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Old Sep 20, 2009, 01:23 PM
RC Airliner Man
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United Kingdom, Dudley
Joined May 2007
444 Posts
sheeting complete on the 747

Quote:
Originally Posted by teha99
Any updates?
hi, no updates on the 737, but i have completed the fuselage sheeting and all the lights are up and working, ive done a video and all though the video is naff, in person you would be impressed, id hope

will up load pics in a min, and when ive sorted the video that will be up next........
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Old Sep 20, 2009, 01:39 PM
RC Airliner Man
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United Kingdom, Dudley
Joined May 2007
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pics of 747

here you go....
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Old Sep 20, 2009, 05:42 PM
Real name's Teja :)
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USA, NJ, East Brunswick
Joined May 2008
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Sweeeet! It looks perfect! What power system would you recommend if I only use one edf system? How do you know?

Thanks,
teja
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Old Sep 20, 2009, 06:10 PM
RC Airliner Man
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United Kingdom, Dudley
Joined May 2007
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perfect.... i wish

Quote:
Originally Posted by teha99
Sweeeet! It looks perfect! What power system would you recommend if I only use one edf system? How do you know?

Thanks,
teja
hi teja thanks for that, but its far from perfect, needs a bit of filler, but it looks ok. ive been looking for what power to use for my 747, im on a budget at the moment, were expecting a baby at the end of october, so i can not spend to much. i may do as koziflyer did and put it as a pusher then upgrade to edf's. but i really want edfs!!!!!

teja do you mean for the 737??? im not sure....
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Old Sep 20, 2009, 06:58 PM
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Teja, the usual rule is go for about 200W per pound of plane, see here: http://www.rcgroups.com/forums/showthread.php?t=1085330

So you need to design the airframe for a particular size fan, work out what it weighs (or build and weigh it), then find a power system that gives the right amount of power. Obviously a 737 is a twin, so you want half the power in each fan.
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Old Sep 20, 2009, 08:05 PM
Real name's Teja :)
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USA, NJ, East Brunswick
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Ok thanks. How can I find out the watts with a particular edf system with motor on a website? is there a converter from watts to thrust?

Thanks,
Teja
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Old Sep 21, 2009, 07:03 AM
Globemaster Maiden Time
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Melbourne
Joined Jun 2007
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Quote:
Originally Posted by teha99
Ok thanks. How can I find out the watts with a particular edf system with motor on a website? is there a converter from watts to thrust?

Thanks,
Teja

You can ask Mark from ExtremeRC here in Australia. He is a Ducted Fan specialist and all his gear comes balanced and sounding great. www.extremerc.com.au.

Else you can try GWS for their thrust charts. http://www.gwsus.com/english/product...stem/edf64.htm

Or hobbycity, but these will not come perfectly balanced and may not give enough thrust. http://www.hobbycity.com/hobbycity/s...d__252W(4300kv)
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Old Sep 21, 2009, 04:53 PM
Real name's Teja :)
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USA, NJ, East Brunswick
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maybe a single prop would be best economically?

how about this?

http://www.graysonhobby.com/catalog/...roducts_id=414
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Old Sep 22, 2009, 11:09 AM
RC Airliner Man
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United Kingdom, Dudley
Joined May 2007
444 Posts
737-500 update

hi guys, had to restore my pc and install windows again. so havent worked on the plan for a few days but ive done today in cad all the formers with 3mm skin, and wing ribs just the engines to sort now before i get my plan printed. the body is over 20cm wide its going to be very easy to cover this with 3mm depron as there wont be too many tight bends apart from ther tail. ive attached a pic. i can share the dxf if you want it???

hers the pdfs, there the plans abit rough, i need to label all the wood etc, but it should get you started. the formers are 6mm deporn and sheeted in 3mm depon the spars in the wing are 6mm balsa stringers. any more questions please ask..........
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Old Sep 22, 2009, 01:47 PM
Real name's Teja :)
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USA, NJ, East Brunswick
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Oh sweet! I can maybe start building this long weekend because of Yam kapoor and all.

One question, how do you sheet the fuselage with 3mm depron? It barely flexes. Do you guys use heat guns and curve it? I tried to sheet with 3mm and it didn't work and looked horrible so I gave up.

Thanks,
Teja
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Old Sep 22, 2009, 03:55 PM
RC Airliner Man
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United Kingdom, Dudley
Joined May 2007
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bending depron

[QUOTE=teha99]Oh sweet! I can maybe start building this long weekend because of Yam kapoor and all.

One question, how do you sheet the fuselage with 3mm depron? It barely flexes. Do you guys use heat guns and curve it? I tried to sheet with 3mm and it didn't work and looked horrible so I gave up.

Thanks,

hi teja, depron is bendable!!! no need for heat guns. this has been said before, depron is like balsa it has a grain, it will bend one way well but not the other.

i use a large rollin pin just bend the depron around it. dont try and bend it to much in one direction if it break/crease. if it does crease, try the depron at right angles (so the grain runs a differnet way) it should bend round it. depron is good at bending you just have to know how

the last bit of sheeting on my 747 in the pic circled is 2 pieces joined down the middel but raps all the way round the fuselag and it a very neat job. if i must say myself, all i did was rap it around a large rollin pic, then a smaller tube i had in my shed, just be gentle when you rap it round. i hope the above makes sence
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Old Sep 22, 2009, 05:16 PM
Real name's Teja :)
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USA, NJ, East Brunswick
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I kind of get it, you mean like bend it over a smooth round surface with the same angle?
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Old Sep 24, 2009, 01:20 PM
RC Airliner Man
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United Kingdom, Dudley
Joined May 2007
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update 747

hi guys built the battery hatch today and installed to catches, also completed the wing sheeting. hinged the elevator and rudder aslo i have done the servo linkage for the rudder. and weighed the model. the weight so far is nearly 2 1/2 lb or 1.2 kg, so two 68 mm fans producing 600g - 800g would power this nicely i think.

the hatch has two pegs that locate into the holes shown in pic 2.
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Old Sep 24, 2009, 04:51 PM
RC Airliner Man
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United Kingdom, Dudley
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http://www.youtube.com/watch?v=of1b0A0BPCY

this was filmed on my mobile, so sorry for the bad quality.
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Old Sep 25, 2009, 02:58 AM
Globemaster Maiden Time
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Melbourne
Joined Jun 2007
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Quote:
Originally Posted by brett1984
hi guys built the battery hatch today and installed to catches, also completed the wing sheeting. hinged the elevator and rudder aslo i have done the servo linkage for the rudder. and weighed the model. the weight so far is nearly 2 1/2 lb or 1.2 kg, so two 68 mm fans producing 600g - 800g would power this nicely i think.

the hatch has two pegs that locate into the holes shown in pic 2.
Nice work. Is the all up weight (1.2kg) with motors or without. You will find that once you include the motors, servos and battery and paint it will quickly add up to 2.5kg. You have done a much cleaner and lighter job then me on this one - looks great!!!

I am looking forward to flying my one again-once the bloody weather comes good here in Melbourne. Would you believe it has been windy here non-stop for the last 2 1/2 months!!!!
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