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Oct 15, 2012, 10:22 PM
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Eflite UMX Sbach 3D

As much as I enjoy the original Sbach, and given how much AS3X does for the UMX Beast, I just had to get one of these. I am very glad that I did!

I went to the club field for the maiden. The wind was 6-11 MPH. I flew with a lightweight Hyp 240 Babbelbatt first, and then with a lightweight TP 325 65c Babbelbatt. As can be seen in the video, the TP pack definitely has better vertical & top speed. I didn't get a chance to try the new Hyp 500 35c, so that will have to wait until tomorrow. Ditto for the SFGs.

As one would expect - like her predecessor, the Sbach 3D is an excellent flier. She flies as if she's on rails - even better than the V1. The basic personality of the V1 is definitely there, but this Sbach went to etiquette school & graduated with top honors! Maneuvers are graceful & fluid, yet precise. She definitely flies big.

Thrust-to-weight seems to be markedly improved over the V1 - no doubt due to lower loss in the new 4.9A ESC. There is ample power for any aerobatic maneuver. She effortlessly climbs vertically out of a hover - even with the factory prop. Unlimited rolling verticals are easy, even late into the flight. There is plenty of vertical speed, so handling remains crisp on long up-lines & she tracks like an arrow all the way up. Her vertical capability is limited only by the pilot's eyesight.

Great news! With a TP 325 all the way back, she was still just a tad tail-heavy! This means it should be easy to get the CG right with a variety of packs. I did have to widen the compartment by about 2 mm to accommodate the TP 325 pack. The front of the compartment is fine, but there is a slight step on each side of the compartment, part way back. I simply removed the step so that the battery compartment is the same width all the way back. My TP 325 & Hyp 500 packs now fit just fine. I'm thinking that the new Hyp 400 & 500 35c packs will be excellent choices for endurance flights & flying in higher winds.

Right out of the box, the Sbach 3D is a true unlimited aerobatic ship. A UM-sized plane that is equally at home doing pattern, 3D, and even IMAC-style aerobatics. I'm looking forward to seeing what she can do with a 5030 prop.

Here's the maiden. Be sure to watch in HD!

Eflite UMX Sbach 3D - maiden flight & battery comparison (13 min 22 sec)

EDIT 10/19/12:

Here are the results of my static RPM tests. Interestingly, there is no significant difference in static RPM between my Sbach V1 & 3D on a Hyp 240 pack. Of course, things may well be different when the prop unloads in flight.

RPM taken under natural light with a calibrated optical tach, 30 sec into each run on a freshly-charged pack:

Sbach 3D vs. Sbach V1
Motors: Factory originals
Elevation: 910 ft AMSL
Temp: 70 F

Sbach 3D
------------- Hyp 240 - TP 325 65c - Hyp 500 35c - Thrust (g)* ---- Speed (MPH)**

Stock prop - 10,550 ---- 10,770 -------- 11,100 ----- 99/103/110 --- 27.5/28/28.9
GWS 5030 - 11,010 ---- 11,160 -------- 11,340 --- 118/121/125 -- 31.3/31.7/32.2
GWS 5043 -- 8,910 ------ 9,040 --------- 9,210 ---- 108/112/116 -- 36.2/36.8/37.5

Sbach V1
--------------- Hyp 240 - Thrust (g)* - Speed (MPH)**

Stock prop - 10,530 ------- 98 ------------ 27.4
GWS 5030 - 11,000 ----- 118 ------------ 31.3
GWS 5043 -- 8,880 ----- 108 ------------ 36.2

For those who may be thinking about changing to the 2300Kv motor, here are the results from my Beast V1 tests:

Beast V1
Motor: 2300Kv
Elevation: 910 ft AMSL
Temp: 70 F

Beast V1
--------------- Hyp 240 - Thrust (g)* - Speed (MPH)**

Stock prop - 11,150 ----- 111 ------------ 29.0
GWS 5030 - 11,300 ----- 124 ------------ 32.1
GWS 5043 --- 9700 ----- 129 ------------ 39.5

*Calculated using the GWS prop spreadsheet
**Calculated pitch-speed. Prop slippage and in-flight unloading not taken into account.

Last edited by turboparker; Oct 19, 2012 at 04:58 PM. Reason: Added static RPM data
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Oct 17, 2012, 05:36 PM
I'd rather be flying!
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More videos

Here's some footage from yesterday.

Just messin' around a bit. Basic aerobatics, a couple of inverted flat-spins, and a few touch & goes. I'm running the factory prop & a TP 325 on this flight.

This baby does very nice power-on inverted flat-spins!

Having fun with the UMX Sbach 3D at the field (10 min 3 sec)

A comparison between the factory & 5030 props, using a Hyp 500 pack. To me, it seemed like the factory prop had an edge over the 5030. I'll let you be the judge. Be sure to watch the touch & go elevator landing at 7:06.

Eflite UMX Sbach 3D - stock prop vs. GWS 5030 (7 min 38 sec)

Latest blog entry: Eflite 2.1m Carbon-Z Cub SS

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