Glossary - your forum needs you!

[David Ashby - Moderator]

Thanks everyone and especially Kiwikid, I've added those.

Edited By David Ashby - RCME on 12/09/2017 07:55:14

[Old Geezer]

My tuppenceworth if you reckon they merit inclusion: DUTCH ROLL. DERRY TURN & FARNBOROUGH PASS.

[Dave Cooper 3]

Castor Oil - the word superceded should be spelt "superseded" (from the word supersession)...I got 'picked-up' on this whilst at Airbus, by the Quality Assurance Team, writing the requirements spec' for the A350's wing !

Compliments of the season everyone...

Dave

[cymaz]

Afterrun oil.

[Former Member]

[This posting has been removed]

[Martin Harris - Moderator]

"Club Expert" - (often well meaning) person, usually with a long association with model flying who has picked up many nuggets of wisdom and shares them with the less experienced. Often, these can be outdated or "urban myth" information.

I suspect that many of us have been guilty of passing on such information over the years - hopefully we learn to think about the reasoning behind accepted facts as we gain more experience.

[John Rabone]

As a beginner the following definitions are missing and would help (obvious to experienced modellers);

Fairing blocks

Gusset

Doubler

Former

Stringer

Thanks, John

[Phil Green]

Posted in Glossary:

Mode 1 - refers to the set-up of the transmitter whereby the left stick operates the elevator and rudder, and the right stick operates the throttle and ailerons.

Mode 2 - refers to the set-up of the transmitter whereby the left stick operates the throttle and rudder, and the right stick operates the elevator and ailerons. Mode 3 and 4 also exist but are very rare in the UK.

Mode 3 - refers to the set-up of the transmitter whereby the left stick operates the elevator and ailerons, and the right stick operates the throttle and rudder.

Mode 4 - refers to the set-up of the transmitter whereby the left stick operates the throttle and ailerons, and the right stick operates the elevator and rudder.

Mode Zero - single-channel operation using no sticks at all - just a button.

[Phil Green]

In the interests of accuracy could I suggest a few corrections please David, all radio related...

Binding - a process that ensures the 2.4GHz receiver is recognised by the transmitter so the two can operate together. The actual process varies from brand to brand.
In a simple non-telemetry set this is wrong. The words 'transmitter' and 'receiver' need to be swapped. For telemetry sets, its half true as the link is bidirectional.

Brown Out - a momentary loss of operation of a receiver due to a drop in supply voltage below a minimum threshold. Normally a momentary effect only, and affects 2.4Ghz equipment rather than the older 35MHz radio.
Actually 'brown out' is a general term describing the unpredictable behaviour of any electronic system below its absolute minimum operational supply voltage (Spektrum users seem to think its 'their' word). It is not a behaviour unique to 2.4ghz receivers.

Crystal - the small component that determines which channel number you fly on. Both tx and rx need to have an identically matching crystal for the radio set to function. 2.4GHz spread spectrum sets don't require crystals.
No, the crystals are not identical and must differ in frequency by the appropriate IF.  They can also differ in multiplication factors, particularly for dual-conversion receiver crystals.   And all 2.4ghz equipment uses a crystal.

FASST - Futaba's 2.4GHz system brand name. Stands for Futaba Advanced Spread Spectrum Technology and uses warp-speed frequency hopping to ensure no breakdown of signal.
Actually FASST frequency hopping is very slow (8 milliseconds) relative to frequency spreading.

Frequency hopping - A system whereby some 2.4GHz radios hop from 2.4GHz band to band many times per second.
No they dont hop from band to band, they hop from channel to channel within the band

PPM - Pulse Width Modulation
No, PPM is Pulse Position Modulation !

Sorry to those who might feel this is pedantic, but surely a glossary is better if its right?

Cheers
Phil

 

 

Edited By Phil Green on 11/02/2020 16:47:45

[john davidson 1]

my contribution---- Split S

[Cathal Gantly]

Didn't see DLG in the glossary, but read it a lot on the site, so I looked it up:

Discus Launch Glider (DLG) is a model glider launched using a 'discus launch' in which the glider is held by a wingtip and the flier rotates rapidly before release.

Also, thought this might be useful...

Immelmann turn, named after German World War One fighter ace Max Immelmann, refers to two different flying manoeuvres. In World War I an Immelmann turn was a manoeuvre used after an attack on another aircraft to reposition the attacking aircraft for another attack. In modern aerobatics, an Immelmann turn (also known as a roll-off-the-top, or simply an Immelmann) is a manoeuvre resulting in level flight in the opposite direction at a higher altitude.