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Oct 14, 2012, 09:35 AM
Why the dirt on the wings?
moparmyway's Avatar
HS85's will work, so will HS65's and the 5085's or the 5065's and even the HS5087's !!
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Oct 14, 2012, 09:38 AM
Why the dirt on the wings?
moparmyway's Avatar
OK, so some prop testing has been done to the Turnigy 3659 (1900kv) SK3 and then compared to MEGA 22-40-1e.

Turnigy was doing pretty good @ 150 amps but the MEGA needs to be handicapped, like maybe 5 cells ..........

(6s2650 and APC 6.5x6.5 prop on each motor)
(Same ESC, batts, prop, adapter .............. only difference is each motor)
Oct 14, 2012, 10:13 AM
Registered User
FlyBillyFly's Avatar
Just thought I'd say Hi to you fellas...Still haven't Maidened the Megas yet...Into my Fall Fishin now...have been readin day to day here..just settin on the sidelines..

Take Care Guys!!!....Billy
Oct 14, 2012, 10:38 AM
Registered User
Originally Posted by moparmyway
HS85's will work, so will HS65's and the 5085's or the 5065's and even the HS5087's !!
Which servo fits and works best?
This is the setup I was going to use ..Not that fast I was told around 100-115 mph:

Himax 3514 2900KV APC 6x5.5E Pheonix ice 75
Oct 14, 2012, 11:05 AM
#who gives a rats a**?
feefo's Avatar
Originally Posted by zeus3313
Which servo fits and works best?
This is the setup I was going to use ..Not that fast I was told around 100-115 mph:

Himax 3514 2900KV APC 6x5.5E Pheonix ice 75
The HS65's and HS5065's should fit straight in the servo wells, the bigger HS85's and 5085's will need you to remove some foam.

If that's the MPX recommended motor, I thought it was good for 125mph-ish?

Anyway, the MPX servo's (nano's?) are very similar to HS65's, so on a setup for 115mph the 65's should be fine. I use the 85's, I just prefer something a bit stronger than HS65's, but use them (65's) a lot in my moulded gliders. But it also helped I had 2x HS85's in the spare's box when I built the FJU.
Oct 14, 2012, 02:49 PM
Turbine pilot
setxws6's Avatar
I'm using the HS-65hb in my 140mph ultra with no problems yet (knock on wook)
Oct 14, 2012, 03:15 PM
Registered User
piotralski's Avatar
Heat 1W-40 / 6x5 Areonaut / 4S 2200mAh / 273km/h

Oct 14, 2012, 05:05 PM
Static Model Collector LOL
Well after hitting the ground at full power, the impact was so strong that it ripped the motor mount right off

I figured the shaft on my MEGA 16/30/2.5RCE for sure was bent,

We the 5mm shaft took the hit, and asked for more
Still spins true, no wobbles.

Oct 14, 2012, 07:02 PM
Why the dirt on the wings?
moparmyway's Avatar
Sorry for your loss ............. were you flying or was a friend piloting the failed launch ?
Oct 14, 2012, 09:23 PM
Static Model Collector LOL
I was out flying by myself, 1st hand launch went well, 2nd ended well see pic

she will see flight again, but as on ultra light

New FJ Should be ready this weekend

Oct 15, 2012, 09:25 AM
Registered User
moparmyway - would you say thats the best setup for the 1900kv SK3 - 6s2650 and 6.5X6.5 ?
Any idea what that motor would do with a 7X10 and 4s ?
Oct 15, 2012, 01:42 PM
Why the dirt on the wings?
moparmyway's Avatar
Take it easy ..............
That was just static test for data freaks like me.
Whats the best setup ???? ............. MEGA (of course)

OK, seriousely, the 6.5x6.5 prop on 6s2700 (65/130) batts would be at the top of my list to fly with if I were you, then possibly 7x8 on 5 cells.

7x10 on 4 cells should be an easy no limit throttle if the motor is any good longevity wise. I would oil the bearings and make sure to re-solder or remove the stock bullets
Oct 15, 2012, 07:01 PM
Registered User
GryphonRCU's Avatar

What's the white box in the upper left of your Eagle Tree screen shots?
Is that the results from the moment in time where mouse is located?

If it's not, then can you please zoom in further so I/we can read the averaged data over the narrow time line (maybe 0.1 second before and after where you normally place the mouse).
Right now, the averaged data includes motor off time periods and are not usable for comparison.

I have installed Eagle tree's latest software on the new computer, but did not finish it by connecting the data logger (required) for first use of software....Since it has been a bunch of weeks, I better get it done soon/tonight.

Oct 15, 2012, 11:16 PM
Registered User
nofreee's Avatar
Originally Posted by GryphonRCU

I think that your setup has a fair chance of reaching your goals.....but I'm not sure about the required prop size.

Consider starting off with 75-80A static with a 1:1 prop size (diameter to pitch ratio).

If you have Graupner 5.2X5.2 post the static data before first flight and wait for feedback from the folks on this thread.

***Maybe the guys who are more familiar with that same motor on 4S can recommend a better prop.

If you have one of these APC 5X5 , 5.25X4.75 , or 5.5X4.5 then maybe that data can help the folks recommend a good prop for your first flight.

Run a heat sink and use throttle control till you get the hang of the motor temps.

Static testing:
Do only a single 3 second static test starting with the motor at room temp.
Report data from after the first any 2 of these 3 values (A, V, W)
To do another test or re-test wait till the motor is pretty close to room temp.
Be safe.

Good luck,

Finally had a chance to get everything assembled and run some tests.

APC 5x5 - 60a 850w
APC 5.25x4.75 - 70a 950w
APC 5.5x4.5 - 75a 1000w
Graupner 5.5x5.5 - 80a 1085w

However, these tests were on done on 4s 1600mah 35c batts. I need to re-solder the connectors on my 4s 2650mah nanotechs and do it again tomorrow.

This was for the following setup.

HET 2w-23
Hobbywing 80a ESC
4s 2650 35-70c
Oct 16, 2012, 12:55 AM
Registered User
GryphonRCU's Avatar

Lets see how the data changes with your bigger pack.....AND it will change.

See my attachment. Actual data from one of my tests in order to show some other folks the effects of running various size packs.

on my graph:
See the effect of battery size change on weakest prop (RPM and Watts).....then look at the changes on the highest load prop.


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