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Cox Engine of The Month
November-2024
Kim's

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Post  batjac Sat Aug 16, 2014 10:06 pm

Well, I got a lot of wise advice on what to do with this thing.  
My E-Streaks DSCN2079_zpsf171e156

Mostly the advice was to just throw the wing and tail surfaces into the original fuse, mount an engine, and fly the sucker.  But, if you’ve learned anything about me in my time here on the CEF, you know I don’t always follow the wise path.  I did decide to just use the original fuselage, but being me, I couldn’t just do it stock.  I still have a hankering for electrickery.  So, I went ahead and used the Hacker motor and controller I have on hand.  This is what I had to start with:
My E-Streaks DSCN2128_zps0b695792

I went ahead and enlarged the mount area for the Hacker A30-8XL motor, and I made a hole in the vertical maple stick for the shaft to stick through.
My E-Streaks DSCN2130_zps78d35f1a
My E-Streaks DSCN2133_zps5f09f190

Then I mounted the motor to a couple of pieces of 1/16 angle and mounted the angle to the engine bearers.  Afterwards I trimmed the motor mounts, but didn’t take pictures at the time.
My E-Streaks DSCN2139_zps7bf34250
My E-Streaks DSCN2140_zps86ae597c


Then, for the battery mount, I cut a slot in the wing and made a box by using a ply plate for a shear web between the spars, and boxed in the sides.  
My E-Streaks DSCN2170_zpse0c69b1c

I MonoKoted the battery area and then glued the wing in place with epoxy.
My E-Streaks DSCN2181_zps5e1ca5f3
My E-Streaks DSCN2184_zps112be45a


Then I put the motor mounts back in place and put some Velcro on to keep the battery from shifting.  I still haven’t decided how I’m going to make the Velcro strap to keep the battery in place.  Most guys use slots in the fuselage to do that, but the ARF Flite Streak fuse isn’t solid, so I can’t really afford to weaken it.  I’ll figure something out.  I mounted the speed controller under the outboard wing, and I’ll put the receiver under the inboard wing.  I just need to get some more sticky backed Velcro before I can finish that up.  But here it is mostly finished:
My E-Streaks DSCN2205_zps8e00c20f
My E-Streaks DSCN2207_zpsf08bb76a


I have several 3S 2200mAh packs on hand from electric helis, so I’ll just fly with them for now and put up with shorter flights.  I should get about 3.5 minutes with the 9x6 pusher prop that’s on there now.  If I don’t like it, I have a 10x4 prop to try, but it’s not a left handed prop.
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Post  Ken Cook Sat Aug 16, 2014 10:17 pm

Mark, does this electric stuff have more oomph than nitro? If I flew that plane on my current .25 setup that wing would fold up in flight. If the plane had some decent spars internally I would be much more confident. Ken
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Post  RknRusty Sun Aug 17, 2014 12:13 am

Here is how Watt did his Lightening Streak. A compartment inside the rib bay:
My E-Streaks Capture_zps177846ce

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Post  batjac Sun Aug 17, 2014 12:21 pm

Ken Cook wrote:          Mark, does this electric stuff have more oomph than nitro? If I flew that plane on my current .25 setup that wing would fold up in flight.  If the plane had some decent spars internally I would be much more confident. Ken

That's a possibility. I thought a good while about that. I'm thinking the bigger threat is an especially rough landing, though. After I glued the wing in place, I compared how much the outboard wing twisted and bent with pressure applied as compared to the inboard wing, and didn't see any noticeable difference. We'll see how it stands up to moderate flying. this is an experiment in progress...

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Post  Kim Sun Aug 17, 2014 1:07 pm

Looks Good! Let me know if you want me to forward any tips Patrick might have !!!
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Post  Cribbs74 Sun Aug 17, 2014 1:25 pm

Mark,

I have to say that's one of the cleanest electric installs I have seen. If batteries were more compact I would consider electric.
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Post  ian1954 Sun Aug 17, 2014 3:56 pm

I think that that will be a nice set up. I have seen a similar setup on a profile Cardinal. It has been described in Aeromodeller by John Benzin.
 
Here it is flying
 

 
A description of the electrickery is here
 

 
It sound as if you are using RC to control the motor. I would advise investing in a timer - Hubin or Renecle - The Hubin is used with an ESC that has a governer - the Renecle can be used with any ESC.
 
RC offers flexibilty but it will be easy to over run the battery. Take care.
 
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