Log in
Search
Latest topics
» Golden Bee basic running problemby roddie Yesterday at 10:51 pm
» Simple Gliders
by rdw777 Yesterday at 6:25 pm
» Foam hand kids glider converted to 0.049 CL
by rdw777 Yesterday at 6:11 pm
» Weird search for a single comic from an old Mad Magazine
by Kim Yesterday at 1:44 pm
» Scientific "Zipper" Build...Zipper Flys!.
by getback Yesterday at 7:27 am
» Cox .049 Tee Dee engines back in stock (limited availablility)
by GallopingGhostler Yesterday at 1:05 am
» Very off-topic.........Time passes and not always for the best......
by rsv1cox Thu Jul 25, 2024 2:47 pm
» Roddie-Rigger.. a 2005 original design
by roddie Wed Jul 24, 2024 11:48 pm
» Jim Walker Bonanza etc.
by rsv1cox Wed Jul 24, 2024 6:30 pm
» Throttles for Cox Tee Dee .049 / .020 / .010 engines --- videos
by sosam117 Wed Jul 24, 2024 8:54 am
» Introducing our Cox .049 TD Engines
by Admin Tue Jul 23, 2024 2:00 am
» Project Cox .049 r/c & Citabrian Champion
by getback Mon Jul 22, 2024 4:14 pm
Cox Engine of The Month
July-2024
robot797's
![](https://i.servimg.com/u/f95/15/46/86/41/3_robo10.jpg)
"ULTIMITE COX 010: it has a clutch, E starter, throttle, exhaust, aluminum tank, aluminum venturi, gearbox with forward and reverse, and now its on a custom drawn and printed stand"
![](https://i.servimg.com/u/f95/15/46/86/41/sponso12.png)
PAST WINNERS
robot797's
![](https://i.servimg.com/u/f95/15/46/86/41/3_robo10.jpg)
"ULTIMITE COX 010: it has a clutch, E starter, throttle, exhaust, aluminum tank, aluminum venturi, gearbox with forward and reverse, and now its on a custom drawn and printed stand"
![](https://i.servimg.com/u/f95/15/46/86/41/sponso12.png)
PAST WINNERS
Got my Norvel 049 running
Page 2 of 2
Page 2 of 2 • 1, 2
Re: Got my Norvel 049 running
https://www.youtube.com/watch?v=PhVMZCJeos4
I can confirm:
24,224 once and 24,144 once 23k+ many times and level flight 21,478 just a slight nose down and it would be in the 22k+ range.
I can confirm:
24,224 once and 24,144 once 23k+ many times and level flight 21,478 just a slight nose down and it would be in the 22k+ range.
![Flying](/users/3015/29/34/60/smiles/4201307885.gif)
1/2A Nut- Top Poster
- Posts : 3464
Join date : 2013-10-20
Age : 60
Location : Brad in Texas
Re: Got my Norvel 049 running
Guys, couple things...
For comparison, here's the results of Ron's TD Tach Race a couple years ago (Cox Comp grey 5x3 and 25% nitro.049/.051 stock class)
Paul G. 19,780
Kim S. 19,440
Jason B. 19,410
John Boy 18,890 and 18,840
EME (Matt) 18,150 and 17,580
-The prop in question is not a Cox Competition prop, its a re-pop of the early 5x3 Thimble-Drone prop, not nearly as efficient and nowhere near the load as the Competition version, so its gonna turn more RPM.
-Second the RPM claims are unloaded (inflight) reading from a cel phone app., not bench numbers, unloaded RPM (flight) is somewhere around 10-20% higher then bench.
![Got my Norvel 049 running - Page 2 00310](https://i.servimg.com/u/f59/16/86/26/46/00310.jpg)
For comparison, here's the results of Ron's TD Tach Race a couple years ago (Cox Comp grey 5x3 and 25% nitro.049/.051 stock class)
Paul G. 19,780
Kim S. 19,440
Jason B. 19,410
John Boy 18,890 and 18,840
EME (Matt) 18,150 and 17,580
-The prop in question is not a Cox Competition prop, its a re-pop of the early 5x3 Thimble-Drone prop, not nearly as efficient and nowhere near the load as the Competition version, so its gonna turn more RPM.
-Second the RPM claims are unloaded (inflight) reading from a cel phone app., not bench numbers, unloaded RPM (flight) is somewhere around 10-20% higher then bench.
![Got my Norvel 049 running - Page 2 00310](https://i.servimg.com/u/f59/16/86/26/46/00310.jpg)
Re: Got my Norvel 049 running
Rusty, Mark, Kris and others,
thanks, I am not pretending to be an expert - simply a Coxaholic - but I gauged the phone app with the Hobbyco minitach and they show the same readings.
I do not necessarily want to convince anyone, these are my continued observations with many of my old-stock TEE Dee-s be it a 010, 020, 049, or 051 and I am quite happy with that. Unfortunately but understandably the non-SPI 050 with the silencer is a bit tamer.
I did not want to stir controversy but i am convinced TeeDee-s are one of their best if not the best in their class, and even though the design is 50+ years old, the pre-Estes quality is unsurpassable...
How on earth a piston-cylinder set with no rings can maintain such a close fit after so many hot runs, let alone the conrod balljoint that I reset only once, can only be explained by the sheer fact it was made by COX in the good old days.
The engines I have on benchmark are all lower in quality and longevity: Moki (the old-school Hungarian made ones), MK, Webra, OS Max, and of course the NV.
thanks, I am not pretending to be an expert - simply a Coxaholic - but I gauged the phone app with the Hobbyco minitach and they show the same readings.
I do not necessarily want to convince anyone, these are my continued observations with many of my old-stock TEE Dee-s be it a 010, 020, 049, or 051 and I am quite happy with that. Unfortunately but understandably the non-SPI 050 with the silencer is a bit tamer.
I did not want to stir controversy but i am convinced TeeDee-s are one of their best if not the best in their class, and even though the design is 50+ years old, the pre-Estes quality is unsurpassable...
How on earth a piston-cylinder set with no rings can maintain such a close fit after so many hot runs, let alone the conrod balljoint that I reset only once, can only be explained by the sheer fact it was made by COX in the good old days.
The engines I have on benchmark are all lower in quality and longevity: Moki (the old-school Hungarian made ones), MK, Webra, OS Max, and of course the NV.
balogh- Top Poster
Posts : 4803
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
Re: Got my Norvel 049 running
Mark Boesen wrote:Guys, couple things...
-The prop in question is not a Cox Competition prop, its a re-pop of the early 5x3 Thimble-Drone prop, not nearly as efficient and nowhere near the load as the Competition version, so its gonna turn more RPM.
Place of commercial here :http://coxengines.ca/cox-.049-propeller-5-x-4.html
(Bernie, how about some sales commission for me? :-) )
balogh- Top Poster
Posts : 4803
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
Re: Got my Norvel 049 running
Being that I got an entry level smart phone with a Windows 8 OS, I can find no audio app to tach an engine, Next September when my contract is up I will get a more widely used Droid so I can get such an app and get some readings on my in flight RPMs.I've always been curious, so for now I can just add 15% to the launch RPM.
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
Re: Got my Norvel 049 running
Hi Guys. Thank you for all the info.
Balogh and Surfer_Kris. Thanks for the figures and advice. You guys have some serious fast engines.
I will try and have a look at the screw and see while running if it makes a difference to turn it.
I must mention that I am using 20% nitro. But the biggest issue is my altitude. We are 1967meters (6454feet) above sea level, so that is already taking a big bite out of the performance of my engines.
Thanks for the info on the prop Rusty. When I saw how mine run with the master airscrew, I was also sure it is to much prop for it. I will cut it down to a 5x3 and see what it does.
Thanks again guys, I will report back once I have checked and tested a few things that you guys have proposed.
Theo
Balogh and Surfer_Kris. Thanks for the figures and advice. You guys have some serious fast engines.
I will try and have a look at the screw and see while running if it makes a difference to turn it.
I must mention that I am using 20% nitro. But the biggest issue is my altitude. We are 1967meters (6454feet) above sea level, so that is already taking a big bite out of the performance of my engines.
Thanks for the info on the prop Rusty. When I saw how mine run with the master airscrew, I was also sure it is to much prop for it. I will cut it down to a 5x3 and see what it does.
Thanks again guys, I will report back once I have checked and tested a few things that you guys have proposed.
Theo
Theo Kleynhans- Gold Member
- Posts : 196
Join date : 2013-12-30
Age : 42
Location : South Africa
Re: Got my Norvel 049 running
https://play.google.com/store/apps/details?id=com.javiery.rpmgauge
This RPM App works
1/2A Nut- Top Poster
- Posts : 3464
Join date : 2013-10-20
Age : 60
Location : Brad in Texas
Re: Got my Norvel 049 running
Yeah for Android. I have yet to find one for my Windows phone. maybe I should look for one for my PC desktop.
Rusty
Rusty
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
Re: Got my Norvel 049 running
Theo Kleynhans wrote:Hi Guys. Thank you for all the info.
Balogh and Surfer_Kris. Thanks for the figures and advice. You guys have some serious fast engines.
I will try and have a look at the screw and see while running if it makes a difference to turn it.
I must mention that I am using 20% nitro. But the biggest issue is my altitude. We are 1967meters (6454feet) above sea level, so that is already taking a big bite out of the performance of my engines.
Thanks for the info on the prop Rusty. When I saw how mine run with the master airscrew, I was also sure it is to much prop for it. I will cut it down to a 5x3 and see what it does.
Thanks again guys, I will report back once I have checked and tested a few things that you guys have proposed.
Theo
Theo, you can compensate a little by opening up the venturi to allow it to breath better. Higher nitro should help as it brings it's own oxygen. 4 pitch props will probably be your go to for the Cox engines.
Ron
Cribbs74- Moderator
Posts : 11904
Join date : 2011-10-24
Age : 50
Location : Tuttle, OK
Re: Got my Norvel 049 running
1/2A Nut wrote:
https://play.google.com/store/apps/details?id=com.javiery.rpmgauge
This RPM App works
Pree-tty cool! I had this on my last phone and didn't really use it much as it didn't seem to work very well, just down loaded it on my S5 and its seems to work pretty well, at least taching speakers! I do wonder how an audio tach is affected by the "doppler effect" of sound coming and going?
![Got my Norvel 049 running - Page 2 20141110](https://i.servimg.com/u/f59/16/86/26/46/20141110.jpg)
Re: Got my Norvel 049 running
Exactly the same gear on my side: Samsung S5 and Hobbyco minitach, with identical reading results...I hope this lends me and my TeeDee051 rpm accoustic readings some confidence....
balogh- Top Poster
Posts : 4803
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
Re: Got my Norvel 049 running
I think it does as far as "bench" readings go, but I'm not sure of unloaded inflight readings and if the "doppler effect" has any effect on the readings since its the audio the tach is picking up?
Also remember the prop your using doesn't have near the load as the Competition 5x3 prop has and because of that it should have higher readings.
That's what I like about the Tach Race, all engines are run with the same prop, same fuel and same temp on the same day.
Also remember the prop your using doesn't have near the load as the Competition 5x3 prop has and because of that it should have higher readings.
That's what I like about the Tach Race, all engines are run with the same prop, same fuel and same temp on the same day.
Re: Got my Norvel 049 running
Here is a reading I made on a tach measurement on youtube:
![Got my Norvel 049 running - Page 2 Acouta10](https://i.servimg.com/u/f59/17/75/42/39/acouta10.jpg)
I agree the Doppler effect may falsify accoustic readings. But if you go back to my vid yesterday when I tached my TD051 based on its sound recorded on a keychain camera mounted on the plane, the Doppler effect is not there because the camera recording the sound and the plane fly together. And on that vid I measured 24k with the acoustic tach of my Samsung S5 which is now proven to be measuring the same as a Hobbico minitach.
(The Doppler efffect is only there if you stand with the acoustic tach in your hands and the plane flies towards/away from you.)
Ergo, the engine spins 24k and the measurement is exact.
I also agree the commercially available 5x4 prop may not require such a torque as a competition prop of the same nominal dimensions. BTW, where do you guys buy competition nprops?
![Got my Norvel 049 running - Page 2 Acouta10](https://i.servimg.com/u/f59/17/75/42/39/acouta10.jpg)
I agree the Doppler effect may falsify accoustic readings. But if you go back to my vid yesterday when I tached my TD051 based on its sound recorded on a keychain camera mounted on the plane, the Doppler effect is not there because the camera recording the sound and the plane fly together. And on that vid I measured 24k with the acoustic tach of my Samsung S5 which is now proven to be measuring the same as a Hobbico minitach.
(The Doppler efffect is only there if you stand with the acoustic tach in your hands and the plane flies towards/away from you.)
Ergo, the engine spins 24k and the measurement is exact.
I also agree the commercially available 5x4 prop may not require such a torque as a competition prop of the same nominal dimensions. BTW, where do you guys buy competition nprops?
balogh- Top Poster
Posts : 4803
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
Re: Got my Norvel 049 running
RknRusty wrote:Run Cox Run!
I'd like to know what my Tee Dee .049 is turning with Microflitedude flying it on 25% Beta test Cox Super Power Fuel this past Sunday. Of course you'd have to average due to doppler effect. That's an MA 5.25x3 prop.
https://youtu.be/EKV9cDuHLJM
Rusty,
I tached 22k on your 049 when the plane flew nearest to the camera i.e. neither approaching nor departing from it i.e when the Doppler effect was minimal.
balogh- Top Poster
Posts : 4803
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
Re: Got my Norvel 049 running
Sometimes even 23k...
balogh- Top Poster
Posts : 4803
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
Re: Got my Norvel 049 running
lol, I got low 22's as well!
http://coxengines.ca/cox-.049-propeller-grey-5-x-3.html
http://coxengines.ca/cox-.049-propeller-grey-5-x-3.html
Re: Got my Norvel 049 running
![lol!](https://2img.net/i/fa/i/smiles/lol.gif)
I am afraid that while we were debating enthusiastically defending our beliefs, we have just invented the warm water...but it was a good debate, I liked it and hope not to have offended anyone with my notorious promotion of the COX TD051 merits...
Next time I am in the US I will make sure to have a couple beers with you guys...just meet me in a place with authentic live blues music, instrumental, with as much nerve-ripping harmonica in it as possible...and I will have my 051 with me just to further tease you all with its brute performance
![Laughing](https://2img.net/i/fa/i/smiles/icon_lol.gif)
balogh- Top Poster
Posts : 4803
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
Re: Got my Norvel 049 running
[quote="Cribbs74
Theo, you can compensate a little by opening up the venturi to allow it to breath better. Higher nitro should help as it brings it's own oxygen. 4 pitch props will probably be your go to for the Cox engines.
Ron[/quote]
I was always wondering if the charge of the engines like TD-s and NV-s with their venturi inclined towards (but not pointing fully into) the prop could be enhanced by mounting a funnel extension on the venturi, pointing right into the plan of the prop? Kinda compressor-charging?
Anyone has seen/done something like that?
Theo, you can compensate a little by opening up the venturi to allow it to breath better. Higher nitro should help as it brings it's own oxygen. 4 pitch props will probably be your go to for the Cox engines.
Ron[/quote]
I was always wondering if the charge of the engines like TD-s and NV-s with their venturi inclined towards (but not pointing fully into) the prop could be enhanced by mounting a funnel extension on the venturi, pointing right into the plan of the prop? Kinda compressor-charging?
Anyone has seen/done something like that?
balogh- Top Poster
Posts : 4803
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
Re: Got my Norvel 049 running
Look in the Reed Speed discussions. I think Jim and/or Roddie made a forward facing ram air scoop, but that's a reedy, not a rotary valve, so I wonder if too much ram air could conceivably float the reed.
Rusty
Rusty
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
Page 2 of 2 • 1, 2
![-](https://2img.net/i/empty.gif)
» Cranking and running Norvel engines
» Older Norvel AME 061 running trouble
» Norvel pre-revlite, bench running numbers
» Glow Plug Norvel .074 / Turbo Head Norvel .074
» 010 running
» Older Norvel AME 061 running trouble
» Norvel pre-revlite, bench running numbers
» Glow Plug Norvel .074 / Turbo Head Norvel .074
» 010 running
Page 2 of 2
Permissions in this forum:
You cannot reply to topics in this forum