forward due to it's airfoil cross section that creates "lift" in front of the aircraft.

Excellent post, JP! Welcome to the forum.
avatar
SuperDave
Top Poster
Top Poster

Posts : 3552
Join date : 2011-08-13
Location : Washington (state)

View user profile

Back to top Go down

Re: Cowl vs prop size

Post  microflitedude on Wed Dec 28, 2011 12:21 pm

SuperDave wrote:
JPvelo wrote:I say try it with the .020. Prop blast only happens when the model is standing still. Once in flight the "blast" matches forward velocity. The prop isn't pushing air backwards like a fan, it is pulling the aircraft forward due to it's airfoil cross section that creates "lift" in front of the aircraft.

Excellent post, JP! Welcome to the forum.

+1.

Very informative.
avatar
microflitedude
Top Poster
Top Poster

Trusted Seller
I Support My Forum

Posts : 3417
Join date : 2011-08-17
Age : 20
Location : Columbia, SC

View user profile https://www.facebook.com/MiniCub?fref=ts

Back to top Go down

Re: Cowl vs prop size

Post  049flyer on Tue Jun 06, 2017 8:11 pm

Baby Bee .049 puts out about the same power as your Tee Dee .020. Try the Baby Bee, it will swing a 6 inch prop easily and even a 7 inch.
avatar
049flyer
New Member
New Member

Posts : 1
Join date : 2014-06-28
Location : Tyler, TX

View user profile

Back to top Go down

Re: Cowl vs prop size

Post  RknRusty on Tue Jun 06, 2017 9:59 pm

Hi, 049flyer,
Welcome to CEF.... or welcome to posting, anyway. I see you joined a few years ago.
You've found a really old thread here, but Cribbs, the OP is online right now. I'm curious to see if you just gave him he answer he was looking for... 6 years later. Very Happy On Christmas day too.

_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!

My Hot Rock & Blues Playlist
avatar
RknRusty
Moderator

Posts : 10574
Join date : 2011-08-10
Age : 62
Location : South Carolina, USA

View user profile

Back to top Go down

Re: Cowl vs prop size

Post  Cribbs74 on Wed Jun 07, 2017 10:47 pm

Not so much, that project had been placed in storage after I picked up the handle. Knowing what I know now I would more than likely choose a different engine altogether.

I do appreciate the reply though and welcome to CEF!
avatar
Cribbs74
Moderator

Trusted Seller
Posts : 9774
Join date : 2011-10-24
Age : 44
Location : Tuttle, OK

View user profile

Back to top Go down

Re: Cowl vs prop size

Post  roddie on Thu Jun 08, 2017 2:35 pm

Cribbs74 wrote:Not so much, that project had been placed in storage after I picked up the handle. Knowing what I know now I would more than likely choose a different engine altogether.

I do appreciate the reply though and welcome to CEF!

It's cool when old threads like this one resurface. I remember having similar concerns with running a cowl on my 1st CEF Reed-Speed model. Coincidentally Ron... Laughing your model for that contest was............
avatar
roddie
Top Poster
Top Poster

Posts : 6001
Join date : 2013-07-17
Age : 58
Location : N. Smithfield, Rhode Island

View user profile http://www.stilburnin.com

Back to top Go down

Re: Cowl vs prop size

Post  Sponsored content


Sponsored content


Back to top Go down

Page 2 of 2 • Previous  1, 2

Back to top

- Similar topics

Cox Engines Forum  :: Models and Modeling

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