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by 1/2A Nut Sat Jun 25, 2022 11:01 pm

Cox Engine of The Month
June-2022
balogh's

"COX Tee Dee .051 on duty"



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Post  1/2A Nut Sun Jun 12, 2022 7:22 pm

The trick is to post the link using the youtube tab to display a vid on CEF.



Well done, more power today with the TD!

Small Cox Logo  Thumbs Up

Top tip-
Set NV peak rpm with the plane level when using synthetic oil.
The steel on steel piston / cylinder overheats fast causing a on the
ground peak needle to be richer than needed in the air. Nose high
settings are not needed due to the thermal max state of synthetic oil.
With synthetic if the flight was rich lean the needle a bit, then start up
do not touch the needle quickly launch the plane before the engine reaches
top ground thermal state. The steel piston / sleeve will warm up quickly but
not die with the leaner setting on the ground if you launch soon as enough rpm
is being made. In the air the NV will be much closer to a good peak rpm setting.

Only castor can provide a better leaner peak needle on the ground with
moderate cooling changes in the air for a fuel mix that is only compensating
for the additional gain in unloaded rpm while flying. The engine more often
sings with steady top possible rpm in flights - not just by chance.

The art of a getting top rpm is understanding the imposed loading conditions on
the engine / design attributes and the effect of the fuel mix type / flight NV setting.

Can increase top end speed with back-cut on the CAM 4x3 prop while retaining some
of the thrust the 4 inch diameter prop provides.

Cox PeeWee Micro Speeder - Page 2 20220610


Small Cox Logo  Thumbs Up


Last edited by 1/2A Nut on Sun Jun 12, 2022 9:27 pm; edited 2 times in total
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Post  Woody Sun Jun 12, 2022 8:32 pm

1/2A Nut wrote:The trick is to post the link using the youtube tab to display a vid on CEF.



More power today with the TD!

Small Cox Logo  Thumbs Up

Top tip-
Set NV peak rpm with the plane level when using synthetic oil.
The steel on steel piston / cylinder overheats fast causing a on the
ground peak needle to be richer than needed in the air. Nose high
settings are not needed due to the thermal max state of synthetic oil.
With synthetic if the flight was rich lean the needle a bit, then start up
do not touch the needle quickly launch the plane before the engine reaches
top ground thermal state, the steel piston / sleeve will warm up quickly but
not die with the leaner setting on the ground. In the air the NV will be much
closer to a good peak rpm setting.

Only castor can provide a better leaner peak needle on the ground with
moderate cooling changes in the air for a fuel mix that is only compensating
for the additional gain in unloaded rpm while flying. The engine more often
sings with steady top possible rpm in flights - not just by chance.

The art of a getting top rpm is understanding the imposed loading conditions on
the engine / design attributes and the effect of the fuel mix type / flight NV setting.

Can increase top end speed with back-cut on the CAM 4x3 prop while retaining some
of the thrust the 4 inch diameter prop provides.

Cox PeeWee Micro Speeder - Page 2 20220610


Small Cox Logo  Thumbs Up
I am trying to take this all in.
You certainly know your onions! ref fuel, settings and fuel mix.
The flying proves it.
so .....are you running it on pure synthetic?
I ask because 30 mins ago I just mixed up some fuel and added castor to the mix.
The ready fuel had 15% synth so I brought it up to 20% with a 5% castor addition.
Is that okay to protect the engine?
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Post  1/2A Nut Sun Jun 12, 2022 9:23 pm

Thank you Woody, for Cox engines I use premix 19% castor 2% synthetic.

Would be ok with a custom mix of 17% castor 5% synthetic to help flush more of the castor from the engine.

Small Cox Logo  Thumbs Up
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Post  Woody Sun Jun 12, 2022 9:31 pm

1/2A Nut wrote:Thank you Woody, for Cox engines I use premix 19% castor 2% synthetic.

Would be ok with a custom mix of 17% castor 5% synthetic to help flush more of the castor from the engine.

Small Cox Logo  Thumbs Up
Crickey...I am severely UN castored then.
Thanks for getting back.
You have just saved my engine!
Your Tee Dee is the Bees Knees!!!
It really is tops.
So is your flying.
I could never fly like that.
Too old!!... But beautiful to watch others do it.
I have to Bee contented with my Q Tee which I just ran up ready for a flight somewhen.
woody
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Post  Tobaiies Mon Jun 13, 2022 5:46 am

1/2A Nut wrote:The trick is to post the link using the youtube tab to display a vid on CEF.



Well done, more power today with the TD!

Small Cox Logo  Thumbs Up

Top tip-
Set NV peak rpm with the plane level when using synthetic oil.
The steel on steel piston / cylinder overheats fast causing a on the
ground peak needle to be richer than needed in the air. Nose high
settings are not needed due to the thermal max state of synthetic oil.
With synthetic if the flight was rich lean the needle a bit, then start up
do not touch the needle quickly launch the plane before the engine reaches
top ground thermal state. The steel piston / sleeve will warm up quickly but
not die with the leaner setting on the ground if you launch soon as enough rpm
is being made. In the air the NV will be much closer to a good peak rpm setting.

Only castor can provide a better leaner peak needle on the ground with
moderate cooling changes in the air for a fuel mix that is only compensating
for the additional gain in unloaded rpm while flying. The engine more often
sings with steady top possible rpm in flights - not just by chance.

The art of a getting top rpm is understanding the imposed loading conditions on
the engine / design attributes and the effect of the fuel mix type / flight NV setting.

Can increase top end speed with back-cut on the CAM 4x3 prop while retaining some
of the thrust the 4 inch diameter prop provides.

Cox PeeWee Micro Speeder - Page 2 20220610


Small Cox Logo  Thumbs Up
thanks for the awesome help!
Didn't find the option to insert the youtube video on the phone. Will try that with the propeller!


Last edited by Tobaiies on Mon Jun 13, 2022 3:50 pm; edited 1 time in total
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Post  Tobaiies Mon Jun 13, 2022 5:56 am

Woody wrote:That was a good build log.
It flies real fast.
Should be called Ding Bat!!!
Congratulations on a great little model and also your flying skills.
At that speed you cannot afford to get disorientated.
The engine was nice as well. ( the full monte )
Thanks!
Good idea with the name, for the next one Very Happy
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Post  Tobaiies Tue Jun 14, 2022 3:57 pm

Here are a few first pictures of the new model. Eyebrows
The wingspan is slightly smaller, 50cm.
The tail unit has also shrunk a bit.
The servo for the ailerons is nicely recessed. Smile
Cox PeeWee Micro Speeder - Page 2 Image013
Cox PeeWee Micro Speeder - Page 2 Image011
Cox PeeWee Micro Speeder - Page 2 Image012Cox PeeWee Micro Speeder - Page 2 Image014
Cox PeeWee Micro Speeder - Page 2 Image015
Cox PeeWee Micro Speeder - Page 2 Image017
Cox PeeWee Micro Speeder - Page 2 Image016
Cox PeeWee Micro Speeder - Page 2 Image018
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Post  1/2A Nut Wed Jun 15, 2022 12:13 am

Well done Tobaiies!

Small Cox Logo RC Plane Small Cox Logo Popcorn Thumbs Up Fireworks
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Post  Woody Wed Jun 15, 2022 2:36 am

Its looking good mate.
See youve gone for balsa not ply this time on the fuse.
It will be fast. Hey hey!!!
You are a good builder.
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Post  Tobaiies Wed Jun 15, 2022 3:33 pm

Here it is, "Dingbat Speed"!
It flies quite well, but more aggressively than the first version.
I need to put the center of gravity back a bit.
I was able to fly it after heavy rain and hail RC Plane
Cox PeeWee Micro Speeder - Page 2 Image021
Cox PeeWee Micro Speeder - Page 2 Image019
Cox PeeWee Micro Speeder - Page 2 Image020

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Post  Woody Wed Jun 15, 2022 7:33 pm

Its a cracker.
Deffo a Dingbat!!!.
FWIW....on yer next fuse try rounding the nose to match the fuel tank diameter just to get that little bit more less drag?
On the inside of the fuse at the nose, glue in four triangular bits so that you can then sand the corners away?
Only a suggestion.
You are more expert than me with a world record toboot?
I wish my reactions were fast enough otherwise I would build one.
I fly DEAD bats!!!!.
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Post  1/2A Nut Thu Jun 16, 2022 12:54 am

-How much weight ready to fly?
-What is the wing span?

Well done, much better thrust to weight / improving rpm.
Up to 29,063 rpm brief peak pass 83 mph prop pitch speed / 134 kph.

With the current prop the engine can produce more rpm using a
ridged aluminum mount and turbo plug.

Can move the CG back using a radial mount.
Kamtechnik radial mount needs a 10 to 15ml nylon fuel bottle.
https://kamtechnik.com/product/ktk-02/

Allows a smaller fuselage firewall - dependent on fuel tank diameter.
Cox PeeWee Micro Speeder - Page 2 Imag7211

Turbo plug adapter
https://kamtechnik.com/product/ktk-12/

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Post  Tobaiies Thu Jun 16, 2022 1:59 pm

Woody wrote:Its a cracker.
Deffo a Dingbat!!!.
FWIW....on yer next fuse try rounding the nose to match the fuel tank diameter just to get that little bit  more less drag?
On the inside of the fuse at the nose, glue in four triangular bits so that you can then sand the corners away?
Only a suggestion.
You are more expert than me with a world record toboot?
I wish my reactions were fast enough otherwise I would build one.
I fly DEAD bats!!!!.
Thanks!
I thought of that at first, but completely forgot about it while building it. drunken Mad
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Post  Tobaiies Thu Jun 16, 2022 2:03 pm

1/2A Nut wrote:-How much weight ready to fly?
-What is the wing span?

Well done, much better thrust to weight / improving rpm.
Up to 29,063 rpm brief peak pass 83 mph prop pitch speed / 134 kph.

With the current prop the engine can produce more rpm using a
ridged aluminum mount and turbo plug.

Can move the CG back using a radial mount.
Kamtechnik radial mount needs a 10 to 15ml nylon fuel bottle.
https://kamtechnik.com/product/ktk-02/

Allows a smaller fuselage firewall - dependent on fuel tank diameter.
Cox PeeWee Micro Speeder - Page 2 Imag7211

Turbo plug adapter
https://kamtechnik.com/product/ktk-12/

Small Cox Logo  Thumbs Up
RTF weight: 82g
Wingspan: 50cm
I'll order something from kamtechnik! I've heard about it before.
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Post  Woody Thu Jun 16, 2022 9:11 pm

Tobaiies wrote:
Woody wrote:Its a cracker.
Deffo a Dingbat!!!.
FWIW....on yer next fuse try rounding the nose to match the fuel tank diameter just to get that little bit  more less drag?
On the inside of the fuse at the nose, glue in four triangular bits so that you can then sand the corners away?
Only a suggestion.
You are more expert than me with a world record toboot?
I wish my reactions were fast enough otherwise I would build one.
I fly DEAD bats!!!!.
Thanks!
I thought of that at first, but completely forgot about it while building it. drunken Mad
If you so feel inclined Outer Zone plans would love this one.
Its a husband and wife offer to all modellers to gain free plans and I personally like to give back so it helps them and us.
You don't have to tell them your secrets of tuning.
That is undersatandable and okay.
Just the basic airframe with as much as you want to add.
The experienced flyers will love it.
Woody
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Post  Tobaiies Fri Jun 17, 2022 4:37 pm

Woody wrote:
Tobaiies wrote:
Woody wrote:Its a cracker.
Deffo a Dingbat!!!.
FWIW....on yer next fuse try rounding the nose to match the fuel tank diameter just to get that little bit  more less drag?
On the inside of the fuse at the nose, glue in four triangular bits so that you can then sand the corners away?
Only a suggestion.
You are more expert than me with a world record toboot?
I wish my reactions were fast enough otherwise I would build one.
I fly DEAD bats!!!!.
Thanks!
I thought of that at first, but completely forgot about it while building it. drunken Mad
If you so feel inclined Outer Zone plans would love this one.
Its a husband and wife offer to all modellers to gain free plans and I personally like to give back so it helps them and us.
You don't have to tell them your secrets of tuning.
That is undersatandable and okay.
Just the basic airframe with as much as you want to add.
The experienced flyers will love it.
I would like to do it, but i have no plans. is a photo with dimensions enough or how does that work?
I'm not so enthusiastic about the flight characteristics, I'll probably build a new version.

Installed a small gps today and actually reached 129 km/h! I am amazed at how accurate these calculations are!
Tried another propeller (APC 4.1*4.1) and reached 158 km/h with no wind.
I think I'm on the right track, but I still have a lot of tinkering to do Very HappyCox PeeWee Micro Speeder - Page 2 A42deb10
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Post  Woody Fri Jun 17, 2022 6:24 pm

Tobaiies wrote:
Woody wrote:
Tobaiies wrote:
Woody wrote:Its a cracker.
Deffo a Dingbat!!!.
FWIW....on yer next fuse try rounding the nose to match the fuel tank diameter just to get that little bit  more less drag?
On the inside of the fuse at the nose, glue in four triangular bits so that you can then sand the corners away?
Only a suggestion.
You are more expert than me with a world record toboot?
I wish my reactions were fast enough otherwise I would build one.
I fly DEAD bats!!!!.
Thanks!
I thought of that at first, but completely forgot about it while building it. drunken Mad
If you so feel inclined Outer Zone plans would love this one.
Its a husband and wife offer to all modellers to gain free plans and I personally like to give back so it helps them and us.
You don't have to tell them your secrets of tuning.
That is undersatandable and okay.
Just the basic airframe with as much as you want to add.
The experienced flyers will love it.
I would like to do it, but i have no plans. is a photo with dimensions enough or how does that work?
I'm not so enthusiastic about the flight characteristics, I'll probably build a new version.

Installed a small gps today and actually reached 129 km/h! I am amazed at how accurate these calculations are!
Tried another propeller (APC 4.1*4.1) and reached 158 km/h with no wind.
I think I'm on the right track, but I still have a lot of tinkering to do Very HappyCox PeeWee Micro Speeder - Page 2 A42deb10

You are doing famously and very devoted to the cause.
Watch the film " The fastest Indian". It will inspire you as it is all to do with the Gods of speed!!!!
re the plan, you would have to draw one up either by hand or electronically.
I draw mine by hand, get them scanned to form a pdf and send that to OZ.
I redesigned the fuselage for the Keil Kraft Dolphin to streamline it for a longer glide and sent my plan to Outer Zone. It is called YOGA DOLPHIN.
You could have a peep at that to give you some idea.
I went a bit OTT as I found I enjoyed creating a working plan.
It was all done by hand with Pencil. You do not need a drawing board. Just a roll of white paper and you are set.
The more detail you include the better.
Having said that, you have templates that can be pdf"d and you could write on the templates what the wood is and the thicknesses.
They love pictures, videos and things like what speed you have attained and importantly which engine.
Stories of flights blah blah blah etc.
Wish you luck.
Woody.
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Post  MauricioB Fri Jun 17, 2022 9:28 pm

congratulations, your model airplane is very fast!
You can place a throttle control and thus enjoy different flight maneuvers:
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Post  1/2A Nut Sat Jun 18, 2022 2:52 am

Good info, thank you for sharing Thumbs Up

What Receiver and GPS telemetry module are you using?
How much does the plane weight with GPS onboard?

Is it this RX and GPS?
RX is only 4.8g / 11g for the GPS worth the extra weight.
Cox PeeWee Micro Speeder - Page 2 S-l16044

Note the rpm needed to do 158 km/h 25.3k rpm
Cox PeeWee Micro Speeder - Page 2 Screen12

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Post  Tobaiies Sat Jun 18, 2022 3:40 am

1/2A Nut wrote:Good info, thank you for sharing  Thumbs Up

What Receiver and GPS telemetry module are you using?
How much does the plane weight with GPS onboard?

Is it this RX and GPS?
RX is only 4.8g / 11g for the GPS worth the extra weight.
Cox PeeWee Micro Speeder - Page 2 S-l16044

Note the rpm needed to do 158 km/h 25.3k rpm  
Cox PeeWee Micro Speeder - Page 2 Screen12

Small Cox Logo  Thumbs Up
Yes i use this rx Smile
As GPS i use a SM GPS Logger 2, its quite heavy and big Wink
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Post  1/2A Nut Wed Jun 22, 2022 2:21 am

Can you post a photo of the APC 4.1x4.1N?

https://coxengines.ca/cox-020/cox--020-piston-reset-tool.html

Cox .020 Piston Reset Tool / will be needing one of these.
Project engines should be checked set and ran up a bit rich.
After the first reset they tend to hold up very well with low drag
speed planes. Follow up with the next check after 1.5 hours of run time.

Time to check based on fuel mix, engine load from the prop and weight / drag of the plane.

Cox PeeWee Micro Speeder - Page 2 020_re10


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Post  Tobaiies Thu Jun 23, 2022 1:50 pm

1/2A Nut wrote:Can you post a photo of the APC 4.1x4.1N?

https://coxengines.ca/cox-020/cox--020-piston-reset-tool.html

Cox .020 Piston Reset Tool / will be needing one of these.
Project engines should be checked set and ran up a bit rich.
After the first reset they tend to hold up very well with low drag
speed planes. Follow up with the next check after 1.5 hours of run time.

Time to check based on fuel mix, engine load from the prop and weight / drag of the plane.

Cox PeeWee Micro Speeder - Page 2 020_re10


Small Cox Logo Thumbs Up
Broke the propeller on the landing... sanded it a bit more after the first few flights, but i think it was too much. I want to buy a few different propellers and test them SmileCox PeeWee Micro Speeder - Page 2 6e681210
Cox PeeWee Micro Speeder - Page 2 0cd4fa10


I will order the tool next time!
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Cox PeeWee Micro Speeder - Page 2 Empty Version 3

Post  Tobaiies Thu Jun 23, 2022 1:57 pm

I started with version 3. Still have a lot of grinding to do, but the basic construct is in place. Will secure the wing with rubber bands this time WinkCox PeeWee Micro Speeder - Page 2 Fd7d6810
Cox PeeWee Micro Speeder - Page 2 Df366110
Cox PeeWee Micro Speeder - Page 2 85f92510
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Post  1/2A Nut Fri Jun 24, 2022 3:04 am

Looks good heading in the right direction! Thumbs Up
The prop appears to read 4.1 x 4.7

Taking away the belly portion of the fuselage does speed up the plane.
Yes foil the tail surfaces to add speed and stability. The vertical stab has
the wood grain going the wrong way, prone to snap down the grain in a tumble.
Cox PeeWee Micro Speeder - Page 2 5be81010


Best TD .020 engine I have uses a Nelson insert plug static 3.6 x 4.5N / 30,604 rpm / 130 PS
Cut APC 3.8 x 4.75ECN for flight testing. The reworked engine is unique and rare these days.

Cut APC 4.75x4.75EC
Cox PeeWee Micro Speeder - Page 2 Lp047412


Cox glow plug radar checked 114 mph / 184 km/h 3.4x4.5 bull nose carbon cut prop achieved in 2018.
Since then  improved N props, precision centered apc prop plates and turbo plug heads bench tested.
141 mph / 227 km/h ground speed is possible with these improvements.  

Full wave tuned pipe would punch up more speed!!

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Post  getback Fri Jun 24, 2022 6:33 am

God job helping this young lad get some speed on Brad ! Very Happy your designs are looking good Tobaiies! This Site Rocks! Popcorn
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