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Old Mar 29, 2012, 03:18 AM
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How can I get more speed?

Hi guys. I have this Mugi(see attachment), which has a 48" span X 24" length and weighs approx 1.5 pds flying weight. I'm running a Electrafly Ammo 2845 2700KV
motor, 60amp esc, 3s 3000mah lipo and a 6 X 4 prop which I know is too much prop for that motor. The motor , however seems to be holding up nicely though.
I'm guessing I'm getting speeds in the 60-70 mph range with that setup. I'm not that
knowledgeable about motor setups, so here is the question. Can somebody recommend a setup that might give me some more speed? 100mph would be nice!
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Old Mar 29, 2012, 03:41 AM
An itch?. Scratch build.
eflightray's Avatar
South Wales U.K.
Joined Mar 2003
12,908 Posts
Speed usually comes from pitch and rpm, you could try some of the APC Thin props.

They do a handy range of 4.75" to 5" diameter. If you drop below that 6" prop and increase the pitch, you should hopefully get slightly more rpm, and a better pitch speed.

Cheaper than changing the motor or going up another cell to 4s.

But if you want a lot more speed, change the motor, change the prop, change the Lipo pack, and probably change the plane. High speed comes at a cost.
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Old Mar 29, 2012, 03:54 AM
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A cheap experiment would be to cut out the piece of wing directly behind the prop which can't be doing any favours to the airflow from the prop. Will cut the noise too which must be wasted energy.
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Old Mar 29, 2012, 06:54 AM
Canadian Bacon
flypaper 2's Avatar
Kingston, Canada
Joined Jun 2004
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And wack about 6 in. off each wingtip.

Gord.
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Old Mar 29, 2012, 11:53 AM
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In the words of Tim Taylor, "More Power".

Higher KV motor driving a larger, higher pitch prop. You don't necessarily need a larger battery but it will need to be able to deliver the required amount of power. That's about it except that you will reach a point of diminishing returns where excess weight will overcome the ability to actually fly the thing.
It will transform from flying wing to powered brick.
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Old Mar 29, 2012, 01:44 PM
Dude, I do fly all day long!
rcalldaylong's Avatar
San Jose, California
Joined Dec 2007
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I'd say if you have a nice flyer, keep it that way and build another one purely for speed. You see....that's why I now have 20+ planes...

when you get to 100+ mph, you'll need to beef up the airframe, beef up your elevons, beef up your servos (otherwise if not enough torque, you won't pull up in those 100+mph speed dives and yep it'll be a lawn dart...don't ask me how I know), and yea...beef up your motor/ESC/Lipo. With all that, you'll have a fast flying brick. So really...start with a new airframe...probably faster and easier.
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Old Mar 29, 2012, 03:54 PM
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You probably want something which can swing a 7x7 or similar prop to get you lots of thrust as well as speed... but you'll need 500W -600W to do it.

An ARC 28-47-1.5 can get you 119mph pitch speed with a Zagi Carbon 5.1x4.9 on 3s (39.70A/426W)... and that's 34.86oz thrust.
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Old Mar 30, 2012, 09:33 AM
WAA-08 THANK FRANK!
JimNM's Avatar
Las Cruces, New Mexico, United States
Joined Jun 2002
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My first step to a faster plane is to fly in a smaller area
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Old Apr 01, 2012, 03:53 AM
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Thanks for the suggestions. I put a different prop on it and got some more speed. But I also started to get some elevon flutter. So, maybe I'll just leave it as is.
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