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Old Oct 06, 2013, 07:30 AM
Buzzsaw
Joined Mar 2007
165 Posts
Discussion
All you Electric Gremlin Flyers.

Would you list what motor, esc, prop, and size of battery pack you have tried and are using now. On the 48 inch Gremlin.
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Last edited by dlw151947; Oct 06, 2013 at 07:43 AM.
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Old Oct 06, 2013, 12:08 PM
Registered User
United States, MA, Oxford
Joined Sep 2009
229 Posts
I am using a Eflite 25 motor 1250 kv with a 11X5.5 prop 3c 3330 mah battery and a Pentium 60 amp ESC. I have a blast flying with this setup has enough speed and just fun to throw around, or cutting ribbons. I haven't tried it yet, but I am going to use a 4c battery with a 10X10 prop see what the difference will be.
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Old Oct 06, 2013, 01:01 PM
Buzzsaw
Joined Mar 2007
165 Posts
Quote:
Originally Posted by jt182 View Post
I am using a Eflite 25 motor 1250 kv with a 11X5.5 prop 3c 3330 mah battery and a Pentium 60 amp ESC. I have a blast flying with this setup has enough speed and just fun to throw around, or cutting ribbons. I haven't tried it yet, but I am going to use a 4c battery with a 10X10 prop see what the difference will be.
Thanks for posting what you are using. This might help with some trail and error on getting the right setup to use.
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Old Oct 06, 2013, 01:45 PM
Registered User
United States, MA, Oxford
Joined Sep 2009
229 Posts
Forgot to mention if I am flying combat we do a 4 minute combat session trying to cut the other guy's ribbon this is almost WOT. My battery is down to 3.80 in that area. Just flying for fun I can get 8 minutes plus on a flight varied throttle use.

I don't know if you saw this thread on the Gremlin so I will post the link give you more ideas on what you can do for a setup. Glad to help.
http://www.rcgroups.com/forums/showthread.php?t=1059205
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Old Oct 07, 2013, 10:42 PM
Registered User
United States, ID, Shelley
Joined Dec 2011
445 Posts
I've been using this one...
http://hobbyking.com/hobbyking/store...rnigy%203542/6

And just got this one to try.
http://hobbyking.com/hobbyking/store...rnigy%203542/4

Both using the Hobby King 60am ESC
http://hobbyking.com/hobbyking/store...C_4A_UBEC.html

And 3S 4,000mAh batteries.
http://hobbyking.com/hobbyking/store...idProduct=9510

Our combat rounds here are 1.5 minutes to start & launch, then 5 min combat flying - usually WOT. Figure my flights are 6 to 7 minutes in all, and the batteries usually are not below 75% (less than 75% capacity used).
Should probably have gone with 5,000mAh packs, but so far they are working good.

On the 6-turn motor, I've been using an APC 12x8.5 folding prop (not shown) at 500 watts.
Just did the first testing of the 4-turn motor tonight, and looks like I'll be looking at the APC 8x4 folding prop.

See prop test data in the attached "Test Sheets".
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Last edited by ddemu; Oct 07, 2013 at 10:47 PM.
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Old Oct 08, 2013, 07:06 AM
Buzzsaw
Joined Mar 2007
165 Posts
Quote:
Originally Posted by ddemu View Post
I've been using this one...
http://hobbyking.com/hobbyking/store...rnigy%203542/6

And just got this one to try.
http://hobbyking.com/hobbyking/store...rnigy%203542/4

Both using the Hobby King 60am ESC
http://hobbyking.com/hobbyking/store...C_4A_UBEC.html

And 3S 4,000mAh batteries.
http://hobbyking.com/hobbyking/store...idProduct=9510

Our combat rounds here are 1.5 minutes to start & launch, then 5 min combat flying - usually WOT. Figure my flights are 6 to 7 minutes in all, and the batteries usually are not below 75% (less than 75% capacity used).
Should probably have gone with 5,000mAh packs, but so far they are working good.

On the 6-turn motor, I've been using an APC 12x8.5 folding prop (not shown) at 500 watts.
Just did the first testing of the 4-turn motor tonight, and looks like I'll be looking at the APC 8x4 folding prop.

See prop test data in the attached "Test Sheets".
Thanks for the detail information.
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Old Oct 08, 2013, 08:41 AM
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USA, IL, Oak Lawn
Joined Apr 2007
1,424 Posts
I use a monster power 46, plush 80 esc, 4S 5000mah 25C and prop 14 x 10. Flies like a bat out of hell.
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Old Oct 08, 2013, 04:45 PM
Buzzsaw
Joined Mar 2007
165 Posts
Quote:
Originally Posted by ddemu View Post
I've been using this one...
http://hobbyking.com/hobbyking/store...rnigy%203542/6

And just got this one to try.
http://hobbyking.com/hobbyking/store...rnigy%203542/4

Both using the Hobby King 60am ESC
http://hobbyking.com/hobbyking/store...C_4A_UBEC.html

And 3S 4,000mAh batteries.
http://hobbyking.com/hobbyking/store...idProduct=9510

Our combat rounds here are 1.5 minutes to start & launch, then 5 min combat flying - usually WOT. Figure my flights are 6 to 7 minutes in all, and the batteries usually are not below 75% (less than 75% capacity used).
Should probably have gone with 5,000mAh packs, but so far they are working good.

On the 6-turn motor, I've been using an APC 12x8.5 folding prop (not shown) at 500 watts.
Just did the first testing of the 4-turn motor tonight, and looks like I'll be looking at the APC 8x4 folding prop.

See prop test data in the attached "Test Sheets".
Let us know how the 8-4 prop works out. I have the same motor, and battery in my parts bin. What did your plane weigh out ready to fly?
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Old Oct 08, 2013, 07:06 PM
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United States, ID, Shelley
Joined Dec 2011
445 Posts
Quote:
Originally Posted by dlw151947 View Post
Let us know how the 8-4 prop works out. I have the same motor, and battery in my parts bin. What did your plane weigh out ready to fly?
All of my Gremlins (both glow and electric) finish out at 3.5 pounds, and I've been shooting for 500-watts of power (as achieved with the 3542-6 with the APC 12x8.5 folding prop).

Wanted to try the 4-turn motor to reduce the prop size, but going all the way down to 8" was a little unexpected. From the listing, I thought it would likely need a 10" prop. I currently don't have a 8x4 and my hobby budget is low, so it might be a little while before I can test it.
The 8x6 will give plenty or power, but I also need duration.
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Old Oct 09, 2013, 05:56 AM
Buzzsaw
Joined Mar 2007
165 Posts
What I'm trying to do is to come up with a (cheap reliable motor) that will run on a 3-cell 3000-3300 pack so all planes and equipment will be equal. Our first Gremlin contest back in 1994-95 had 11 flyers flying glow. We didn't fly 1 on 1 we flew all at one time. We did this for several years. Then a few years ago our group started flying Fanfold WW2 planes then went to the F&F I came up with. We did this until we over combated ourselves for several years. So I'm thinking the Gremlin might be the ticket again to get everyone cutting some more streamers. This is the reason for starting this thread.
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Old Oct 09, 2013, 06:23 AM
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United States, MA, Oxford
Joined Sep 2009
229 Posts
I can agree with you on wanting to use the same batteries in different planes. I use the same batteries in three other planes. Also when we have the Gremlin combat the electric is limited to to a 3c battery.
For safety we fly in a section of the field so the combat is kept in a fairly tight area away from the flight line. Constant turning trying to get a cut which is nice and exciting for the 4 minute that is allowed for each round. Then a spot landing closes to the mark picks up a point.
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Old Oct 09, 2013, 06:56 AM
Buzzsaw
Joined Mar 2007
165 Posts
I have been eyeing this motor with a 3-cell pack. I don't know if anyone has tried it yet or not. It really looks pretty good with 740 watts and 1100 kv.

It might be close to a .28 glow.

Propeller Test Data for the Power Up 25 Speed Motor:


Battery Size Propeller Size Thrust (oz.) Amps Notes
3-Cell 11.1v APC 11 x 5.5E 77 oz. 49 amps
3-Cell 11.1v APC 10 x 5E 69 oz. 42 amps
3-Cell 11.1v APC 10 x 7E 68 oz. 47 amps
3-Cell 11.1v APC 9 x 6E 56 oz. 35 amps
3-Cell 11.1v APC 9 x 7.5E 53 oz. 45 amps
4-Cell 14.8v APC 9 x 4.5E 83 oz. 47 amps 740 watts
4-Cell 14.8v APC 8 x 4E 56 oz. 36 amps
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Old Oct 09, 2013, 08:51 AM
Registered User
United States, ID, Shelley
Joined Dec 2011
445 Posts
Quote:
Originally Posted by dlw151947 View Post
What I'm trying to do is to come up with a (cheap reliable motor) that will run on a 3-cell 3000-3300 pack so all planes and equipment will be equal. Our first Gremlin contest back in 1994-95 had 11 flyers flying glow. We didn't fly 1 on 1 we flew all at one time. We did this for several years. Then a few years ago our group started flying Fanfold WW2 planes then went to the F&F I came up with. We did this until we over combated ourselves for several years. So I'm thinking the Gremlin might be the ticket again to get everyone cutting some more streamers. This is the reason for starting this thread.
The Turnigy 3542 motors and other equipment I listed will serve this purpose well. I stayed with the 4,000mAh batteries as I had/use them in another plane, but they sell for $25, with the motor and ESC each being under $20.

Going with a 3,000-3,300mAh battery will just shorted the flight time a little, but may still get the 4 minutes mentioned in another post.

I'm new to combat, and am flying in South-East Idaho, with the group mentioned/discussed in the R/C Combat column in this past issue of Model Aviation. We also fly all-up so sometimes start with 8-9 planes in the air at one time.
Some of these guys fly HOT-rods that I'll never keep up with, but the performance of my Gremlin prompted one veteran flyer to finally build the Gremlin kit he has had for several years(although he's strictly a glow guy).

Flying with all the planes being more uniform would be FUN!
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Old Oct 09, 2013, 08:57 AM
Buzzsaw
Joined Mar 2007
165 Posts
Thanks for your input and getting back. Cheap equipment that's we are looking for.
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Old Oct 09, 2013, 09:32 AM
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USA, IL, Oak Lawn
Joined Apr 2007
1,424 Posts
Mine is heavy at 4.5 lbs. in no wind it makes for interesting launches. I get 5 1/2 min flight times.
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