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New High Voltage High Power MG5921HV servo from Macgregor can pull over 20Kg.cm with a transit time of just 123mS

Logo for MacGregor Industries Ltd While it's worth getting one of these servos just so you can pull tree roots out of granite, it could also be used on large scale or aerobatic aircraft

MacGregor MG5921HV High voltage High power servo

Many of us 'users' these days are moving to Li-Fe receiver battery packs, but the higher voltage than a standard 4 or 5 cell NiMh pack can cause problems with some servos releasing what's commonly known as 'magic smoke'. Once this smoke has dispersed, the item doesn't seem to work any more... You can of course use a regulator to provide a lower (safer) voltage, but this is more wiring, more weight and yet another item to go wrong. Regulators contain magic smoke too.

LiPo packs (and Li-Ion) can also be used, but LiPos particularly feature an even higher voltage. Result - potentially more magic smoke.

MacGregor's HV (high voltage) servos are designed with motors and electronics that operate off the direct voltage of a 2 cell Li-Po, Li-Ion, or Li-Fe receiver battery pack. So there's no need for a regulator, thus eliminating a potential failure point. Naturally they can also be used with normal 5 cell NiMh or NiCd packs, but then you'd be wasting the potential power and speed.

So here's MacGregor's MG5921HV high voltage digital servo, giving an impressive 20.32 kg.cm (281.89 oz/in) of torque (stalled) when powered with an 8.4V supply (a 2S LiPo). At only a fraction over 2 ounces (just under 60gm) and in a package size of 40.5 x 20.5 x 36.5mm (1.59 x 0.80 x 1.43in) this is a compact powerhouse designed for use with large scale and aerobatic aircraft.

Nice box too...

What else is there to tell? Well, it's all metal geared, hard anodised, the output shaft is supported in two bearings, and the centre part of the case is metal, acting as a heat sink. It's terminated with a JR style plug, and the output shaft is a 25 tooth spline. Oh, and it's waterproof too.


Purchase servo online from Hobbyplastic, MacGregor's online outlet
MacGregor Industries Ltd Home page
Find a MacGregor stockist in the UK

Published: 29 Aug 2016

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