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DPCM repro Guillows DH-4

Old 02-12-2017, 11:34 PM
  #1  
Griff Murphey
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Default DPCM repro Guillows DH-4

Hello all, Dave has released his laser cut 27" span repro of the original. He offers it in original and in lightweight. I have mine all framed up and almost ready to cover. Dave left out one frame part from the rudder but this was easily replaced. There are some minor discrepancies in the fit of the struts but I believe this is just the way Guillow made it. I used the Spektrum 7.4 V brick and an outrunner 180. Battery will load from the underside with a magnet retained access hatch. Upper cowl, which I separated and covered in 1/32 sheet balsa, is also to be magnet retained to allow full access to the engine compartment. Comes in handy after faceplants and if you have to adjust the thrust angles.

As always Dave replaces the vacuform parts with balsa, this is a survivability plus particularly re the cowl.
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Old 02-21-2017, 04:48 AM
  #2  
Griff Murphey
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So I am looking at the wings and the seem a little fragile. I am wondering if I need to add a hardwood 1/16" top spar? These wings flex a lot. Dave calls this the lightweight - uses 1/16" x 3/16" instead of 1/8" x 3/16" spars. There are two soars for the upper wing but only one fir the lower. My experience with biplanes is that the lower wing is the one that gets whanged the hardest and most often. Your opinions?

Top photo - lower wing on the left
Bottom photo is the lower wing.
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Old 04-17-2017, 04:56 AM
  #3  
Griff Murphey
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Default Almost ready to put wings, struts, and undercart on

Making up some details like vac form Easy Bilt pilots and guns, the US ones used a weird Marlin MG. It's a pure flying model I am not going nuts on details - I may even leave off the aft twin Lewis guns.

May cut the pilot and gunner down get the heads lower.

Can you suggest a paint that might stick to an orange plastic GWS EP Orange plastic prop? Maybe Testors enamel thinned with lacquer thinner.. or rustoleum out of a can?
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Old 04-17-2017, 09:11 PM
  #4  
JetPlaneFlyer
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Nice work there Griff!

Any paint with lacquer thinners should probably be avoided on plastic parts, but maybe if you put it on in light coats it would be ok, it might 'self etch' to the surface!
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Old 04-18-2017, 01:33 AM
  #5  
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Thanks... I want to get a "wooden" appearance... Def. not an orange plastic look!
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Old 05-19-2017, 05:04 PM
  #6  
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Default Nearing Completion

Just about to put her together. Purists will note I did not do all the small stuff I could have to make it a more accurate US type "Liberty Plane." I used the Easy Bilt vacuform pilots, did the fleece collars with white glue sprinkled with balsa sawdust. The Lewis guns are the nice laser cut wooden receivers with plastic tubing for barrel and gas tube. No ring mount just a little bar with a couple of spikes in it to hold the guns. I can pinch the wire to remove before flight if I wish.
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Old 05-19-2017, 07:00 PM
  #7  
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Pilot and Lewis guns
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Old 05-30-2017, 09:33 PM
  #8  
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Default DH 4 about ready to fly

There are a few more things I want to do on it but if I screwed on a prop and screwed up my courage, I could fly it now...

Sorry about the model rr temporarily doubling as a factory floor.
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Old 06-14-2017, 02:46 AM
  #9  
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Thought you might like to see how I bungee my WW-1 planes' spreader bars.
You may also take note of the Moses magnet retained battery hatch. Wheels are from Williams Brothers... technically they are post WW-1 golden age but they look ok to me.
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Old 06-21-2017, 04:09 AM
  #10  
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Here is the finished airplane. Father's Day the wind was gusting 10-15 mph, I have had my eye on a vacant lot with lots of nice weeds and I did a couple of short, low altitude flights of about 50 yards, enough to establish that it will fly. This is not the black 6 that found the Lost Battalion (as depicted in a famous painting of French troops trying to assist its dying aircrew) but it is from the same 50th Aero Squadron.
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Old 06-25-2017, 03:04 PM
  #11  
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Default Rough start

Took off into a 3-5 mph headwind and the plane curved to the right and looped in. The first time I chopped power and got away with it. The second time I tried to fly out of it....the right lower wing got torn away at the dihedral glue joints. Fairly easy repair. I think I might try a smaller prop, I was trying to use a scale proportion one. I have a curvy WW-1 style I might try. But it could be it's just too much torque.
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Old 06-25-2017, 05:42 PM
  #12  
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Go easy on the throttle

I had to learn that the hard way.
Sometimes if I cut throttle, which gets rid of torque, I could glide out of trouble.

Beautiful plane
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Old 06-25-2017, 10:03 PM
  #13  
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I am actually thinking of fitting a smaller size prop. My 24" span Repro Guillow Storch flies well with the next size down prop. The DH is bigger at 27" and has a lot more drag but I think I might try that smaller one. I tried to find one that I thought was scale size and it's pretty long. It may have 3/8" of ground clearance... Might pay me to do that
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Old 07-08-2017, 03:20 PM
  #14  
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Had a couple of test flights yesterday with 100 grains of nose weight, flew a bit, still stalling and had a hard landing. Apparently that ruined the Outrunner 180 so chalk up a $30 engine change. Knocked on undercart leg loose and a slight tear on underside tissue. I have added a further 50 grains of nose weight hopefully that will fix it.
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Old 07-15-2017, 05:50 PM
  #15  
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Default Yippee finally a NICE flight!

Added a third 55 gr. .223 FMJ to the nose and in the engine change I lessened my down and right thrust. The plane flew very well nice and stable, landed gracefully. It was almost 100 feet up before I realized it was going well!

Horizon is treating me well on my destroyed Outrunner 180 and are sending me a new one gratis!
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Old 07-18-2017, 05:38 AM
  #16  
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Originally Posted by Griff Murphey View Post
Added a third 55 gr. .223 FMJ to the nose and in the engine change I lessened my down and right thrust. The plane flew very well nice and stable, landed gracefully. It was almost 100 feet up before I realized it was going well!

Horizon is treating me well on my destroyed Outrunner 180 and are sending me a new one gratis!
That is great news! Great looking model too.
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Old 07-18-2017, 05:54 AM
  #17  
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Thanks!! I was kinda worried I would not get it flying! It's real pretty in that doped linen/OD. scheme in the early morning sun.
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Old 07-18-2017, 06:15 AM
  #18  
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Originally Posted by Griff Murphey View Post
Thanks!! I was kinda worried I would not get it flying! It's real pretty in that doped linen/OD. scheme in the early morning sun.
LOL, kind of a rough start but congrats on getting the tweaks right!
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Old 03-25-2018, 05:33 PM
  #19  
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It looks fantastic. I'm glad you worked out the flying issues in the end.
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Old 03-25-2018, 11:52 PM
  #20  
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Beautiful looking plane!
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