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

Logged in members see NO ADVERTISEMENTS!


Can a Tee See 049 spin a 1.5" spinner Cox_ba12




Can a Tee See 049 spin a 1.5" spinner Pixel

Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» Still don't get it.
by Scotland421 Today at 8:36 am

» Engine trade --- A Cox diesel engine for an Enya .049 custom built?
by sosam117 Yesterday at 8:50 pm

» When Everybody Flew with Spark Plugs or Diesels
by Ken Cook Yesterday at 2:25 pm

» Ordered a 1/2A Skyray kit
by TLAnderson Sun Jun 20, 2021 7:52 pm

» Follow Rusty's Memorial Traveling Engines!
by NEW222 Sun Jun 20, 2021 7:33 pm

» Ron's Baby Clown and It's Bladder System from a Few Years Ago!
by Yabby Sun Jun 20, 2021 3:17 pm

» How's the weather?
by Admin Sat Jun 19, 2021 11:14 am

» C-Clip pliers and the clutch connection
by rsv1cox Sat Jun 19, 2021 10:23 am

» Lightening a piston using common tools
by davidll1984 Fri Jun 18, 2021 10:03 am

» Hobby Air Products Multi Cylinder Cox Engines
by getback Fri Jun 18, 2021 9:02 am

» music vids.. some of your favorites
by getback Thu Jun 17, 2021 1:36 pm

» Yet another Killer Bee clone by Estes?
by davidll1984 Thu Jun 17, 2021 9:58 am

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


Can a Tee See 049 spin a 1.5" spinner Empty

Can a Tee See 049 spin a 1.5" spinner

Go down

Can a Tee See 049 spin a 1.5" spinner Empty Can a Tee See 049 spin a 1.5" spinner

Post  kevin king Sun Sep 27, 2020 7:08 pm

Does anybody know or ever tried using an RC type plastic 1.50" plastic spinner on a TD 049? Will the engine tolerate it? Or will the power loss be too much? Thanks.
kevin king
kevin king
Moderate Poster
Moderate Poster

Posts : 12
Join date : 2020-04-16

Back to top Go down

Can a Tee See 049 spin a 1.5" spinner Empty Re: Can a Tee See 049 spin a 1.5" spinner

Post  batjac Sun Sep 27, 2020 8:45 pm

Well, I’ve used a 1¼” on a TD, so why not?

The TC Mark
batjac
batjac
Diamond Member
Diamond Member

2019 Supporter

2020 Supporter

Posts : 1977
Join date : 2013-05-22
Age : 58
Location : Portland, OR, USA

Back to top Go down

Can a Tee See 049 spin a 1.5" spinner Empty Re: Can a Tee See 049 spin a 1.5" spinner

Post  Cribbs74 Sun Sep 27, 2020 9:10 pm

It will do it. Far from ideal though. How much does the spinner weigh?

I am horrible with math, but seems to me the weight would have more effect the further out it goes from the crank centerline.
Cribbs74
Cribbs74
Moderator

2019 Supporter

2020 Supporter

2021 Supporter

Posts : 11522
Join date : 2011-10-24
Age : 47
Location : Tuttle, OK

Back to top Go down

Can a Tee See 049 spin a 1.5" spinner Empty Re: Can a Tee See 049 spin a 1.5" spinner

Post  Tee Bee Mon Sep 28, 2020 11:47 pm

Sure it will spin it. But how fast? Who knows? Might be adequate depending on your mission. If you're a speed demon, forget it. Try it out and let us know. Laughing
Tee Bee
Tee Bee
Platinum Member
Platinum Member

2019 Supporter

2020 Supporter

Posts : 739
Join date : 2011-08-25
Location : Angleton, TX

Back to top Go down

Can a Tee See 049 spin a 1.5" spinner Empty Re: Can a Tee See 049 spin a 1.5" spinner

Post  KariFS Tue Sep 29, 2020 2:35 am

Might be a dumb question (still an honest one) but why would a spinner reduce the rpm?

If we assume it is balanced well enough, and not remarkably heavy, all I can think of is a minor flywheel effect that it may cause. Also some drag while flying obviously but a spinner is more aerodynamic than a bare engine without a spinner. A large spinner obviously covers part of the propeller blades but that should increase the rpm somewhat, right Huh...

Any input from the experts would be most welcome  Smile
KariFS
KariFS
Diamond Member
Diamond Member

Posts : 1770
Join date : 2014-10-10
Age : 49

Back to top Go down

Can a Tee See 049 spin a 1.5" spinner Empty Re: Can a Tee See 049 spin a 1.5" spinner

Post  Oldenginerod Tue Sep 29, 2020 2:44 am

@KariFS wrote:Might be a dumb question (still an honest one) but why would a spinner reduce the rpm?

If we assume it is balanced well enough, and not remarkably heavy, all I can think of is a minor flywheel effect that it may cause. Also some drag while flying obviously but a spinner is more aerodynamic than a bare engine without a spinner. A large spinner obviously covers part of the propeller blades but that should increase the rpm somewhat, right Huh...

Any input from the experts would be most welcome  Smile

Yes, my thoughts as well!  Huh...
Oldenginerod
Oldenginerod
Top Poster
Top Poster

Posts : 3361
Join date : 2012-06-15
Age : 58
Location : Drouin, Victoria

Back to top Go down

Can a Tee See 049 spin a 1.5" spinner Empty Re: Can a Tee See 049 spin a 1.5" spinner

Post  Tee Bee Tue Sep 29, 2020 2:56 am

I guess I should have been more specific. The larger spinner will blank out some of the prop, therefore possibly reducing some thrust with a resultant lower forward speed. As I mentioned, if speed isn’t a factor, it might work out just fine.
Tee Bee
Tee Bee
Platinum Member
Platinum Member

2019 Supporter

2020 Supporter

Posts : 739
Join date : 2011-08-25
Location : Angleton, TX

Back to top Go down

Can a Tee See 049 spin a 1.5" spinner Empty Re: Can a Tee See 049 spin a 1.5" spinner

Post  1/2A Nut Tue Sep 29, 2020 3:19 am

With Cox .010, .020 thru .051

additional heat
vibrations
ball socket wear
wear on the aluminum crankcase / slop over time
oversized cutouts for the blades will cause load

This is the only plastic spinner I would use with a Cox Reed .049, has proper cut outs with the right prop.

Fantastic low weight good fit opportunity:
I would like to have small cut outs to  custom fit the selected prop. The stud to be made
out of proper grade aluminum with plenty of threads to save weight out on the end of the crank.
Options for black and red / white shows dirt so just two other primary colors would be a plus.


Can a Tee See 049 spin a 1.5" spinner Cox_0412

Small Cox Logo  Thumbs Up
1/2A Nut
1/2A Nut
Top Poster
Top Poster

2019 Supporter

2021 Supporter

Posts : 3074
Join date : 2013-10-20
Age : 57
Location : Brad in Texas

Back to top Go down

Can a Tee See 049 spin a 1.5" spinner Empty Re: Can a Tee See 049 spin a 1.5" spinner

Post  KariFS Tue Sep 29, 2020 4:08 am

Thanks Tee Bee and ’Nut for your answers! I was thinking ”power = rpm”, but it is not that straightforward obviously. Thrust is what makes airplanes go, not rpm Very Happy
KariFS
KariFS
Diamond Member
Diamond Member

Posts : 1770
Join date : 2014-10-10
Age : 49

Back to top Go down

Can a Tee See 049 spin a 1.5" spinner Empty Re: Can a Tee See 049 spin a 1.5" spinner

Post  smooth_bill Tue Sep 29, 2020 6:22 am

Perhaps the reason for misunderstanding engine loading is the load variance while running is difficult to visualize? An IC engine actually has a power stroke and an exhaust stroke where the power (combustion) stroke accelerates the piston but the exhaust (pumping) stroke slows it down. A spinner or flywheel will load the engine (no matter how little) and cause a small loss of power.

I think we tend to forget this because they sound more like a turbine than a tiny IC engine. Very Happy

I never entered a model contest where speed or aerobatics was a goal but did use a few spinners on really hard to start engines so a starter could be used. Found out early on that plastic spinners were not up to the task.

Bill
smooth_bill
smooth_bill
Gold Member
Gold Member

2019 Supporter

2020 Supporter

2021 Supporter

Posts : 229
Join date : 2012-02-19
Age : 83
Location : Beaverton, OR

Back to top Go down

Can a Tee See 049 spin a 1.5" spinner Empty Re: Can a Tee See 049 spin a 1.5" spinner

Post  gkamysz Tue Sep 29, 2020 8:36 am

A spinner will have minimal impact on thrust. The center of the prop is particularly draggy, so a spinner will likely improve speed, but this really depends on the rest of the airframe. The outer 1/3 of the prop blade does 90% of the work.

The biggest issue with a large spinner on a small engine is getting it installed so it runs true and has the balance needed to run as fast as they do.

20 years ago I was flying electric racers with 4.75"-5" props in a 1.5" spinner at ~30+kRPM on a motor with a 1/8" shaft and it went over 150MPH.
gkamysz
gkamysz
Gold Member
Gold Member

Posts : 209
Join date : 2018-02-22
Location : Chicagoland

Back to top Go down

Can a Tee See 049 spin a 1.5" spinner Empty Re: Can a Tee See 049 spin a 1.5" spinner

Post  kevin king Tue Sep 29, 2020 12:49 pm

Thanks for the input gentlemen. I think I will revamp the plane around the yellow Cox spinner. The plane will be smaller and lighter.👍


Last edited by kevin king on Tue Sep 29, 2020 10:03 pm; edited 1 time in total
kevin king
kevin king
Moderate Poster
Moderate Poster

Posts : 12
Join date : 2020-04-16

Back to top Go down

Can a Tee See 049 spin a 1.5" spinner Empty Re: Can a Tee See 049 spin a 1.5" spinner

Post  kevin king Tue Sep 29, 2020 1:05 pm


.
kevin king
kevin king
Moderate Poster
Moderate Poster

Posts : 12
Join date : 2020-04-16

Back to top Go down

Can a Tee See 049 spin a 1.5" spinner Empty Re: Can a Tee See 049 spin a 1.5" spinner

Post  badbill Wed Sep 30, 2020 10:17 am

Just so you know, the outside 10% of the prop puts out the majority of the thrust. That's why planes with big radial cowls don't suffer much, and also why larger spinners don't take away any significant amount of thrust.
badbill
badbill
Gold Member
Gold Member

Posts : 302
Join date : 2015-08-13
Age : 64
Location : Centerville, Georgia

Back to top Go down

Can a Tee See 049 spin a 1.5" spinner Empty Re: Can a Tee See 049 spin a 1.5" spinner

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