KDE Direct KDE7215XF-135
Series: KDE Direct Brushless motors for drones
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The KDE Direct KDE7215XF-135 is a heavy-lift motor (24N22P) with 0.2 mm laminations for systems from 6S LiPo to 14S LiHV with 27.5-inch two-blade propellers. KDE Direct is a US manufacturer of drone drives. The stator class 7215 stands for 72 mm diameter and 15 mm height; the motor weighs 555 g (640 g with cables and connectors) and measures 80.8 x 49.5 mm.
At 135 KV the motor turns roughly 7,000 rpm unloaded on 14S at 51.8 V nominal. The thin stator laminations reduce eddy-current losses and help efficiency. For 180 s KDE quotes 2,915 W at 45 A, with at least 5 mph (about 8 km/h) of airflow over the winding. The recommended propeller is the KDE CF275-DP at 27.5x8.9 inches. The voltage runs from 22.2 V (6S LiPo) to 60.9 V (14S LiHV), and 6 to 14S is permitted.
KDE tested the motor with two- and three-blade propellers of 24.5, 27.5 and 30.5 inches from 6S to 14S. The maximum thrust of 13,445 g comes from the KDE test stand at 3,500 ft altitude: 58.8 V (14S), two-blade propeller 24.5x8.1 (CF245-DP), 61.3 A and 3,607 W. The test current is about 36 % above the 45 A of the 180 s limit, so the thrust is a short-term value. The 14,745 g for sea level is an extrapolation by KDE. At the maximum point this is 3.73 g of thrust per watt, and clearly more in a hover at part load. The test-stand result is not directly comparable with measurements from other makers.
With a voltage range that more than doubles from 6S to 14S, the controller (ESC) belongs to the selection as much as the propeller does: it must carry the chosen cell count. Wear points are the bearings, the shaft and the magnet seat; with 27.5-inch propellers good balancing matters. Anyone carrying a 14S pack has exceeded the 160 Wh limit for passenger aircraft at about 3 Ah.
Technical data
Other data
| Cell count (S) | 6-14Scorrect |
|---|---|
| Dimensions (mm) | 80.8x49.5correct |
| Efficiency at maximum thrust (g/W) | 3.73correct |
| KV (rpm per volt) | 135correct |
| Maximum current (A) | 45correct |
| Maximum power (W) | 2,915correct |
| Maximum thrust (g) | 13,445correct |
| Maximum thrust test condition | 58.8V (14S), 24.5x8.1 Zweiblatt (KDE-CF245-DP), 61.3 A, 3607 Wcorrect |
| Power rating time base (s) | 180correct |
| Recommended propeller | KDE-CF275-DP 27.5x8.9correct |
| Slots and poles | 24 (24S22P)correct |
| Stator diameter (mm) | 72correct |
| Stator height (mm) | 15correct |
| Stator size | 7,215correct |
| Thrust at sea level, estimated (g) | 14,745correct |
| Weight (g) | 555correct |
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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