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Old Sep 11, 2014, 02:18 PM
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United States, MA, Melrose
Joined Aug 2007
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Herr Mini-Sport Build

Working on a Mini Sport. Quite a cool little plane, lots of customization options too.
I need y'alls help deciding on a power system.

Here is what I have been thinking about:
EMAX CF 2822 BRUSHLESS Outrunner 1200kv
40A ESC (just going bigger for use on other planes in the future - is this a bad idea?)
GForce 20C 2200mah LIPO 3S 11.1v
In the end it will probably swing a 7x6 slow flyer prop, or maybe an 8x4 or 8x6 - if bigger is needed, we'll go bigger - perhaps a slow flyer 10x?

I am a newbie to electric kits, and I really don't get all of it yet (I am reading up as fast as I can). I have a feeling that this will be way too much power for this little plane, but I am going to to some mods to it, so AUW should be a fat 14 - 16 oz. I would guess that more power is better with a little sport plane?

Your suggestions please!!
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Last edited by spencermcginnis; Sep 11, 2014 at 04:57 PM.
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Old Sep 13, 2014, 03:58 AM
Condescending Pedant
Joined Aug 2013
819 Posts
I would not use the 40 amp ESC mainly because it is heavier than required. If you buy another larger motor, buy the ESC for that. You can keep the smaller ESC with your Emax motor whatever plane you put them in.

The motor looks like a good match to the plane, (actually over powered, but most people like to do that anyway) but I would not use the slow flyer props. APC recommends a max speed of 65,000/diameter which is around 8,000 for an 8 inch prop. You will be slightly above that with your motor. The APC E type props will work better at those RPM levels and will load your motor less too.

I found this listing from Value Hobby. I have never ordered from them so cannot say anything about their customer service or anything. The do have a recommended setup for your motor though. Link below.

http://www.valuehobby.com/emax-cf2822-outrunner.html

It looks like you better look for a prop adapter too, as they say one is not included.

Let us know how you like the Herr Plane. I have been tempted to buy one just to see how well the kit is put together.
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Old Sep 14, 2014, 09:02 AM
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Thanks a lot! I had just come across the same thing at Value Hobby, but the first time I hadn't noticed the recommended setup.
I also found the fantastic article, "Everything You Wanted To Know About Electric Powered Flight" by AEAJR over at Wattflyer.
Thank you SO very much for your response! Advice taken!
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Old Sep 14, 2014, 09:24 AM
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Photos: Rudder, Stabilizer, Fuselage

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Description: Okey doke, here we go. On to the wings!
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Old Sep 14, 2014, 12:53 PM
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United States, MA, Melrose
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One question for you boys.
I covered the marking for the stabilizer cut in when I added the sheeting to the rear of the fuselage.
Does anyone have a new kit that they could snap a photo of the fuselage piece with these markings?
Worse comes to worse, I can take an educated guess and cut it from there.
Thanks for the help guys!
SM
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Old Sep 15, 2014, 01:00 AM
Right Rudder
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USA, FL, Orlando
Joined Nov 2010
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Spencer,

Nice build. Try visiting my old 2003 vintage build thread when I had the guapoman2000 account.

http://www.rcgroups.com/forums/showthread.php?t=150944

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Old Sep 15, 2014, 01:01 AM
Right Rudder
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Videos

http://www.rcgroups.com/forums/showp...&postcount=120
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Old Sep 15, 2014, 03:11 AM
Condescending Pedant
Joined Aug 2013
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Spencer, I notice your kit has counterbalanced control surfaces while PittsSpecial's does not. Did you make that mod or did they change the kit over the years?
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Old Sep 15, 2014, 06:01 PM
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Making progress

I have a completed fuse, save the radio equip and power package. Finished one wing, pretty proud of the wing tip and the extra strength dowel I inserted. Hope it didn't add too much weight, but my power pack should be able to compensate for any additional ounces.
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Old Sep 15, 2014, 06:03 PM
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Mike, I'm not sure, but I think your talking about the extra area I added to the control surfaces? If yes, that was my modification, I really wanted it to look like a Hughes h1. Also I heard some saying tat this plane had a tendency to be sluggish without ailerons, so I thought a little extra wind pushing it around couldn't hurt. We will see when it's in the air!
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Old Sep 15, 2014, 07:28 PM
Right Rudder
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USA, FL, Orlando
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Quote:
Originally Posted by spencermcginnis View Post
Mike, I'm not sure, but I think your talking about the extra area I added to the control surfaces? If yes, that was my modification, I really wanted it to look like a Hughes h1. Also I heard some saying tat this plane had a tendency to be sluggish without ailerons, so I thought a little extra wind pushing it around couldn't hurt. We will see when it's in the air!
If you build it perfectly and exactly like what Tom Herr recommends (Recall that Herr Engineering existed in Titusville, Florida) and the one I owned and flew was a prototype from testing with Tom Herr's test Pilot, Mr. Mark Shiemi of Titusville and who gave me the model.

I have had nothing but, very responsive rudder and even was able to have sustain inverted flight with just Rudder & Elevator.

Please don't misunderstand me here, I am saying that if you build the model exactly like what Tom Herr designed it, the model is one heck of a mild SPORT flyer. I believe you are perhaps the third person to perform extensive modifications and that's okay as it "is" your model but, the model in its true design is a great flyer and I must disagree with your views about being Sluggish in its original intended design.
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Old Sep 15, 2014, 08:01 PM
Right Rudder
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USA, FL, Orlando
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Quote:
Originally Posted by spencermcginnis View Post
I have a completed fuse, save the radio equip and power package. Finished one wing, pretty proud of the wing tip and the extra strength dowel I inserted. Hope it didn't add too much weight, but my power pack should be able to compensate for any additional ounces.
Carry-On Spencer!

I really like these mods you have incorporated in your build.

If I get another one, I will do the same!

You do realize that this model's design was extended to the E-Flite mini-Pulse and perhaps others.
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Old Sep 16, 2014, 09:55 AM
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Originally Posted by PittSpecial View Post
Now that's a nice flyer! Beautiful!
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Old Sep 16, 2014, 10:08 AM
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A few more pics and a little more progress

Glued right wing, just waiting to sand it out.
Created some new and very light landing gear that should hold up to my tendency to slam it on the landing, haha.
Also added battery compartment and hatch.
I am thinking about making the wing fixed so that I can add some wing fillets like my favorite h1- this would require I have this battery hatch, but nonetheless, the hatch saves me from re-winging each time I need to change batteries.
Good idea? Bad idea?
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Old Sep 16, 2014, 10:14 AM
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Hatch video link

http://youtu.be/SZG9YUjD_LM
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