100% carbon fiber funjet

[b1bman]

heres some pics

[Moxus]

wow, thats a hawtie
how heavy is just the shell of it?
i got one with 1.2 kw motor setup, it could definetly benefit from trading the foam for some composite
13.5 oz, is that the complete shell, or only as it appears in the picture?

[b1bman]

Originally Posted by Moxus

wow, thats a hawtie
how heavy is just the shell of it?
i got one with 1.2 kw motor setup, it could definetly benefit from trading the foam for some composite
13.5 oz, is that the complete shell, or only as it appears in the picture?

as you see. the one missing rudder will be .5 Oz the rear canopy is .3 Oz and batt tray is .7 Oz. I think the empty weight will be around 19 Oz

[Moxus]

very nice. a bit on the heavy side, but i guess thats not an issue with the kind of setup you are going to use anyway

one beware though:
at 1.2 kw, the moment from the propeller is so awful that it can easily throw the model on its back before you get up to control speed. even with full aileron the opposite way.
mine was just on the limit with 6x4 propeller.
tried 6.5 x 6.5, and the jet got thrown on the back and into the ground before i got steering speed on it.

new funjet recieved and awaiting assembly. currently working on a contra rotating gearbox for it, build from a traxxas t-max differential unit :P

[b1bman]

thats something I would like to see the gear box

[b1bman]

the micro jet is know for that flipping over and I have had the funjet do it a few time

[Moxus]

its not much to see yet, as its not nearly finished. just a pile of parts.
anyway, its not that complicated once you got the differential.

you just drill out the axle in one end, to put in an inner axle, that you fix to the gear on hte opposing side.
the middle section thats ususally driving in a car, will be fixed here.
now, when you put power on the gear on the one side, the gear on the other side will spin the opposing direction, with the inner axle still spinning same direction as the motor.

[wingnutt]

b1bman - i have been considering scratch building a funjet myself. would you mind sharing the airfoil and amount of washout (if any) you used?

[b1bman]

Originally Posted by wingnutt

b1bman - i have been considering scratch building a funjet myself. would you mind sharing the airfoil and amount of washout (if any) you used?

it is a copy of the the funjet the only thing different is the thickness
mine is thiner so it will go faster I hope

[b1bman]

http://www.youtube.com/user/b1bman#p/u/12/IMTDsvkqrko

[Moxus]

how did you do the vacuum forming? and how does your vacuum forming rig look? what plastic did you use?
i'm particulary interested in the vacuum forming rig.
i googled for it, and its simple in small scale.
but when the plates need to be bigger than what i can put in my oven, and i need the forming rig to be "2 sided", there be dragons.
where do you put the vacuum pump for example, when both sides is obscured by the plastic sheets?

[b1bman]

heres a video of how I did the B1B
http://www.youtube.com/user/b1bman#p/u/34/z3LOEr77BqQ

no oven needed if you use low temp epoxy I used a heat gun. the heat gun is not needed but it dose help. I dont use plaster any more to make the molds
I now use fiberglass to make the molds. There is a guy on youtube that shows how to heres his link he has 90 videos
http://www.youtube.com/user/hornitpi...17/JvsWL5Rg1H0

I use West Systems Epoxy and strechlon bagging
http://www.westsystem.com/ss/
you can find every thing else here http://www.fibreglast.com/showproduc...plies-106.html

try to find a used vacuum pump at a pawn shop or something I got mine for a 100.00 bucks it is a Robinair vacuum pump you can also fined them cheap at harbor fright

I hope all this helps you let me know if you need more info

[b1bman]

almost done

[Moxus]

the looks of that thing is vicious
i wish you good luck with it, and i really want to start making one myself ^^ lots of holiday time to fill up soon (christmas)

[b1bman]

ya better look out its got the looks to kill

I will post a video of if on my youtube page

http://www.youtube.com/user/b1bman

if the maiden go's well I will go ahead and put a vicious power plant in it
Neu motor 1512/2d 6 cell 3900 CC ICE 100 AMP 5x4.5
thats 99. amps and 50,000 rpm on the prop and 213 prop speed

here the spec on it http://brantuas.com/ezcalc/neumotorscalc.asp

[Moxus]

hehe. about same as mine, powervise.
100a turnigy regulator, 6s batteries and align 600l motor (from trex helicopter).
im currently drawing only 60 amps, because of too small propeller. but even now, the thing is ludicrious fast ^^

if you go all the way to 100 amps, on a 6s battery..... :O

[b1bman]

test flight went well on 3 cell 2200 30c with a 3000 kv typhoon and a 6x5.5 prop
time for the real set up now that she is looking good

[CHELLIE]

Well, that looks very nice b1bMan, Looking forwards to a 200mph speed run Take care, Chellie

[Moxus]

i saw a funjet on youtube, it was 6s, 100a regulator, and 1700kv motor.
unfortunately, he didnt specify his setup in any more detail. particulary the batteries would been interesting to know more about.
anyway, he claimed 290 km/h on his funjet.
thats 179 mph. the way up to 200 mph is long.
this was a foamie funjet, but since the carbon one is a near identical copy i assume, then it should preform near identical too, speedwise.
i havent clocked mine yet (oh darn, that has taken some time. dont have a camera, so its a bit of clockwork that got to work out to do it. need a camera operator too) but i seriously doubt that its anywhere close to 200 mph.
thats f5d domain. look at the superthin wings those cuties got.

[b1bman]

thanks chillie I hope for 200 I am at 5000 feet so i may get close and my wing is just a little thiner than a stock fun jet but not much. It going to be a few months before I can get the motor but I do have every thing else

[CHELLIE]

Originally Posted by b1bman

thanks chillie I hope for 200 I am at 5000 feet so i may get close and my wing is just a little thiner than a stock fun jet but not much. It going to be a few months before I can get the motor but I do have every thing else

Have fun and be carefull Chellie

[b1bman]

heres a sort video of it flying
http://www.youtube.com/user/b1bman#p/u/13/NeC9tNoVP80

and a slide show of the making
http://www.youtube.com/user/b1bman#p/u/12/pfFXjTnSOPk

[b1bman]

http://www.youtube.com/user/b1bman#p/u/12/2_hJ3nGmKCE

[Moxus]

holy **** whats the roll rate of that thing?
yep, you REALLY need more expo ^^
or, less elevon travel
anyway, thats a really nice plane, and thanks for keeping us updated with this build thread. i really like this =)
congratulations on a plane well done, and must it give you many happy flying hours.

[Modifier]

Neat stuff!,,nice work on the CF project. blistering roll rate on that thing.

Be careful,,carbon fiber is lethal, not to mention the fact of man hours.

Keep the molds!,, You could have those 3D scanned, and milled out of whatever your hearts desire.