Topics in Category: Modelling Terms (Glossary)

emo
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admin's Avatar
Topic started 02 Nov 2011 02:21 by admin
We're testing a new idea. I'd like us all to build an entire category of words and meanings..... at our leisure. Please start a new topic for a new term and make the subject name also the term or abbreviation. You can see my 1st post on ESC's as an example. Also feel free to expand on others...
Polyphilla's Avatar
Last Post by Polyphilla 02 Nov 2011 11:28
I think Mike's hit on a good idea here. I know other forums may have a "Glossary" of terms used in aeromodelling, I believe www.modelflying.co.uk/ have made one, but I suspect ours may be different. Instead of us thinking of a modelling term & giving it a short definition, we'll give it a...
emo
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Eric's Avatar
Topic started 07 Nov 2011 19:49 by Eric
This is VERY different to aoa, although at first glance it is the same thing. Angle of Incidence is the angle of the aerofoil centreline compared against the longitudinal centreline of the aircraft fuselage. So - in normal flight, the fuselage is level, but the Incidence is slightly positive, to...
The Beard's Avatar
Last Post by The Beard 27 Oct 2012 06:42
Well Im learning slowly,and Ive also learnt that sometomes we have to reduce the angle of attack as it can be to steep,and this wil cause the model to tip stall because its as if its going up hill to steeply loses speed and stalls,which causes a tip, which causes a crash and makes us unhappy :dry:...
emo
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Klipkopwildlife's Avatar
Topic started 10 Oct 2012 14:12 by Klipkopwildlife
A FET, more correctly a MosFet is a 3 terminal device that supplies current to the end user, typically, but not exclusively the motor that turns the propeller. The terminals are gate, source and drain, the gate switches it on (and off), the source is the battery and the drain goes to the motor....
The Beard's Avatar
Last Post by The Beard 10 Oct 2012 21:07
Oh that bit is clear as mud now I normally thow it away :whistle: :whistle: Now I know why my leccies dont run ,thought it was the little tiny starter motor.
emo
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Klipkopwildlife's Avatar
Topic started 02 Nov 2011 11:39 by Klipkopwildlife
If an aircraft is going to fly successfully the CoG must be in the right place. Too far back and the plane will never fly again!:( Too far forward and it may. On a parallel wing (width the same all the way along) the CoG shouls be 25 to 33% of the width back from the front edge. 30% is good for...
Dave Underhill's Avatar
Last Post by Dave Underhill 09 Oct 2012 20:17
Good man - thanks
emo
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Eric's Avatar
Topic started 26 Mar 2012 05:10 by Eric
Where to point the aerial on your transmitter. It doesn't matter what frequency, this applies to all. With your transmitter held at the angle you use it while flying your model, the aerial should point vertically upwards. (Downwards will do if you have one of those plug-in modules, and cannot point...
Garry Pollard's Avatar
Last Post by Garry Pollard 08 Apr 2012 21:18
Yes, I have found this can be a problem with cheap radio s.:) :) :) With my very expensive DX 7 the same prob doesnt exist Sorry, couldnt resist it :) :) Garry
emo
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Eric's Avatar
Topic started 09 Jan 2012 20:31 by Eric
something to do with gyroscopic precession. No, klippy, that is something entirely different! Gyro precession is a reaction to an action. Your gyroscope, whether it be a prop, a flywheel or whatever, will travel quite happily along the line of it's rotation BUT when you try to twist it while it...
Quorneng's Avatar
Last Post by Quorneng 11 Jan 2012 17:29
Yes, but fortunately on most electric planes the prop is only a tiny percentage of the all up weight and even outrunners have a small diameter so gyroscopic forces are small but it is interesting to note just how heavy a rotary was when compared to the airframe. The Oberursel (close copy of Le...
emo
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Klipkopwildlife's Avatar
Topic started 13 Nov 2011 14:22 by Klipkopwildlife
Setting end points saves servos! It's as easy as that, after setting your Subtrim, set all your end points so the control surface doesn't whack it's stop, your flight battery will last longer too!:)
Klipkopwildlife's Avatar
Last Post by Klipkopwildlife 15 Nov 2011 20:25
Just remember that these 'computer' radios are not proportional, meaning not analog, they have steps from full one way to full the other. Don't quote me on this but I think it's 1,024, suppose you've set your servos and clevises really badly, and in order to get the right throws you have to move the...
emo
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Klipkopwildlife's Avatar
Topic started 13 Nov 2011 14:27 by Klipkopwildlife
Sub trim allows you to set the mid point of a control surface without eating up your front panel trims. While we should try to set our controls mechanically correct, sometimes it's not possible, and that's where this function comes in. Particularly useful on grass cutters (sorry, helichopters)
emo
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Klipkopwildlife's Avatar
Topic started 13 Nov 2011 14:13 by Klipkopwildlife
This has got to be one of the most useful functions on your Transmitter! Expo deadens the response of your control functions close to the centre of the stick. Lets put it another way, suppose your elevator stick has 25degrees of back(up) movement, and obviously the same forward(down). Lets suppose...
emo
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Eric's Avatar
Topic started 07 Nov 2011 19:34 by Eric
also referred to as aoa, a of a, or alpha. This is the angle at which the wing is presented to the airflow, in order to create lift. 0 alpha = 0 lift too much alpha also = 0 lift! The forward speed is also important - more speed = less alpha to achieve the same amount of lift.
The Beard's Avatar
Last Post by The Beard 08 Nov 2011 16:43
Then Tony ,Eric has taught me something,he has a beard you know its 30 years long apparently
emo
C
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Klipkopwildlife's Avatar
Topic started 03 Nov 2011 11:11 by Klipkopwildlife
C is the current delivering capacity of a battery. 20C means that we can draw 20 times the capacity of the battery as current. So if we had a 2200mAh 20C battery then, 2200mAh is 2.2Ah x 20 = 44Amps
emo
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Klipkopwildlife's Avatar
Topic started 02 Nov 2011 11:49 by Klipkopwildlife
UAV's, eye in the sky, spy planes, call them what you will, dependant on the size, everything you read is true. Hard to knock down, the smaller ones can be hand launched and typically only contain a camera and a return to launch feature. The larger ones can be armed, and frequently are, recovery of...
emo
ESC
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admin's Avatar
Topic started 02 Nov 2011 02:23 by admin
An electronic speed control or ESC is an electronic circuit with the purpose to vary an electric motor's speed, its direction and possibly also to act as a dynamic brake. (feel free to expand).
Klipkopwildlife's Avatar
Last Post by Klipkopwildlife 02 Nov 2011 11:31
It also issues signals, armed and therefore dangerous, and can even be programmed to ramp up and down as opposed to instantaneous.
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