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Guillows kit #905 - P51D Mustang Conversion.

Old 11-13-2011, 08:36 PM
  #1  
gspd
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Default Guillows kit #905 - P51D Mustang Conversion.

New member here, long time lurker. I have been on the forums checking things out for a little over a year. I have been building balsa models for around 9 years.

Additional info on the build:

Balsa - Using kit wood for fuse and a few misc parts. Replaced wing rib and stringer balsa with midwest balsa because of the poor quality included in the kit.

Tissue - Esaki Japanese with one cote 60/40 dope thinner mix.

Glue - 30% Elmer's White, 40% Titebond, 30% Water.

Control's - I will use carbon fiber for pushrods with music wire z bends for servo connections.

Electronics -
* DSM2 micro-rx(4 channel) 2 g
* Ultra-Micro Servo 2.2 g (x2 Rudder / Elevator)
* Brushed DC GPS-7 motor 3.3 g
* 3A micro ESC 2.5 g
* GWS 5030 prop
* 1S LiPo 150mAH

Build info planned:

I will skip two of the gear wing ribs, along with replacing some of the components. The plane will utilize no landing gear, however the nose will be sheeted along with 1/4 of the center bottom wing with 1/32 balsa.

I guess my main goal is to keep the total weight under 1.25 oz. Progress will be monitored and documented with digital scale updates included. Comments and critique are appreciated!

PS - Cant upload images right now due to thread count being so low.
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Old 11-14-2011, 02:52 AM
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Wow!

This thing sounds "Super Micro +++"

Looking forward to the build.
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Old 11-14-2011, 10:51 AM
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Most of the plan construction is finished.

I oversized the horizontal stabilizer by around 20%. I am going to rebuild the rudder and oversize it as well for more control. However at this point I am considering making the rudder fixed and possibly using ailerons. Not to sure at the moment.

Suggestions?

The old saying keep it simple stupid (kiss) comes to mind and tells me just use rudder and h stab.
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Old 11-14-2011, 10:55 AM
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Default Cont.

Also, another update - Most of the plan based build is finished. Pics to come.
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Old 11-14-2011, 10:59 AM
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Pics to this point so far.
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Old 11-14-2011, 11:56 AM
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I'm a pretty big believer in the KISS principal myself.


Plane looks good so far.
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Old 11-15-2011, 01:09 AM
  #7  
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Thanks offtom!

Update - Sanded rough spots on the wings an flushed surfaces. Fixed some weak joints. Also sanded the h stab. Working on beefing up the rudder a little and making a new control surface for it.

I am also starting plans on a hatch to access the battery and electronics. It should be pretty easy since everything will be CG of the wing forward.

Until next time... tips / suggestions?
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Old 11-20-2011, 12:57 AM
  #8  
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I don't know how many people are following this build, honestly I considered finishing it without posting but here is the update anyways.

Finished rebuilding the h stab and rudder yet again (third time).

I got all the components sanded, and I have checked fitting with the fuse.

I have also gathered some components I had laying around and some I received in the mail. I chose to swap to a brushless TURNIGY MicroMotor 16-06 3000kv. I also swapped the ESC for a brushless blue arrow 6amp. I removed the plastic shrink wrap from the ESC. I am going to directly solder the motor to the ESC.

Here are pictures of the gear which I will begin fitting into the fuse. I will also begin covering the tail section and wings.

Electronics are 17.4 grams.
Plane is 10.9 grams.

That puts me around 1oz so far. Hopefully I can keep the weight under the projected goal with the new goodies.

Until then, pics with weights as promised.
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Old 11-20-2011, 06:31 AM
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Going bl is probably a good idea. Building these things brushed is difficult, as the weight adds up quickly. You can always get creative with lightweight linkage, and have ailerons for little weight penalty. I built the Stuka with a .015" music wire setup for the ailerons, driven from a bellcrank that also drives the rudder, and therefore have both coupled together. One of the best flying small planes I've ever built. The flat wing would be a good bit easier for routing the wire, than the gull wing was. The tailwheel steers from an aluminum crimp as a takeoff from the rudder pushrod, barely visible without a microscope.
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Old 11-20-2011, 07:09 AM
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Welcome to Wattflyers GSPD, I agree with going to a brushless motor ver brush, more power for the same weight, and if the plane comes out a little heavy, its no problem with a brushless motor it will be able to handel it with no problems, waiting for the videos Take care and have fun, Chellie
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Old 11-20-2011, 01:10 PM
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I'm still watching,
I don't know how you guys work in those tiny spaces. My big old fingers would be breaking everything


I'm looking forward to seeing the finished project.
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Old 11-20-2011, 09:47 PM
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Carbon Fiber connecting rods attached, along with music wire z bends on flight control sides.

All electronics installed and tested.

Motor was installed with traditional angles. I built a 1/32 ply mount using 5 stacks to give it strength. Epoxy was used to hold motor in the mount.

I have began covering the tail feathers, silver tissue. The body will be 2 tone silver / blue.

The wings are drying at this moment and I didn't want to disturb them so they are not pictured. They are covered in blue tissue.

About the electronics, the Blue Arrow is designed to be used as a 1 cell ESC. I am under the impression I will be to heavy to fly this rig with such a low voltage battery. I tried to use a 2 cell and I just get beep errors.

At this point before I cover the fuse, I guess I will either A, go to the LHS and see if they have any small ESC for 2s. Or B, wait for my 1gram ESC to come from Hobbyking. Shedding the extra 4 grams might be enough to get this puppy air born with a 1S.

I now realize the mistake I made purchasing the blue arrow. I regret the decision because I did purchase 2 of them not realizing the handicap it would stalemate me with.
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Old 11-20-2011, 09:54 PM
  #13  
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Originally Posted by Bill G View Post
Going bl is probably a good idea. Building these things brushed is difficult, as the weight adds up quickly. You can always get creative with lightweight linkage, and have ailerons for little weight penalty. I built the Stuka with a .015" music wire setup for the ailerons, driven from a bellcrank that also drives the rudder, and therefore have both coupled together. One of the best flying small planes I've ever built. The flat wing would be a good bit easier for routing the wire, than the gull wing was. The tailwheel steers from an aluminum crimp as a takeoff from the rudder pushrod, barely visible without a microscope.

Incredible management of the systems within your plane!

Impressive.

I am only going Rudder / H Stab.

I won't even be using landing gear because I was intending on getting this thing airborne with only a 1 cell supply.
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Old 11-21-2011, 12:38 AM
  #14  
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Skin is on.

I left the Blue Arrow inside.

Just need to put a layer of dope to get it strong

The water spots are from tightening the tissue. It is a little sloppy on the wings because of skipping strips and me just failing I suppose.

The motor / power is rated at 39g of thrust.

So far the model is coming in at 40g's.

I think she might fly.. Not well, and at full throttle with no wind. But I think she might just do it. We will see.. If not- oh well. Lesson learned.

This is my first attempt at such a small RC plane. Enjoy the pics. More to come as it dry's and I get the dope and canopy on.
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Old 11-21-2011, 02:34 AM
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Wow! that was fast.

Now I'm looking forward to the maiden. Any idea when that might be?
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Old 11-21-2011, 05:46 AM
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Default Build Finished.

Alright,

42g AUW

That includes the prop and prop saver + 1s 160mah lipo.

Her flight will hopefully take place soon. We will see!


I guess the question is, what should I build next?
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Old 11-21-2011, 07:54 AM
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Looks good. Tissue is not easy either. I'm too lazy to use it, and use Coverite Microlite.
I have a little Dumas Peashooter that flies on rud/elev, but it doesn't lend itself to being the easiest conversion. It is a good one for you, with rud/elev though.

As for the 1-cell issue, there is a chance that a standard 1N4001 diode may drop supply voltage enough for a 2-cell to work, as it drops it by .6V. I used the trick on a Guillows Rumpler for use of a 2s lipo with Castle T-bird6, with the old 1-cell AR6400 Spektrum board. The diode was used to drop the supply voltage to the Spektrum board, while still using the 2s lipo to power the ESC.
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Old 11-22-2011, 03:19 AM
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Default Covering

Yeah, I love the look of synthetic covers. The clean smooth finish they get. However I cant break the habit of using tissue. I suppose I should stop being cheap and make the switch, but for some reason I just cant do it. I know ultracote / monokote are typically stronger then tissue, but I just love how tissue has the rustic look.

You did an excellent covering job on those birds!
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Old 11-23-2011, 05:42 AM
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Default Maiden

Well, It has been pretty windy here. 8-16 mph. So no maiden flight as of yet.

Hopefully sunday or monday next week will be good!

Until then, I started working on a Guillow's Chipmunk. I am trying to keep it under 35 grams. We will see how that works out.
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