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DWE Micro P-38

Old 01-16-2005, 01:08 PM
  #1  
Greg Covey
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Default DWE Micro P-38

[link=http://www.slowfly.com/index.chtml]Dynamic Web Enterprises (DWE) and Dynamics Unlimited (DU)[/link] have combined forces to create a single place for your micro-flight needs. The latest kit offering is their new [link=http://www.slowfly.com/cgi-bin/shop.cgi?store=%2313900&view=%23469147]Micro P-38[/link] twin motor scale airplane.

The Micro P-38 kit comes with all the pre-cut foam parts shown, motors, props, and spinners. When combined with the RFFS100 module, a 250mAh Lithium cell, and two magnetic actuators, you get 3-channel proportional control with a built-in speed control to power the twin M20 motors.

Specifications:
[ul][*] Wingspan: 19"[*] Length: 13"[*] Wingarea: about 52 sq. in.[*] RTF weight: Under 2oz[*] Two 1.9ohm M-20 motors w/props and spinners included
[/ul]
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Old 01-16-2005, 01:20 PM
  #2  
Greg Covey
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Default RE: DWE Micro P-38

The DWE Micro Servo Actuator Set is for control surface mounting. It comes in a set of 2 acutators and plugs right into the RFFS100 module with no soldering required. The weight is 1.1 grams each including the magnets. By adding the servo inserts, you can provide the "arm" normally used by larger conventional servos. This can be used to move the magnetic actuator forward and connect to the control surface via thin carbon rod. The servo inserts also provide perfect alignment of the magnets to the coil. You must cut the inserts out of the mold, assemble them, and insert them into the micro-actuator coils. Please be careful as these the tiny parts can be delicate. The inserts are sold in pairs. The BS inserts weigh 0.12 grams each.

I measured all the foam parts together to be 1.0oz before painting.
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Old 01-16-2005, 05:16 PM
  #3  
66tbird
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Default RE: DWE Micro P-38

Looks good. I will get one when I find out how to paint it. Real light that is[8D] Hope there are more desings coming.
Old 01-17-2005, 11:16 AM
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Default RE: DWE Micro P-38

To paint the white foam parts, you can use an air sprayer that can apply a diluted solution of paint to keep things light.

If you don't have an air sprayer (like me) then you can try using a thin layer of acrylic water color paint and then detail the P-38 with a black felt tip Sharpie pen.

I painted my micro P-38 with metalic silver paint from Michael's Craft store. The 8-color Delta Ceramcoat Acrylic set only cost a few dollars. It is non-toxic and foam safe. (SKU #02 937 0056 0198)
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Old 01-17-2005, 11:17 AM
  #5  
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Default RE: DWE Micro P-38

The motor and prop are simply press fit into place. I painted the supplied spinners red and then pressed it onto the prop hub. No glueing is needed here for the entire motor mount procedure. Even the completed assembly simply presses into the fuselage tube.
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Old 01-17-2005, 11:47 AM
  #6  
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Default RE: DWE Micro P-38

The center pod holds the proper dihedral into the wing. I used a thin layer of 5-minute epoxy and held the pod in place until the glue set.

Note that the fuselage sections have left and right side offsets for the wing dihedral. This keeps them vertically oriented when glued to the wing.
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Old 01-17-2005, 11:41 PM
  #7  
Hotshot87
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Default RE: DWE Micro P-38

This is a great plane!!! Would love to get more info on it. Especially where I can get one...
I went to the DWE web site and found no info on it ....PLEASE HELP!!!!

Scott
[email protected]
Old 01-18-2005, 09:33 AM
  #8  
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Default RE: DWE Micro P-38

Scott,

You're right. It may be worth calling DWE or DU. I suspect that they will be available shortly.

Although my RFFS100 module came with a long wire antenna, I decided to use the loaded Azarr M-72 Indoor antenna from [link=http://www.ecubedrc.com/antennas.htm]E Cubed R/C[/link].

Before mounting my fuselage to the wing, I cut away the elevator and mounted it to the horizontal stab using the supplied rubber hinge material in the DU magnetic actuator kit. I simply cut out 1/8" slot in both ends and glued the rubber pieces in place using a dab of 5-minute epoxy. Note that the use of only 2 rubber hinges will prevent binding and put a minimal load on the actuator.
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Old 01-18-2005, 09:40 AM
  #9  
Greg Covey
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Default RE: DWE Micro P-38

To mount the fuselage pod sections to the wing, I first glued the horizontal stab in place. This required a tiny slice in the fuselage sections for a snug fit to the stab. A small amount of UHU POR (or Hart) was used to hold the pieces in place. The fuselage tail already has a cutout section to match with the horizontal stabilizer...much like the old Lincoln Logs. This step allows you to keep the fuselage sections in parallel to locate the proper position of the forward end on the wing.

I created a 1/2" bed of scrap tile and balsa to allow the frame to sit properly positioned while the glue dried. After gluing the wing bottom to the fuselage pod and then gluing and pressing the top hatch onto the wing, I held the hatch in place with a small panel nail. A pin would work fine here too. I used UHU Por to glue the pieces together and let it dry overnight.
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Old 01-18-2005, 09:53 AM
  #10  
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Default RE: DWE Micro P-38

The two motor pods simply pressed into place. I first drilled a small hole for the wires to come out the bottom side toward the center pod. I then drilled two more holes to run the wires into the pod. This worked out nicely because I could use the stock wire that came soldered to the motors and connect to the RFFS100 module without any soldering. I was also able to stuff both sets of wires into the receptor pins.

Note that before positioning the RFFS100 module in the center pod, I pressed the Azarr antenna onto the receptor pin and fed the antenna wire out the stock hole in the rear of the center pod. The RFFS100 module is wedged into place with a tiny piece of balsa.
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Old 01-18-2005, 10:16 AM
  #11  
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Default RE: DWE Micro P-38

The P-38 should be avialable on the website now. However, we do not have construction notes for it as of yet (Greg is actually do them for us and it looks like most of it is going on here) so just be aware of that if you order one. It will also only be strictly the kit (with motors included) as we have not had time to assemble an "all required parts" list yet but Greg will probably list most of the stuff here that will be required but not part of the kit.
Old 01-18-2005, 11:55 AM
  #12  
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Default RE: DWE Micro P-38

Thanks for the update, Dan.

It looks like you can find the new P-38 model [link=http://www.slowfly.com/cgi-bin/shop.cgi?store=%2313900&view=%23469147]here[/link].
Old 01-18-2005, 01:55 PM
  #13  
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Default RE: DWE Micro P-38

Greg,

Just a few questions. Is this AET or RET control?
and Second, at 2oz. Is the wing large enough to fly in door? We have some 5oz A/C floating around. I was hoping this would work.



Last thing, a bit off topic, regarding the RFFS-100. are the actuators proportional? I've heard from some that you cannot make an actuator as such... It's all or nothing?
Old 01-18-2005, 02:49 PM
  #14  
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Default RE: DWE Micro P-38

Ray,

The P-38 is RET although there isn't any reason you couldn't do AET if you can figure the linkages for the ailerons. It can be flown in a larger sized gymn. I have video of the prototype flying outside as well as inside at http://www.dwedesign.com/Video/p38Web.wmv . It was very windy outside and it looks like the video got chopped off at the end which I will have to fix once I get home.


The RFFS-100 is fully proportional. It is possible to make an actuator proportional by varying the amount of current flowing through the coil. We were the first to incorporate the principle into a "mass" produced receiver.

Regards
Old 01-18-2005, 09:09 PM
  #15  
Tim Wolff
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Default RE: DWE Micro P-38

I lost control after I saw the video. Ordered two! Hurry up an finish yours. We'll need to pick your brain.
Old 01-19-2005, 10:07 AM
  #16  
Greg Covey
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Default RE: DWE Micro P-38

The servo inserts, in my feeling, really make those nasty magnetic actuators workable. Not only due they keep the magnets centered inside the coil but they also eliminate the need to re-align things if the plane gets bumped. The control rod approach to magnetic actuators works very well and I have used it on many other micro-flight models successfully.

The servo inserts installed very well with little effort. Simply attach a magnet to each side of the center piece and then insert the center piece into the housing by opening it up a bit. I touched a couple tiny drops of medium CA, using a toothpick, on the insert housing where it meets the coil. I then dabbed a small touch of CA Kicker to harden it fast.

Since the kit does not include linkage, I created some tiny control horns from a piece of thin plastic.
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Old 01-19-2005, 10:48 AM
  #17  
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Default RE: DWE Micro P-38

Greg,

What's the weight on that actuator setup?
Old 01-19-2005, 11:27 AM
  #18  
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Default RE: DWE Micro P-38

Ray,
Each actuator with housing weighs aprox 1.2 grams.

Dan
DWE
www.smallrc.com
Old 01-19-2005, 12:29 PM
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Default RE: DWE Micro P-38

Thanks dan.

I found some inspiriation for an aileron idea. I saw a picture of a pull-pull with string to the rudder of a micro flyer. I think it can be easily set up to run the ailerons off one servo or actuator. In the really crappy pic i slapped together. You run two strings off each side of the servo or actuator and on one side you flip the strings. At the point in the wing where you need to go 90* either pop to pin holes in the rib and CA or for foam or option to CA. a tiny pice of a plastic tube... a grommet of sorts. Just something to prevent wear on the string and to stop them from sawing through the wing. Crude, I know, but might work? I'm gonna try it on my Pitts with Cirrus MJ servo. and I'll report back.
Old 01-19-2005, 12:32 PM
  #20  
Greg Covey
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Default RE: DWE Micro P-38

or 0.04oz in my world.

The two housed actuators adds about 0.1oz without linkages. Not bad when you consider a single $50 sub-micro servo weighs double that amount.
Old 01-19-2005, 01:08 PM
  #21  
Mike Taylor
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Default RE: DWE Micro P-38

Ray,

Another idea to consider for ailerons with the MJ servo is to run a single length of .080" guitar string through lengths of the teflon tubing you can buy for making CA dispenser tip. A piece of .020" brass rod 'Z' bent (sort of) gets attached to the MW with heat shrink tubing and fixed in place with CA. Gentle curves in the teflon tubing allow the wire to slide back and forth without undo friction. Horns acan be attached to the ends of the wire in the same way the brass rod shuttle gets attached to the center of the wire to engage the servo.

I find pull-pull to be a PITA, and this was easier to rig up. WIth gentle curves, friction is reasonably low...

The first photos shows the servo. The teflon tube runs through the ribs along the spar. The second photo shows the teflon/wire exitting the tissue, and the third shows (poorly) the horns and aconnections.
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Old 01-19-2005, 01:29 PM
  #22  
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Default RE: DWE Micro P-38

The exposed guitar string to the Z on the control horn is strong enough to push the control surfaces? If that's so then wow... Luckily I have a brother with almost as many guitars as I have airplanes! I will do some testing with this tonight. I'm looking to have fun with the Micro Pitts. This might just be the ticket.
Old 01-19-2005, 02:37 PM
  #23  
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Default RE: DWE Micro P-38

Ray,

Keep the exposed run short and straight. I forget if it was .080" or .010". Test the fit and friction in the teflon tubing and decide which one works best.
Old 01-19-2005, 04:43 PM
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Default RE: DWE Micro P-38

Dan Hurd reminded me that I was also in charge of the manual on this little warbird so I created a more complete set of specifications:

Specifications:
[ul][*] Wingspan: 19"[*] Length: 13"[*] Wingarea: about 52 sq. in.[*] RTF weight: Under 2oz[*] Two 1.9ohm M-20 motors w/props and spinners included
[/ul]
Old 01-20-2005, 10:39 AM
  #25  
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Default RE: DWE Micro P-38

To create the elevator linkage, I used a thin carbon rod, a piece of the supplied solid wire, and some scrap wire insulation. My friend, Paul Weigand, showed me how to reshape the carbon rod without cutting. It is important to keep metal linkage away from the strong rare earth magnets in the actuator so I decided to make a right angle bend in the carbon rod to attach to the insert arm.

The carbon rod can be manipulated through heat, and, after it has cooled a bit, it can be strengthened via CA. I used a small tip soldering iron to directly press the rod and bend a right angle. You can also heat a razor knife blade and use it to apply heat to the carbon rod. After holding the right angle in place for a few seconds, I applied a small amount of thin CA to the joint, followed by a small dab of kicker. The result was a strong non-metalic right angle.

I then drilled a hole in the plane with a bit such that it allowed my carbon rod to enter from the front of the fuselage and stick through the hole on its way to the elevator.

The actuator was mounted on two small pieces of Depron foam so that it could sit level. I ran the thin wires through the fuselage hole previously made for the motor wires, attached the carbon rod to the swing arm, and slid the assembly back into place. Once the actuator was positioned properly, and I tested the carbon rod for a good swivel, I used a small amount of UHU Por glue to secure the actuator base to the fuselage inside. A "Z" bend is not required in the carbon rod at the actuator end because the travel of the rod inside the fuselage favors one side. You can simply connect the control to the actuator arm using the slight force of the rod direction to keep it attached.

Be sure to slide the assembly back enough so that the motor pod can be pressed into place.
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