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Oct 20, 2003, 01:48 PM
Thread OP

Mega 16/7/8 in a Tantrum?

Okay guys, I just ordered my Tantrum and am trying not to buy another brushless motor for it unitll the spring.

I'm wondering if a Mega 16/7/8 on a GWS "F" EPS-400 gearbox on an 11x8 with Etec 1200 3S2P will power this plane with vertical.

What do you think? Should I run a different gear ratio?

Any advice appreciated.

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Oct 20, 2003, 02:44 PM
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mmormota's Avatar
I think you need a bigger Mega for unlimited vertical (the 3s2p Etec is a bit heavy too - 3s1p?).
Oct 20, 2003, 04:01 PM
Thread OP
What would a bigger Mega be?

A 16/7/7?
Oct 20, 2003, 04:18 PM
Wait for a Razor 400, gear it 5.5/1 (
and run it with a new PHeonix 10 mini and Etec 3s 1200 lipoly pack.

Oh ya, turn a GWS 10 x 8 prop. You will like this setup and it won't be too hard on the batteries. Some like to turn a larger prop with this configuration but I don't see why it is necessary.

This is what I have on my 13oz Hangover. It will go straight up a 60% throttle.

Should work great for your Tantrum. Could try a larger prop if you want to. I hope to get my own Tantrum this winter.
Oct 20, 2003, 04:54 PM
Registered User
Duane, I have one of these I ran it in my roto with a 2.8.1 mega gearbox, If I am not mistake the a.u.w. was right under 14 oz. with 1 3cell etec 1200. The plane would go up no problem and get around 12 min or so of flight. Regards! deeejay
Oct 20, 2003, 04:56 PM
Thread OP
Thanks DeeJay.

I just got the Mega metal gearbox that's a 2.8.1. I'll use that.

What prop did you use?
Oct 20, 2003, 06:21 PM
Registered User
mmormota's Avatar
Originally posted by Brain_Washed
What would a bigger Mega be?

A 16/7/7?
That's just hotter, but a 16/15/x is bigger
The /x depends on speed requirements, prop size, gear ratio etc.
Best to figure out using Motocalc and trial/error.

Mega offers a very simple gear: microgear 2.8:1 too.

A sample:
Mega 16/15/6, Etec 3s2p, gear 2,8:1, prop 12*6
11,5A , static thrust 750g, rpm 5169,
Oct 20, 2003, 06:50 PM
Registered User
mmormota's Avatar
To my previous letter: unfortunately I am not sure if the microgear is working with the 16/15/x motors. It is intended to use with the 16/7/x.

From the Mega site:

Tips and tricks

3D flying for models up to 450 g with MEGA Acn 16/15/7 :

for 3D flying for models up to 450 g with MEGA Acn 16/15/7 : recommended propeller 9x4,7 , 10x4,7"APC - the best use with 2 cells of Li Pol, or aswell with 7 cells NiCd, NiMH with recommended propeller 10x4,7"APC for model with flyingweight up to 450 g. Current consumption during flying : up to 12A . measured dates with MEGA ACn 16/15/7 for modells of 3D FLYING

recommended propeller for 3 D flying
prop 10x4,7 APC SLOW FLY
7 V : prop 10x4,7, 5700 rpm, current 13,5 A, direct drive !
8 V : prop 10x4,7, 6200 rpm, current 16 A, direct drive !
9 V : prop 10x4,7 , 6600 rpm, current 19 A, direct drive !

prop 9x4,7 APC SLOW FLY
7 V : prop 9x4,7, 6600 rpm, current 9,5 A, direct drive!
8 V : prop 9x4,7, 7300 rpm, current 11,5 A, direct drive
9 V : prop 9x4,7 , 8000 rpm, current 13 A, direct drive !
10 V : prop 9x4,7 , 8700 rpm, current 15 A, direct drive!
Oct 20, 2003, 07:17 PM
Registered User
Duane, it was the mega micro gearbox with a 10.47 apc. Regards! deeejay
Oct 21, 2003, 10:34 AM
Thread OP
Thanks Mmormota. I want to stick with my Mega 16/7/8.

Deejay, that good to know! I appreciate the info.

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