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!


Schnuerle ported 049s Babe_b10
Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» Carl Goldberg Skylane 42
by NEW222 Today at 9:48 pm

» Late Find Possible Meteor Shower Thursday November 21
by NEW222 Today at 9:18 pm

» Hidden Gem Finds
by DrCox Today at 9:13 pm

» How to remove those stuck cylinders
by DrCox Today at 8:56 pm

» Lookie Here
by NEW222 Today at 8:45 pm

» Kinner Sportster
by Ricksrod Today at 8:20 pm

» Piston/rod...
by getback Today at 7:37 pm

» How (not) to sell model engines
by getback Today at 7:32 pm

» Sig Deweybird 1/2A
by ticomareado Today at 7:19 pm

» Screws For Engines
by dckrsn Today at 4:51 pm

Cox Engine of The Month
November-2019
jmcalata's

"Pee Wee .020 throttled combinated"



PAST WINNERS
CEF Traveling Engine

Win This Engine!
The Traveling Prop
Gallery


Schnuerle ported 049s Empty
World of Aviation

Schnuerle ported 049s

Go down

Schnuerle ported 049s Empty Schnuerle ported 049s

Post  glidermartin on Thu Nov 01, 2018 2:33 am

Does anyone have performance data on the Schnuerle ported version of the TD049 that was marketed by Kustom Kraftsmanship?
glidermartin
glidermartin
New Member
New Member

Posts : 1
Join date : 2018-11-01

Back to top Go down

Schnuerle ported 049s Empty Re: Schnuerle ported 049s

Post  Marleysky on Thu Nov 01, 2018 11:46 am

glidermartin wrote:Does anyone have performance data on the Schnuerle ported version of the TD049 that was marketed by Kustom Kraftsmanship?

Hey Gliderman, Welcome to the CEF!  Scepter Flight shows a couple of tests on the TD. 049.  I guess here is where I learn something: Td is front rotary intake, vs the Bee’s reed valve.  Not sure what Schnuerle porting means

Start here:   http://sceptreflight.net/Model%20Engine%20Tests/Cox%20Tee%20Dee%20049.html

Then Here:
http://sceptreflight.com/Model%20Engine%20Tests/Cox%20Tee%20Dee%20049%20%282%29.html


Last edited by Marleysky on Thu Nov 01, 2018 11:52 am; edited 1 time in total (Reason for editing : 2nd report)
Marleysky
Marleysky
Diamond Member
Diamond Member

2019 Supporter

Posts : 2416
Join date : 2014-09-28
Age : 67
Location : Grand Rapids, MI

Back to top Go down

Schnuerle ported 049s Empty Re: Schnuerle ported 049s

Post  gkamysz on Thu Nov 01, 2018 12:04 pm

He's referring to this engine. https://www.ebay.com/itm/382610803708

I have never read anything about these engines. I wonder how many were made.
gkamysz
gkamysz
Gold Member
Gold Member

Posts : 133
Join date : 2018-02-22
Location : Chicagoland

Back to top Go down

Schnuerle ported 049s Empty Re: Schnuerle ported 049s

Post  GallopingGhostler on Thu Nov 01, 2018 4:02 pm

Marleysky wrote:Hey Gliderman, Welcome to the CEF!
Agreed, welcomed Gliderman to the forum! Thumbs Up

Marleysky wrote:Scepter Flight shows a couple of tests on the TD. 049. I guess here is where I learn something: Td is front rotary intake, vs the Bee’s reed valve. Not sure what Schnuerle porting means.

For Schneurle porting see: revolvy.com: Schnuerle Porting

It was a way for improvement on the other porting systems, did away with the piston baffle on cross scavenged ported engines. The Tee Dee dual porting system with SPI, without piston baffle and various tweaks was IMO also efficient, why Cox was competitive for a long time since the early 1960's. Sometimes I wonder if with the inside of the cylinder chromed and a lighter aluminum piston would have improved performance further.

3rd port where the old Tee Dee exhaust port was would improve swirling of the fuel-air mixture I imagine. Cox was on its way to Schneurle ported engines with is Conquest series, but foreign competition and lack of sufficient importation tariffs to level the playing field led to the demise of nearly all US model engine production facilities. I imagine that the smaller engines would have followed suit in the Conquest series, too.
That would have been an exciting development but alas never happened. Anyway, my 2 cents. Pumpkin Computer Issues Popcorn drunken Beer Cheers
GallopingGhostler
GallopingGhostler
Diamond Member
Diamond Member

Posts : 2129
Join date : 2013-07-13
Age : 65
Location : Clovis, New Mexico

Back to top Go down

Schnuerle ported 049s Empty Re: Schnuerle ported 049s

Post  Cribbs74 on Thu Nov 01, 2018 4:41 pm

I doubt you will come up with any performance stats on the KK engine as they were a custom thing. If you can find when Dale Kirn was producing them you may be able to look at old model mags for a run down.

I can’t imagine that they were a really big improvement over the standard porting as the ports would have been smaller than stock unless intake and crank work was done along with adding the third port.  Then there is the exhaust dilemma as where there was two there is now only one. It’s a fine line between too much in and not enough out. Although I have read numerous times that 2 exhaust ports on the Cox engine was overkill, so maybe it could still flow well with 3 intake and one exhaust port. Norvel engines run that configuration I believe and perform very well.

The TD Special .15 MKII has the 3 port and one exhaust configuration and it runs about 500-1K rpm over the regular .15 Special. If my memory serves that is. I have both and remember taching them using the same prop and fuel.

I too would be interested in hearing about how they performed.

Good Luck!

Ron
Cribbs74
Cribbs74
Moderator

2019 Supporter

Trusted Seller
Posts : 10562
Join date : 2011-10-24
Age : 45
Location : Tuttle, OK

Back to top Go down

Schnuerle ported 049s Empty Re: Schnuerle ported 049s

Post  GallopingGhostler on Thu Nov 01, 2018 10:54 pm

You have a good point, Ron. What I see is the limitation of the Cox cylinder. The bypass ports are rather shallow to retain sufficient strength to the cylinder. To deepen them would require a thicker liner. The milling process was developed for high speed production at lowest cost. I think it was the law of diminishing returns. There's not much more that could be done with the existing design for further improvement except start over with a totally new one.

Then too, there were failures along the way. We'd hoped for a much improved .074 when the Queen Bee arrived. Alas it was a reedy that was heavy, required special motor mounting and with the same power as the smaller Tee Dee .049.
GallopingGhostler
GallopingGhostler
Diamond Member
Diamond Member

Posts : 2129
Join date : 2013-07-13
Age : 65
Location : Clovis, New Mexico

Back to top Go down

Schnuerle ported 049s Empty Re: Schnuerle ported 049s

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