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Old Mar 29, 2012, 04:18 AM
jethack356 is offline
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Question

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, 04:41 AM
eflightray is offline
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An itch?. Scratch build.
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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.
Old Mar 29, 2012, 04:54 AM
billum is offline
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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.
Old Mar 29, 2012, 07:54 AM
flypaper 2 is online now
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And wack about 6 in. off each wingtip.

Gord.
Old Mar 29, 2012, 12:53 PM
buracho topspin is offline
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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.
Old Mar 29, 2012, 02:44 PM
rcalldaylong is offline
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Dude, I do fly all day long!
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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.
Old Mar 29, 2012, 04:54 PM
Dr Kiwi is offline
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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.
Old Mar 30, 2012, 10:33 AM
JimNM is offline
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WAA-08 THANK FRANK!
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My first step to a faster plane is to fly in a smaller area
Old Apr 01, 2012, 04:53 AM
jethack356 is offline
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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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