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14A Brushless Outrunner Motor 1700RPM/V
A beautifully CNC machined EnerG Brushless C28-08 outrunner type rated at 1700rpm/V having a fitted total weight of 59g including the various mounting screws onto the glass filled nylon type black cruciform faceplate. Also included is a machined aluminium four jaw collet and tapered matching propeller driver to take 6mm diameter propeller hubs, fixing by a spinner with a versatile 2.5mm T bar hole. Being 28mm in diameter, 20mm long in the body and 38mm overall depth.The motor itself weighs 51g including the three 72mm long leads terminating in 3.5mm gold connectors; the female ends are provided separately for soldering to a Speed Controller. This needs to have at least the minimum motor rating of a peak 14A though the normal working range is supposedly 8~12A yet in tests we managed to pull over 25A peak. The moral of course is to err on the generous side, keep the revs up, the ESC cooled and also the motor windings sitting in the slipstream.
Mounting with countersunk screws to our Mugi (separately available) anodised blue right angle backplate takes the weight to 55g and 59g with the spinner assembly. Slight hole relief needed to align perfectly.
Motor has a hefty 4mm shaft mounted in ball races held by allen key grub screws. It projects 14mm and includes a ground flat. Normally the collet is attached and then sits 12mm from the faceplate to the propeller rear boss.The spinner has a total length of 12mm beyond the prop face.
One of our examples has a cracked acrylic case corner (dropped during motor testing!) so a plastitc MS 5" propeller will be included in the sale.
An ideal fit for our Tea Racer design or any conventional tube fuselage design, using the cruciform mount.. Altogether a most impressive offering. Motors like this outclass the old Speed 400 brushed types and are lighter. Initial bench test results below using a three cell LiPo, referenced to a miserable range of (mostly ic power) props that were chucking about:
14.4A on APC 5.25x5.25 @ 14K rpm with 300g thrust
19A on APC 7x6 @ 12100 rpm with 670g thrust
22-25A slow-fly 8x4 @ 11500rpm with 900g thrust
26A on Microspeed @ 18Kand 580g thrust
20A Graupner 7x6 @12K and 700g thrust
As you can see thicker bladed power props are current thirsty, very in some cases.
J Perkins site lists the following:
APC 7x6.5SF 11.8A 615g thrust 79W 8k rpm @7.4V (Pete's favourite)
APC 7x5 10.3 330g " 70W 9600 @7.4V
APC 7x4SF 9.1 645g " 62W 10k @7.4V
APC 6x4 13.3 495g " 145W 16k6 @11.1V
Shows the efficiency is optimum using a two cell pack but we use a three cell.
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