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Hot Topic (More than 10 Replies) Jetco Dayton-Wright RB1 Peanut - Brown Campus A23 (Read 5338 times)
Craig 3
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Re: Jetco Dayton-Wright RB1 Peanut - Brown Campus A23
Reply #15 - Oct 16th, 2017 at 7:47pm
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Two weeks of standing by the mailbox finally paid off and my box from the Czech Republic showed up! It's a tad longer than the Brown, and a couple grams heavier but it should be more powerful and efficient by a good margin. I hope to be back to building soon- life gets in the way sometimes...
  

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LASTWOODSMAN
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Re: Jetco Dayton-Wright RB1 Peanut - Brown Campus A23
Reply #14 - Sep 30th, 2017 at 9:31pm
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Wow Craig - love the sound that little motor makes!  Cool
LWM
  

OH, I HAVE SLIPPED THE SURLY BONDS OF EARTH ... UP, UP THE LONG DELIRIOUS BURNING BLUE ... SUNWARD I'VE CLIMBED AND JOINED THE TUMBLING MIRTH OF SUN-SPLIT CLOUDS ...
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Craig 3
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Re: Jetco Dayton-Wright RB1 Peanut - Brown Campus A23
Reply #13 - Sep 30th, 2017 at 8:08pm
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Here's a link to a (short) run of a G-24. With a full liquid charge and a proper RPM setting with this prop and a sub-25g model, a two-minute run is about right. Long enough to need a DT!

https://www.youtube.com/watch?v=B0fh6apMyqA
  
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Craig 3
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Re: Jetco Dayton-Wright RB1 Peanut - Brown Campus A23
Reply #12 - Sep 30th, 2017 at 7:52pm
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The build is ongoing, but stalled. I have two of these little Browns- one requires a nearly impossible to find 1mm charger, the other is a later one with the easier-to-source 2mm charger. The later engine has a duff check valve in the filler nipple, and both have perished "head gaskets" behind the flare on the inlet pipe. I've opted to go with a Gasparin G24 9 ( http://www.old-engine-model.com/en/707.g-24/ )- similar size, more efficient, and better parts support. A little spendy, but I love these little Czech machines and it will outlast the airframe. I'm watching the mailbox...
In other news, I'm going to build it again, maybe soon while the mistakes are fresh in my mind, as a rubber FF build. Lots of places to trim some weight...
  
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LASTWOODSMAN
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Re: Jetco Dayton-Wright RB1 Peanut - Brown Campus A23
Reply #11 - Sep 24th, 2017 at 8:14pm
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Craig - the last time I saw some good stainless tubing and little vessels, work like that, was in grade 7 Science Project class, where we all had to build something.   In walks this kid, Ralph Michaelis, with a brilliant primitive tiny working steam engine locomotive all soldered and welded with tubing and boilers and silver and bronze.   The teacher, a big 6'4" red-haired man named Mr. Boughner, tells us all that Ralph's Dad made it for him.  Then, Mr. Boughner grabs my big, "double A frame", wooden counterweight Trebuchet catapult.  It had a slingshot pouch and a long swinging arm with a lot of counterweight lead on the short end, made from depleting my Dad's supply of lead wheel balance counterweights for car wheels at his garage, and melting them all down into two forms.  Then, to my surprise, Mr. Boughner turns into a gleeful child with a toy,  and proceeds to launch a handful of giant beauty boulder marbles, one after the other, right over all of the kid's heads from the front of the class, and flying very very fast into the ceiling and walls and ricocheting everywhere as the kids sat there dumbfounded like paralyzed sitting ducks.  And these boulders flew almost as fast as you could throw them !!  Strange things happened in schools in the olden days ...
Craig - don't tell me you made a still for science class ...  Roll Eyes
  

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OH, I HAVE SLIPPED THE SURLY BONDS OF EARTH ... UP, UP THE LONG DELIRIOUS BURNING BLUE ... SUNWARD I'VE CLIMBED AND JOINED THE TUMBLING MIRTH OF SUN-SPLIT CLOUDS ...
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LASTWOODSMAN
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Re: Jetco Dayton-Wright RB1 Peanut - Brown Campus A23
Reply #10 - Sep 24th, 2017 at 4:18pm
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So THAT'S where you stole that little stainless steel tank and tubing from!
LWM
  

OH, I HAVE SLIPPED THE SURLY BONDS OF EARTH ... UP, UP THE LONG DELIRIOUS BURNING BLUE ... SUNWARD I'VE CLIMBED AND JOINED THE TUMBLING MIRTH OF SUN-SPLIT CLOUDS ...
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Craig 3
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Re: Jetco Dayton-Wright RB1 Peanut - Brown Campus A23
Reply #9 - Sep 24th, 2017 at 3:53pm
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Jeez, LWM, I'm disappointed! I thought you, of all people, would comment on my mad hillbilly skills of building a moonshine still into a peanut-scale aeroplane!
  
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LASTWOODSMAN
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Re: Jetco Dayton-Wright RB1 Peanut - Brown Campus A23
Reply #8 - Sep 24th, 2017 at 3:34pm
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Hey Craig - very interesting plane. Smiley I just read up on it.  This quote, from RC Groups,  "Seriously refreshing to see some genuine skills and a stick/former balsa model., in this age of crappy ARF's and cartoon foam efforts." Wink
LWM
  

OH, I HAVE SLIPPED THE SURLY BONDS OF EARTH ... UP, UP THE LONG DELIRIOUS BURNING BLUE ... SUNWARD I'VE CLIMBED AND JOINED THE TUMBLING MIRTH OF SUN-SPLIT CLOUDS ...
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Craig 3
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Re: Jetco Dayton-Wright RB1 Peanut - Brown Campus A23
Reply #7 - Sep 24th, 2017 at 3:28pm
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The screaming Brown Campus A-23!
  

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Craig 3
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Re: Jetco Dayton-Wright RB1 Peanut - Brown Campus A23
Reply #6 - Sep 24th, 2017 at 3:23pm
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A couple more notes- The printwood for this kit is very light 3/64" inch stuff. I'd like to build it again, with 1/32" X 1'16" stringers, a good carved balsa prop, and light balsa dummy wheels in the holes. With a 12" loop of 3/16 rubber I'll bet it would be a superlative little flier!
All the patterns can be gleaned straight from the plans, with the exception of the wing ribs, which would have to be adjusted for taper from the "root" ribs indicated.
The plastic wheels and nose bowl, while not Guillows heavy, could be easily improved upon with light balsa.
I wanted to experiment with silver tissue before I got to covering the Supermarine S6B, so here's my chance!

A fun build!
  
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Craig 3
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Re: Jetco Dayton-Wright RB1 Peanut - Brown Campus A23
Reply #5 - Sep 24th, 2017 at 3:14pm
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At any rate, a couple evenings and most of the weekend has it ready to cover. The plans include a rather ingenious retracting gear, but as it only has about 32 square inches of wing, I decided to forego the weight. I imagine I'll install a couple unobtrusive "whiskers" to save on prop strikes. All up, as pictured, it weighs 18.1g. The complete Brown motor, with tank, plumbing, and prop, weighed in at 7.2g., about a gram more than the kit rubber, nose button, prop, and rear peg. The diminutive size is apparent when you see it hides behind that 7/32" nose bowl!
The "gas tank" is located on cg, so consuming the approx 3g load of CO2 shouldn't affect trim.
Right now, it balances just a TRIFLE nose heavy on indicated cg, about what cover and the cockpit windows should offset.
Hopefully, since the wing is in the "low speed/ takeoff" camber configuration, it'll be light enough to fly!
  

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Craig 3
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Re: Jetco Dayton-Wright RB1 Peanut - Brown Campus A23
Reply #4 - Sep 24th, 2017 at 2:55pm
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Some down-and-dirty jigging was naturally involved...
  

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Craig 3
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Re: Jetco Dayton-Wright RB1 Peanut - Brown Campus A23
Reply #3 - Sep 24th, 2017 at 2:53pm
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One interesting feature is the way the HS attaches to the duck tailed rear fuse. The leading edge is attached on a step, leaving the TE free to be shimmed up from the rather severe incidence at full droop. It should make it easy to trim!
  

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Craig 3
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Re: Jetco Dayton-Wright RB1 Peanut - Brown Campus A23
Reply #2 - Sep 24th, 2017 at 2:50pm
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Like this...
  

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Craig 3
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Re: Jetco Dayton-Wright RB1 Peanut - Brown Campus A23
Reply #1 - Sep 24th, 2017 at 2:46pm
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This is an interesting kit and a fun build. Jetco went about things a little differently. The fuselage is built top-half first with split formers. Then, it's flipped and the bottom formers are added. It's designed with 2 degrees down thrust built in. The formers are, with two exception, free of stringer notches and rather have a polygonal shape with the stringers glued over the points. It was a little different to work with, but actually made it easy to get the stringers run fair. It did, as you can imagine, make me wish I hadn't sworn off CA!
  
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