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Sandancer's blog
Archive for December, 2012
Posted by Sandancer | Dec 29, 2012 @ 12:23 AM | 20,710 Views
This is my Un-Boxing and evaluation of the FMS 1400mm V7.5 P-51 Big Beautiful Doll!



I must say, I am impressed with this new FMS Version 7.5 P-51 BBD!

UP-DATE 1/11/2013:

I made up a couple of decals for the BBD. One is a more scale kill insignia to replace the rather inaccurate one FMS supplied for the port side fuse (their supposed to be swastikas not crosses). The other is the "Crew" insignia that goes on the port side engine cover.


I would estimate a normal build from box to maiden....2 hrs. max maybe? FMS has done all the work on this bird!

-The CG is 110mm from LE of the wing.
-On page 20 of the Op. manual, the high & low rates for all the control surfaces are listed.
-FMS 65A ESC w/5A SBEC
-They list a 4250-580kv motor in the manual, but mine came with the 4250-540kv motor. That will work for me.
-Battery: 4S 2600mAh, but I could see putting a 5S 4000mAh in her?
-9g servos thru-out, with the exception of the (2) 17g servos for the elevator & rudder.
-9g digital/slow motion servos for the flaps.
-9g reversed servos for the inner LG doors.
-PZ-312 E-Tracts w/full metal struts.
-The sliding canopy is a nice touch, but when it locks into the windshield frame it's kinda hard to get it back open.
-All the control surfaces have pre-installed spars with the exception of the flaps.
-The wings can be made to be 1-piece, but there was no wire harnesses.
-The new radiator scoop is non-functional. I would guess the reason...Continue Reading
Posted by Sandancer | Dec 12, 2012 @ 06:32 PM | 12,525 Views
My Motor Dyno in Conjunction with the Du-Bro Prop Balancer!




I've had quite a few inquiries about my Motor Dyno that I had posted in the Servo Testers section, so I've put together the following vid to show how I use the dyno for various functions......eg: motor/prop combinations, changes in blades-pitch adjustments (VarioProp), amp/watt/kv readings, ESC timing, prop/spinner balancing, etc.

Motor Dyno (10 min 41 sec)


As I stated in the vid, I run all my full run-up tests outdoors in a safe environment! I have a big fan out there, so I can run at WOT without fear of something overheating. So far (knock on wood) I have never had any serious incidents resulting in loss of limb or equipment!

Here are the links to the testing equipment"

Turnigy Plush 80A ESC
FrSky FLVS-01 - Lipo Voltage Sensor and Display
K1 KV/RPM meter
Watt's UP meter
GWS MT-1 Multi-Function servo tester
Overlander/Neodym Multi-Function DC meter



My Modified Du-Bro Prop Balancer.



I added four 2 1/2" risers to my Du-Bro balancer so I would have clearance for props up to 20". I know, the balancer can be located on the edge of a table to balance larger props, but I preferred this method.

I didn't want to get into the process of how I balance my blades as there are several good tutorials online for that purpose.

3 Bladed Prop Balancing for RC Aircraft

HOW TO/DIY: Balancing a 4 Blade Prop on Du•Bro Balancer

The same idea can be applied...Continue Reading