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Post  mitchg95 Fri Feb 03, 2012 4:58 pm

hello, i got a z-37 cmalak electric rc airplane from my little brother in a trade last night, i would love to convert this airplane to cox .049 power, i have a couple ideas on how todo this sortof thing buy i have never done a electric to nitro conversion before, i am considering my baby bee, or my golden bee to use in the airplane, any suggestions are greatly appreciated.

z-37 cmelak, rc electric to nitro conversion Sam_1410
nose view
z-37 cmelak, rc electric to nitro conversion Sam_1413
cowling view
z-37 cmelak, rc electric to nitro conversion Sam_1415
what should i use for power?
z-37 cmelak, rc electric to nitro conversion Sam_1417
z-37 cmelak, rc electric to nitro conversion Sam_1418
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Post  microflitedude Fri Feb 03, 2012 5:25 pm

Hi Mitch.

If you want to fly for more than about a minute, use the Golden Bee. Also if you want to any kind of aerobatics, use the Golden Bee as it has the stunt tank. You will need to cobble some kind of clunk to a flexible fuel line - the fuel will be sloshing around the line resulting in a jittery, hard to needle run if you use a stationary pickup.

Feel free to ask all the questions.... Smile
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Post  mitchg95 Fri Feb 03, 2012 5:27 pm

I am just looking to put around the sky and slowly glide back to earth with a dead engine
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Post  nitroairplane Fri Feb 03, 2012 6:08 pm

What is the weight of the model?
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Post  mitchg95 Fri Feb 03, 2012 6:09 pm

i have not a clue, it seems that the wing weighs less than 4oz, same with the fuselage
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Post  nitroairplane Fri Feb 03, 2012 6:19 pm

Ok just make sure it is bui strong enough to take a .049!
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Post  mitchg95 Fri Feb 03, 2012 6:20 pm

i will, the fuselage is fiber glass, i've never had an airplane like that before
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Post  nitroairplane Fri Feb 03, 2012 6:26 pm

Ok more rigid than balsa so you may want some foam insulation in the engine bay.
Fiber glass more dense so vibrations travel better.
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Post  mitchg95 Fri Feb 03, 2012 6:28 pm

cold i just use the expanding spray foam, and just fill the front end of the fuse?
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Post  nitroairplane Fri Feb 03, 2012 6:30 pm

mitchg95 wrote:cold i just use the expanding spray foam, and just fill the front end of the fuse?

I dont see why not.
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Post  mitchg95 Fri Feb 03, 2012 6:31 pm

cool, ill try to get some from my uncle who is a carpender
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Post  mitchg95 Fri Feb 03, 2012 10:48 pm

hey, good progress on my z-37 cmelak, i got my 1/4" firewall installed and also installed my early cox golden bee .049 Cool
ill post some pics tomorrow, i still have to inject the expanding foam into the body of the plane, other than that the conversion is almost done Very Happy
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Post  mitchg95 Fri Feb 03, 2012 10:56 pm

i also found out who makes it... its "fvk models" specs are

Construction is fiberglass fuselage, built-up film-covered wing, and film-covered sheet balsa tail. The motor (Speed 280 brushed) with 4:1 gearbox is factory installed; the wings and tail surfaces are covered and hinged; includes 3-blade prop, landing gear, wheels, control horns and rods, decals. 38" WS, 30" length, Flying Weight 380-400 grams (13 - 14 ounces).
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Post  microflitedude Fri Feb 03, 2012 10:58 pm

mitchg95 wrote:i also found out who makes it... its "fvk models" specs are

Construction is fiberglass fuselage, built-up film-covered wing, and film-covered sheet balsa tail. The motor (Speed 280 brushed) with 4:1 gearbox is factory installed; the wings and tail surfaces are covered and hinged; includes 3-blade prop, landing gear, wheels, control horns and rods, decals. 38" WS, 30" length, Flying Weight 380-400 grams (13 - 14 ounces).

A geared down 280?

Hold on tight!
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Post  mitchg95 Fri Feb 03, 2012 11:03 pm

i shurr will, i would rather over power it lol! than have to small of a motor
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Post  microflitedude Fri Feb 03, 2012 11:05 pm

mitchg95 wrote:i shurr will, i would rather over power it lol! than have to small of a motor

That was my plan too. Smile

If it is too much, try an .020 or even an .030 if you can find one.
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Post  mitchg95 Fri Feb 03, 2012 11:08 pm

that would work perfectly i have a peewee, but it is in a littlest stick im building
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Post  microflitedude Fri Feb 03, 2012 11:12 pm

mitchg95 wrote:that would work perfectly i have a peewee, but it is in a littlest stick im building

I will be selling a silver one within the next few weeks if you need it.
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Post  mitchg95 Sat Feb 04, 2012 3:00 am

peewee or littlest stick, im confsed
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Post  nitroairplane Sat Feb 04, 2012 5:03 am

I think he is selling te silver pee wee.
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Post  John Goddard Sat Feb 04, 2012 7:19 am

I'm not sure about the foam Mitch.
If you do, keep it to a minimum. Strangely, it does weigh quite a bit.
And based purely on my 010 exploits with a plane that weighs less
than 4 and a half ounces I think that your 38in span 14 oz 'monster' is going to struggle.

Conventional wisdom in lekky circles is
50watts per pound will fly'justabout.
100 watts per pound OK for sport (ish) flying
200+ watts per pound 3d

I think you're already struggling to be at 50wpp with the 049. Forget smaller engine

I tell you what I've done,-
I put carbon fibre push rods in.
I took the plakky case off my RX
I bought a 150mah Losi rx battery from your side for 8 bucks/15grams ten mins of flying this AM still got 110mah in it.

Good Luck
John

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Post  nitroairplane Sat Feb 04, 2012 7:24 am

Well a .049 will pull a 14oz 48" easy!
A pee wee probably not but a tee dee 020 it would fly but not well.
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Post  John Goddard Sat Feb 04, 2012 7:55 am

I'm just going by my (very limited admittedly) experience Indra.
What I always tell my pupils if they haven't already got a
Plane of their own is to buy an engine at the top of the power
Range rather than the bottom.
For me there's nothing worse than an underpowered aircraft
But for Learners why make it difficult by having to nurse
A plane round rather than fly it?
Very Happy
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Post  nitroairplane Sat Feb 04, 2012 7:58 am

John Goddard wrote:I'm just going by my (very limited admittedly) experience Indra.
What I always tell my pupils if they haven't already got a
Plane of their own is to buy an engine at the top of the power
Range rather than the bottom.
For me there's nothing worse than an underpowered aircraft
But for Learners why make it difficult by having to nurse
A plane round rather than fly it?
Very Happy

Yeah i get that under powered sucks but what i hate more is over pitched props that just don't climb well!
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Post  microflitedude Sat Feb 04, 2012 8:33 am

nitroairplane wrote:I think he is selling te silver pee wee.

Correct.
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