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Old Feb 28, 2011, 03:35 PM
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Build Log
Triple cox .049 36 inc control line Spitfire

Built a new wing for this kit, a model built with my daughters.
The idea is to try it with 2 engines, before the 3!
As alway a few minor bits preventing flight. Not the least daughters reluctance to hold it with 2 or 3 un muffled Cox engines screaming. Impressively loud!
And been very windy here too.

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Old Mar 07, 2011, 04:42 PM
kill your idols
ZEROSKIN76's Avatar
utica new york
Joined May 2009
1,819 Posts
your mad mad i tell you... great plane so does that make it 1 and 1/2a now?
or does it just count three times?

please post flight video here if you get some so i can see it


ps yes the cox do tend to curdle my sons milk also as far as loudness
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Old Mar 07, 2011, 05:07 PM
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Hi Zeroskin!
Most likely not 1 & 1/2 A but a hole surrounded by tatters of balsa & fuel!

I do not know if it will survive to be filmed for long. Of course I will try it with 2 engines before 3. But @ 150 kmh, (90 MPH) on 60 foot leads ( which I need to get) , my 22 oz beastie will pull on the wires with a force of .... hmmm ..... make it about 14 pounds.
So my guess that I will be left holding lines attached to a bellcrank, 15 cm of piano wire, & maybe an elevator horn and tatters of balsa fuselage and elevator .
At 100 kmh it is a more possibly survivable but still hefty 7lb.
I think it needs fuselage opened up & bellcrank area strengthend before flight.
I think I will indeed recalibrate the 2 wing engines "straight ahead" relying on the offset of the central one alone, and rudder offset.
I do not however want, as has been suggested, it chasing me!

At 100 kmh (assuming my "single engine" does 70 km) the loading should be OK . Loading only goes up 1.6 times. By increasing radius from 8 m to 18m, BUT at 150 kmh the load is 3.6 times greater than design. T
Any idea on likely speed? I guess about 100 to 120 kmh.
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Old Mar 07, 2011, 05:11 PM
kill your idols
ZEROSKIN76's Avatar
utica new york
Joined May 2009
1,819 Posts
110 to 125 sound on the money

still it has to be done if not you by me and if you survive... drinks and chuckie cheese for the kids on me

i have a 5 oz mini flying on 30 foot lines and it hits 87 and feels like im holding a bowling ball, i cant imagine

the brace for the bell crank should be thick ply or carbon at this point



Quote:
Originally Posted by strasbourge View Post
Hi Zeroskin!
Most likely not 1 & 1/2 A but a hole surrounded by tatters of balsa & fuel!

I do not know if it will survive to be filmed for long. Of course I will try it with 2 engines before 3. But @ 150 kmh, (90 MPH) on 60 foot leads ( which I need to get) , my 22 oz beastie will pull on the wires with a force of .... hmmm ..... make it about 14 pounds.
So my guess that I will be left holding lines attached to a bellcrank, 15 cm of piano wire, & maybe an elevator horn and tatters of balsa fuselage and elevator .
At 100 kmh it is a more possibly survivable but still hefty 7lb.
I think it needs fuselage opened up & bellcrank area strengthend before flight.
I think I will indeed recalibrate the 2 wing engines "straight ahead" relying on the offset of the central one alone, and rudder offset.
I do not however want, as has been suggested, it chasing me!

At 100 kmh (assuming my "single engine" does 70 km) the loading should be OK . Loading only goes up 1.6 times. By increasing radius from 8 m to 18m, BUT at 150 kmh the load is 3.6 times greater than design. T
Any idea on likely speed? I guess about 100 to 120 kmh.
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Old Mar 07, 2011, 07:15 PM
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Yes. drinks & chuckie cheese if it flies. Dad BECOMES chuckie cheese if one engine runs out before the other & it comes to chase me. ( may therefore go to one tank, one long fuel line to outer engine. Then worry about fuel pressurisation)
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Old Mar 07, 2011, 07:21 PM
kill your idols
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utica new york
Joined May 2009
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use a bladder tank to pressurize the fuel flow

got to the 1/2 section and post a forum asking for direction the guys in the 1/2a section are good with these issues





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Originally Posted by strasbourge View Post
Yes. drinks & chuckie cheese if it flies. Dad BECOMES chuckie cheese if one engine runs out before the other & it comes to chase me. ( may therefore go to one tank, one long fuel line to outer engine. Then worry about fuel pressurisation)
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Old Mar 07, 2011, 09:22 PM
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thanks
never heard of a bladder tank. Don't you use them at a big ball game?
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Old Mar 07, 2011, 09:29 PM
kill your idols
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utica new york
Joined May 2009
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a bladder tank is a ballon or a pen bladder from a expensive fountain pen
its cheap to make and you fill with a non pointed hypodermic needle and it has pressure from the ballon or bladder and wil get all the fuel out

also you can consider building a pressure tap from middle engine to the tank

ive used the stick muffler from the car and tapped it to add a pressure nipple

il post a pic for you for some ideas


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thanks
never heard of a bladder tank. Don't you use them at a big ball game?
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Old Mar 07, 2011, 09:39 PM
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utica new york
Joined May 2009
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sorry my battery appears to not be taking a charge anymore

it is from the sandblaster

it costs 7 usd on ebay with 4 usd world wide shipping

just enlarge the small bleeder wholi in the side and insert a small brass or stainless steel peice of 1/8 tubing )or smaller if you can)

it needs to be soldered or epoxied into place
it should be placed directly over the exhaust port for best presure

you should have a body clip for a car to help control the pressure
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Old Mar 12, 2011, 01:17 PM
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Thanks for that Zero skin. If the carb does not flood when pressurised like this it may not from centrifugal force down fuel line. Will see when I try it.
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Old Mar 12, 2011, 01:34 PM
kill your idols
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utica new york
Joined May 2009
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it will require finess to find proper needle setting and always floods til you figure out the correct mixture fine needle valves help but i dont have many


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Thanks for that Zero skin. If the carb does not flood when pressurised like this it may not from centrifugal force down fuel line. Will see when I try it.
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