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

Logged in members see NO ADVERTISEMENTS!


Holy Cow!!! Cox_ba12




Holy Cow!!! Pixel

Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» My N-1R build log
by roddie Today at 12:32 am

» Happy 77th birthday Andrew!
by akjgardner Today at 12:27 am

» TEE DEE Having issues
by TD ABUSER Yesterday at 9:43 pm

» Landing-gear tips
by roddie Yesterday at 6:17 pm

» Roger Harris revisited
by TD ABUSER Yesterday at 2:13 pm

» Tee Dee .020 combat model
by Ken Cook Yesterday at 1:41 pm

» Retail price mark-up.. how much is enough?
by Ken Cook Yesterday at 1:37 pm

» My latest doodle...
by roddie Yesterday at 10:43 am

» Chocolate chip cookie dough.........
by roddie Fri Nov 22, 2024 1:13 pm

» Purchased the last of any bult engines from Ken Enya
by sosam117 Fri Nov 22, 2024 11:32 am

» Free Flight Radio Assist
by rdw777 Fri Nov 22, 2024 9:24 am

» Funny what you find when you go looking
by rsv1cox Wed Nov 20, 2024 3:21 pm

Cox Engine of The Month
November-2024
Kim's

"A Space Bug Jr. pulls the Q-Tee up high over Sky Tiger Field"



PAST WINNERS
CEF Traveling Engine

Win This Engine!
Gallery


Holy Cow!!! Empty
Live on Patrol


Holy Cow!!!

Go down

Holy Cow!!! Empty Holy Cow!!!

Post  batjac Thu Sep 10, 2020 5:55 am

As I said in an earlier post, I was given a quart of nitro by a club member. I decided to figure out how to best use it to doctor up some of the other fuels I have.  My choices are a quart each of Traxxas 20% and 33% Top Fuel Power Plus, which has 16% oil and 50/50 castor/synthtetic per the Traxxas rep.  I have a gallon of Omega 4-cycle which is 15% nitro and 17% oil at 50/50.  And I have a gallon of Omega 15% heli fuel.  Now, Omega is sold as a Castor/synthetic mix, usually 30% Castor and 70% Synthetic.  The 4-cycle is an exception at 50/50 mix.  The other exception is the 15% heli.  The heli oil is a 1/99 mix.

????? ONE percent castor!!!  Holy Cow!  There's no saving that fuel for control line...

Ah, well.  With the quart of nitro and a quart of SIG castor I can bring the Omega 4-cycle to 25% nitro and 20% oil, the Traxxas 20% to 25% nitro and 20% oil, and the Traxxas 33% to 31.5% nitro and 20% oil, and still have 18 ounces of caster and 9 ounces of nitro left for future doctoring.  

I used this website to do the calculations because it's late and I don't have any scratch paper to hand:

Fuel Calculator page


But, since I'm going to be doing some Cox .09 flying in the next couple of weeks, maybe I'll just up the oil content of the 20% Traxxas and settle for essentially 20/20 fuel for the .09.  Hmmm.  I'll have to sleep on that one.


The Mixologist Mark
batjac
batjac
Diamond Member
Diamond Member

2022 Supporter

2023 Supporter

Posts : 2375
Join date : 2013-05-22
Age : 61
Location : Broken Arrow, OK, USA

Back to top Go down

Holy Cow!!! Empty Re: Holy Cow!!!

Post  davidll1984 Thu Sep 10, 2020 7:52 am

Y use same méthodes mixing 4 difrent fuel To get the right fuel and 4cycle fuel is hi in
Méthanol and lower oil lets say is Good To have som just To refrech old fuel y ad som aditive To the mix and adjustment To weather condition

davidll1984
davidll1984
Diamond Member
Diamond Member

Posts : 2327
Join date : 2020-02-12
Age : 39
Location : shawinigan

Back to top Go down

Holy Cow!!! Empty Re: Holy Cow!!!

Post  getback Thu Sep 10, 2020 8:37 am

I guess my question is why do you have all those different FUELS? Small Cox Logo Good you can save them for use with the Coxes though. Cool
getback
getback
Top Poster
Top Poster

2022 Supporter

2023 Supporter

Posts : 10442
Join date : 2013-01-18
Age : 67
Location : julian , NC

Back to top Go down

Holy Cow!!! Empty Re: Holy Cow!!!

Post  fredvon4 Thu Sep 10, 2020 9:34 am

Mark
I am NOT buying the 1:99 Heli mix....I have seen some Car racing blends a low as 11% lube most of the time all synth

When I am in our only local Hobby shop (RC Car oriented with a race track complex in the back yard) I usually can find RC car fuels with high nitro but low oil for what I consider cheap, at under $20 per gallon

I got two gallons a while back for $17 each...25% N and 14% lube and no idea the lube synth/castor amount so just assume it is all synth

I have 2 gallons of Torco Nitro and local sourced Methanol and a bunch of various synth and Castor oils

Using 25% cheap nitro gallon to make Higher (20%~25%) oil content for 2 stroke aircraft use is relatively inexpensive and the math in Metric Millilitres is real easy
fredvon4
fredvon4
Top Poster
Top Poster

2022 Supporter

Posts : 4012
Join date : 2011-08-26
Age : 69
Location : Lampasas Texas

Back to top Go down

Holy Cow!!! Empty Re: Holy Cow!!!

Post  batjac Thu Sep 10, 2020 7:42 pm

getback wrote:I guess my question is why do you have all those different FUELS? Small Cox Logo Good you can save them for use with the Coxes though. Cool

I bought the gallon of 4-stroke to run in my Saitos before I bit the bullet and bought YS-Saito 20/20 fuel by Powermaster. The heli fuel I bought for a heli that I never got around to flying. The Traxxas stuff I bought because it's the only thing the local shop carries.

The Obvious Mark
batjac
batjac
Diamond Member
Diamond Member

2022 Supporter

2023 Supporter

Posts : 2375
Join date : 2013-05-22
Age : 61
Location : Broken Arrow, OK, USA

Back to top Go down

Holy Cow!!! Empty Re: Holy Cow!!!

Post  944_Jim Thu Sep 10, 2020 7:58 pm

Hi Mark,

See here:
http://web2.murraystate.edu/andy.batts/ps/fuel.htm

The Excel spreadsheet is built for quarts. I edited my local copy for 8 ounce total blend. Play the numbers for two different pairs (fuels A/B and fuels C/D of fuels, then grind those two resultants to get your final blend.

For me, I use hi nitro/low synth oil heli fuel, lower-nitro mid-castor content truggie fuel, and a shot of castor. My final has about 22% nitro, and 20% 50/50 synth/castor. The engines make good power, don't overheat, and splatter the model with a light layer of castor/exhaust mess (easily cleaned up).

_________________
Never enough time to build them all...always enough time to smash them all!
944_Jim
944_Jim
Diamond Member
Diamond Member

2022 Supporter

2023 Supporter

2024 Supporter

Posts : 2022
Join date : 2017-02-08
Age : 59
Location : NE MS

Back to top Go down

Holy Cow!!! Empty Re: Holy Cow!!!

Post  andrew Thu Sep 10, 2020 11:24 pm

I'm glad that spreadsheet was of some use for you.  I wrote that over 15 years ago simply because I got tired of doing the calculations by hand.  At the time I was mixing Sidewinder 20/10 and Sidewinder 30/10 with BeNol to get the blend I wanted.  I also have an Excel calculator for one mix that is a little easier to use.  Later I wrote a Windows application that uses a slider to allow selecting the desired castor percentage after entering the original fuel mixture.  It allows the user to drag the slider with their mouse and spontaneously recalculates the values.  Unfortunately, all I have is the executable which my email provider will block.  The original code was on my office computer, but I guess I failed to migrate it when I retired.

I am attaching a screen shot of the Windows product -- it worked well.

Holy Cow!!! Castor13
andrew
andrew
Diamond Member
Diamond Member

Posts : 1816
Join date : 2011-08-11
Age : 77
Location : Western Kentucky

http://web2.murraystate.edu/andy.batts/ps/POWERSUPPLY.HTM

Back to top Go down

Holy Cow!!! Empty Re: Holy Cow!!!

Post  944_Jim Fri Sep 11, 2020 7:54 am

Andrew,
Any time someone wants to blend two fuels, I point them to your Excel spreadsheet. I've been doing that here, on RCG, and StuntHanger for at least four years. Or for almost as long as my comeback to the hobby.

I appreciate the Excel one specifically because it does the math for a two-fuel blend. I appreciate the ability to input two fuels with known nitro and oil content, and computing/outputting the combined values. In my case, I get high N/Low C fuel, and straight methanol to reduce the nitro/increase the castor for my needs.

You have advertised your newer GUI-version the last few times I mention your "old tool,"  but your screenshot looks like it is for doctoring-up the castor content of one fuel.

I hope the new one can do two fuels. I guess I need to try the new tool.

Thanks for sharing your tools.


Last edited by 944_Jim on Fri Sep 11, 2020 8:34 am; edited 1 time in total (Reason for editing : Clarity)

_________________
Never enough time to build them all...always enough time to smash them all!
944_Jim
944_Jim
Diamond Member
Diamond Member

2022 Supporter

2023 Supporter

2024 Supporter

Posts : 2022
Join date : 2017-02-08
Age : 59
Location : NE MS

Back to top Go down

Holy Cow!!! Empty Re: Holy Cow!!!

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

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