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Old Oct 11, 2012, 12:41 PM
A&P/IA
chevronflyer's Avatar
United States, FL, Middleburg
Joined Feb 2007
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yup, positive
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Old Oct 18, 2012, 06:20 PM
Registered User
USA, CA, Valencia
Joined Mar 2011
150 Posts
All righty then. Have my Revolver close to being ready to fly. Couple of questions. I installed a Rimfire 1.20. I ran a test today. 6S 5000, CC 100 amp ESC and a 16 X 8 prop. Showed 100 amps and 2219 watts. I see on this forum a 17 X 8 does the same thing. Kind of a newbie to this stuff. What can I do to bring the amps down to about 80?
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Old Oct 18, 2012, 07:02 PM
Go fast, pull up.
Fidelity101's Avatar
United States, NY, Clarence Center
Joined Nov 2008
1,419 Posts
I am surprised that a 17x8 puts out the same amps as your 16x8. Unless he is running a lower timing, but even then, it seems odd. If you want to drop amps, you need to drop load. That means lower pitch or lower size. Pitch means more bite per revolution, which means more speed. Length generally gives me thrust.

If you want speed, go with a 14x8 or 15x8
If you want more thrust, usually for unlimited vertical, go 15x6 or 16x6

As for watts, 100-125 watts per pound should be a great starting point, unless you want a rocket plane or 3d flying plane.

Do a web search for "dc_calc" it's dc prop calc, which is a great program for helping you determine what power you will get with different configurations.

http://www.electrifly.com/motors/gpmg4505.html

According to the manufacturer, you should be at a 16x6 apc-e prop. Using a prop meant for nitro increases amp draw with minimal performance gain or loss. If you are really getting 100A on a 16x8, you might have an issue with timing being wrong on the esc or the motor is rubbing against something.
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Last edited by Fidelity101; Oct 18, 2012 at 07:08 PM.
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Old Oct 19, 2012, 02:08 PM
Wingnutz
Bill Quantock's Avatar
Canada, ON, Markham
Joined May 2009
271 Posts
Sweet maiden!

Finally maidened my Revolver 70 this morning after a nearly three year wait. (2009 Christmas present from my wife) Crosswind at about 15-20 km/h. (approx 10-13 mph) and she flew really well. Four clicks of down and we were hands-off except for gusts...handled these really well too.
Rimfire 80, ICE 100 (is this too much?) and 4500 mah 6s with 15x7 prop.
Worth the wait!
Bill
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Old Dec 12, 2012, 10:54 PM
Electric
Joined Oct 2009
92 Posts
I have mine dialed in at 160oz running the Rimfire 1.20 and APC 14x10 on 7s5000 45C lipos. Clocked at 115mph level circuits and no wind.

82.5Amps at 26.7Volts 11100RPM for 2200Watts @89.9%eff. Motor is only warm after flights.
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Old Feb 28, 2013, 06:22 PM
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P Farley's Avatar
United States, WA, Spokane
Joined Aug 2006
155 Posts
Canopy

Has anyone switched to magnets or modified the hold downs for the canopy?
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Old Feb 28, 2013, 07:19 PM
Pro Bro # 2398
GassPasser's Avatar
BoonVegas, Indiana
Joined Dec 2005
672 Posts
Quote:
Originally Posted by Bill Quantock View Post
Finally maidened my Revolver 70 this morning after a nearly three year wait. (2009 Christmas present from my wife) Crosswind at about 15-20 km/h. (approx 10-13 mph) and she flew really well. Four clicks of down and we were hands-off except for gusts...handled these really well too.
Rimfire 80, ICE 100 (is this too much?) and 4500 mah 6s with 15x7 prop.
Worth the wait!
Bill
great to hear that Bill. i just started putting my together after a year of trying to fing the time.. post some pics if you can.
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Old Mar 01, 2013, 11:36 AM
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P Farley's Avatar
United States, WA, Spokane
Joined Aug 2006
155 Posts
Ice 100

I dont think you can over ESC, it will just run nice and cool!
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Old Mar 02, 2013, 12:14 AM
More Motors, More Fun... :-)
nioa's Avatar
Phoenix, AZ
Joined Jan 2008
662 Posts
Quote:
Originally Posted by P Farley View Post
Has anyone switched to magnets or modified the hold downs for the canopy?
I use 2-56 rod and blind nut as shown in pics below. Works GREAT!

Nick
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Old Mar 02, 2013, 11:22 AM
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P Farley's Avatar
United States, WA, Spokane
Joined Aug 2006
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Good idea. I want a tool-less fast way to get the canopy off rather than installing an arming plug.
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Old Mar 03, 2013, 05:11 AM
Electric
Joined Oct 2009
92 Posts
I have a dozen flights with 7s5000 lipo and 14x10apce full throttle and have yet to have the motor, or battery more than warm. But, I have been flying in 60F weather.
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Old Mar 03, 2013, 10:53 AM
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P Farley's Avatar
United States, WA, Spokane
Joined Aug 2006
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Quote:
Originally Posted by DeadstickDuck View Post
I have a dozen flights with 7s5000 lipo and 14x10apce full throttle and have yet to have the motor, or battery more than warm. But, I have been flying in 60F weather.
What motor/ESC are you using? Thanks.
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Old Mar 03, 2013, 10:54 AM
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P Farley's Avatar
United States, WA, Spokane
Joined Aug 2006
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Never mind just scrolled up and saw your previous post.
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Old Mar 09, 2013, 12:17 PM
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P Farley's Avatar
United States, WA, Spokane
Joined Aug 2006
155 Posts
5 Cell?

I just picked up 2 big 5cell 6000Mah Max Amps lipos at a swap meet that are like new and balance perfectly...for $5 each! New they were over $300 for the pair. I fly the Rimfire 80 and knowing that I dont fly wide open with my 6 cell TP's very much, any opinions on how these might fly the plane? Anyone flown this with 5 cells?
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Old Mar 09, 2013, 04:15 PM
Watts is life...
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Bot's like to know where you live
Joined Sep 2003
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I dunno about 5 cells, that would put the amps required, at around 70-80amps. IN my opinion this planes flies with authority at 1k-watts, 1.2k is even better. 6-8 cells fits fine.

My 8-cell setup can be viwed here:
http://www.rcgroups.com/forums/showp...3&postcount=79
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