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Nov 09, 2004, 03:07 PM
Thread OP

build a fomie from scratch for a school project; Help Needed to

Hay guys, i know it has been a long while scince i posted here (school work has realy picked up now in the 6th form)

but any way i am doing my year in AS, and a un missabel opertunity turned up for my technolgy cw, i plan to build a flying wing from scratch.

So far i have got a few ready out of the box planes and a helicompter (i usually only post in the helicopter foroom)

but now i would like to build a flying wing and make the speed controler my self. (and the Tx and Rx if i have time)

what would be a great help is if you guys could explane roughly how to make a bec speed controler roughly (i understand the normal speed controler) but i was wondering how you make it a bec, and iff not what do you plug into the rx to power it.

any help on how to actually make the main wing would also be a help, in particular the shape of the croxx secton. i plan to make it out of epp foam (well some similar stuff the school has)

see pics

many thanks, i will keep you updated

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Nov 09, 2004, 03:11 PM
Thread OP

Parts so far:

so far i have ordered

2 x 380 motors

2 x 18g servos

i have also ordered some other minor stuff like wiers and covering tape, and a load of props, i was wondering what would be the best size to use on a 380 motor

also what weight should i aim to keep it under

many thanks

Nov 09, 2004, 03:57 PM
Registered User
alexcmag's Avatar
A BEC (Battery Eliminator Circuit) is simply a 5V voltage regulator with a 5V output.

The 3 pin regulator (LM2940C-5.0) do all the work only needs an electrolitic condensers before and another after the regulator. If the battery is 7-cell NiMh or more you can even use a 7805 (very easy to find on any electronic parts store).

I found a very easy to build and good working speed control project in

If you want to keep as simple as possible, use the no break version and eliminate r1, r2, c1, c5, r6 (connect pin 4 to 5V), w1, c3. It will have no cutoff, no break, but will more simple to build.

If you took off C2, R4 and R5 it will be a 5 piece ESC and still works well, but the motor will spin a little when turn on.
Last edited by alexcmag; Nov 09, 2004 at 04:13 PM.
Nov 09, 2004, 04:04 PM
Thread OP
thansk so much, this should be perfect


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