Dave’s R/C Elec­tron­ics Servo Speed Re­ducer

Model Airplane News - - PRODUCT WATCH -

There are often model air­plane func­tions that re­quire the speed of the servo to be changed from the nor­mal ro­ta­tional re­sponse to some­thing slower. Scale flaps are what come to mind here. With com­puter ra­dios, some have pro­gram­ming that al­lows you to ad­just the speed of your servos, but for mod­el­ers us­ing ba­sic ra­dios, a sim­ply plug-in de­vice can pro­vide an in­ex­pen­sive so­lu­tion. To fly your model smoothly and con­sis­tently, the mo­tion of your flaps need to be slowed down, and that’s where a Servo Speed Re­ducer (SSR) comes in handy. If you sim­ply add the flap func­tion to a two- or three-po­si­tion switch, the flaps move quickly and this pro­duces a sud­den change in pitch, which has to be cor­rected dur­ing your land­ing ap­proach.

Avail­able from Dave’s R/C Elec­tron­ics, this SSR is com­pact and light­weight, and sim­ply plugs into place be­tween your flap servo and your re­ceiver. In­stal­la­tion takes only sec­onds. It also pro­vides ad­just­ment for the servo’s speed with a po­ten­tiome­ter (pot) on the cir­cuit board.

Set­ting up your model is easy. Af­ter you in­stall the SSR, make sure the re­ceiver is off. If the unit de­tects power but not a sig­nal, the in­di­ca­tor LED will slowly flash on and off. With the re­ceiver off, turn the pot full clock­wise and then turn on the trans­mit­ter, fol­lowed by the re­ceiver. The LED will come on (with­out flash­ing), in­di­cat­ing that the servo will op­er­ate at nor­mal speed with­out any speed re­duc­tion. To make an ad­just­ment to the speed, you turn the re­ceiver off, make the ad­just­ment to the pot, then turn the re­ceiver back on. This way, the de­vice’s cir­cuit mem­ory will ac­cept and re­tain the new set­ting, and the LED flashes rapidly.

Some fine-tun­ing is re­quired with some test flights to dial in the proper amount of servo speed re­duc­tion. By tak­ing sev­eral sec­onds to lower the flaps, the abrupt change in lift is min­i­mized and gives the plane time to set­tle down, smooth­ing out the flight path. Priced at $15.00, this sim­ple plug-in de­vice works great and pro­vides mod­el­ers with pre­cise con­trol over their servo’s speed and per­for­mance with­out need­ing a more ex­pen­sive pro­gram­mable trans­mit­ter.—Gerry Yar­rish dav­es­rce.com

With no sol­der­ing re­quired, the Servo Speed Re­ducer comes fully wired and is sim­ply plugged in be­tween your servo and re­ceiver.

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