How can I get more speed? - RC Groups
Thread Tools
Mar 29, 2012, 04:18 AM
Registered User

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!
Sign up now
to remove ads between posts
Mar 29, 2012, 04:41 AM
An itch?. Scratch build.
eflightray's Avatar
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.
Mar 29, 2012, 04:54 AM
Registered User
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.
Mar 29, 2012, 07:54 AM
Registered User
flypaper 2's Avatar
And wack about 6 in. off each wingtip.

Mar 29, 2012, 12:53 PM
Suspended Account
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.
Mar 29, 2012, 02:44 PM
Dude, I do fly all day long!
rcalldaylong's Avatar
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.
Mar 29, 2012, 04:54 PM
Registered User
Dr Kiwi's Avatar
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.
Mar 30, 2012, 10:33 AM
JimNM's Avatar
My first step to a faster plane is to fly in a smaller area
Apr 01, 2012, 04:53 AM
Registered User
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.

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion how to get more speed(cheaply)? monboy10 Electric Power Cars 14 Jul 31, 2010 03:09 PM
Discussion How to get more speed on scale aircraft Stingeragent Pusher Prop Jet Models 7 Jun 07, 2010 10:09 AM
Question How to get more forward speed MCX? bhoges17 Micro Helis 4 Feb 19, 2009 01:26 PM
Discussion somebody can tell me how to get more rpm of one Speed 400 6 V Please????? Belfenson Electric Motor Design and Construction 8 Nov 28, 2006 07:47 PM
MVVS 26, how can i get more performance??? E-Maxx2000 Engines 1 Oct 15, 2005 09:14 PM