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A quick project to knock out. Empty A quick project to knock out.

Post  batjac on Sat Apr 18, 2020 8:10 pm

There’re a couple of projects that I’ve been wanting to do for a few years, but just never made time.  I can’t claim credit for the original idea.  I saw a sketch a few years ago on the idea and it stuck with me.  I don’t remember where, but I saw the sketch of an F8F Bearcat and a Zero both using a Baby Ringmaster wing.  Seemed a good idea, but neither plane looked quite right with the BRM wing.  The wing shape just didn’t match the planes.  But the more I looked at the BRM wing, the more I realized that its shape did work for an F4F Wildcat.  It wouldn’t be too much effort to do, but I just wasn’t in the mood to build a couple of BRM wings.  I know I could order a BRM kit from PDK or Brodak, but it seemed like too much money for just the wing.  Not saying the kits are not worth the money, just not what I want to invest in this idea.   So I put the project on the back burner until my plate cleared (yeah, right!) and I had time to scratch out a couple of BRM wings.

Back at the end of February, Doug Hart (WillyNillies) posted about their new BRM kit.  At $24.95, it was closer to being worth shelling out some dough, but not quite.  I asked Doug what it would cost for just the wing kit, and he eventually got back to me with a price of $16.95 for just the wing kit and hardware.  That was the sweet spot.  So, I ordered two wing kits and one BRM kit.  You can never have enough Baby Ringmasters.  Being the patriotic guy he is, Doug also gives a discount to active duty military and vets.  So that was another 5% off the total, before shipping.

The wing kits came a couple of weeks ago, but as usual, I was in the middle of a couple of other projects I needed to finish.  After pretty much getting done with the Snip, I cleared some space on the build table.  I really shouldn’t be starting a new project, but what the hell.  Looking through what came, I have everything but the leadout materials.  They got left out somehow.  No biggie, I have materials to make up a couple of leadouts, and it’s not worth calling them over.  The 5% discount more than makes up for the cost of the leadout wire and crimps.  The wing is laser cut, and well thought out.  It slides together in a few minutes and you just put a drop of CA, or whatever your preferred glue is, on the joints.  The wing builds in no time.  It’s not the standard BRM wing, so don’t expect it to be exactly like what you’d get from PDK, Brodak, Sterling, Estes, whoever.  But it’s a good wing.  Here it is built, but with only the top sheeting left to install:

A quick project to knock out. DSCN7017



I’ll close this out once I make a fuselage and know how long to make the elevator pushrod.  As you can see, the leading edge is a flat piece of 9/16”x1/8” balsa, as is the t.e, rather than a stick of square or rounded l.e. stock.  So what you get is a little different from your standard BRM wing.  But it’ll fly well.  I used thick CA to tack the ribs, as that’s what I had on hand without opening a new bottle of CA.  Next wing I’ll do everything I can with thin CA.

All the wing pieces, except the top sheeting and shear webs, are laser cut from one stick of 1/8”x3” balsa, so I’m not sure why he programmed the l.e. for 9/16” width.  Maybe to give the ribs plenty of mating surface.  He also cuts the wing ribs from the same 1/8” stock, so the ribs are very stout.  WillyNillies produces 13 plane kits, but only one of them is a CL plane, so I’m assuming Doug is mostly an RC guy and has little CL experience.  That’s probably why he designed this kit so stout.  Or maybe it just makes more economical sense for him to use the wood the way he does.  I’ll not second-guess him for making a good kit at a good price.

More to come…

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Post  batjac on Thu Apr 23, 2020 4:04 am

A little more time into this.  I cut the fuselage and drew my reference line.

A quick project to knock out. DSCN7021


Then I traced the cutout of the #1 rib and added around it to account for the rib sheeting.

A quick project to knock out. DSCN7023


Then I cut out the fuselage for the wing, and cut my tail surfaces.

A quick project to knock out. DSCN7030


My further plan of attack is to:
1) Make the wire joiner for the elevators and install it.
2) Hinge the stab/elevator with a MonoKote hinge.
3) Drill the elevator for the 1/2A control horn.
4) Pin the stab in place and figure out the pushrod length, then cut to size.
5) Finish cutting the elevators into two halves. I left the center balsa in place so it’d be easier to work with for the above 4 steps.
6) Install the pushrod and glue on the remaining center sheeting.
7) Cut the fuse for the engine bearers.
8 ) Temporarily mount the wing and then drill the engine bearers for the Medallion .049 I plan to use, using my homemade incidence tools to make sure the engine thrust line is 0° to the wing.
9) Bend up the landing gear and drill the mounting holes in the fuse.
10) Cut out and glue on the doublers.
11) Cover the wings and fuse.
12) Make up the roundels for the wings and fuselage, and the stripes for the fin.
13) Glue it all together.
14) Take a bunch of pictures.
15) Put it away on a shelf because I’m too chicken to fly it and possibly crash it.

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Post  batjac on Sun Apr 26, 2020 1:11 am

Well, I was bad and didn’t take photos as I went, but I made the elevator joiner and then fabricated the stab and elevator.  I covered them and then pinned them in place to get the measurement for the elevator pushrod.  I cut the pushrod, and then installed the last center sheet piece.  

Then I installed the engine bearers and glued on the 1/32 ply doublers.  With the major construction finished, I then moved to the engine mounting.  I used my homemade jig to verify I was drilling the mounting holes properly.  I did remember to take a photo.  As you can see, the jig is way too huge for this model.  I just have to make a 1/2A sized jig.

A quick project to knock out. DSCN7036



With the holes drilled and the blind nuts installed and glued, I added a 3/32” tripler on the inboard side and sanded everything to shape.  Then I covered the fuselage with white MonoKote and blue EconoKote.  I have work tomorrow morning, so I had to stop for the night.  Not my neatest covering job, but okay for the task.  Here’s where she sits:

A quick project to knock out. DSCN7037
A quick project to knock out. DSCN7042
A quick project to knock out. DSCN7041
A quick project to knock out. DSCN7043



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Post  MauricioB on Sun Apr 26, 2020 2:12 am

Hello batjac, I am seeing your work, I like to read the description of what you received. I am surprised that the ribs of that wing are 3 mm thick, generally with a 1.5 to 2 mm maximum is more than enough, as you say, perhaps they want a very robust model from the manufacturer.
I also see that you have a wing incidence meter placed there, you have made it yourself ... I found a very good job done on that tool as well!
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Post  dirk gently on Mon Apr 27, 2020 1:13 am

Simply gorgeous. Makes me want to try out CL flying.

What thickness balsa did you use for the fuselage?
Is the engine a 049TD?
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Post  NEW222 on Mon Apr 27, 2020 10:32 am

Great job. I really like how well your covering came out. Nice, sharp, and clean. Can't wait to see what's next.
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Post  batjac on Thu Apr 30, 2020 6:18 pm

When I got home last night I decided to knock out the roundels.  It took a lot longer than I thought, using just an X-Acto knife, compass, and pair of scissors.  

A quick project to knock out. DSCN7049
A quick project to knock out. DSCN7051
A quick project to knock out. DSCN7063
A quick project to knock out. DSCN7068
A quick project to knock out. DSCN7075
A quick project to knock out. DSCN7077
A quick project to knock out. DSCN7083
A quick project to knock out. DSCN7088



They don’t look too bad for cutting these out free-hand.

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Post  OhBee on Thu Apr 30, 2020 10:19 pm

Nice work! I like it!
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Post  akjgardner on Thu Apr 30, 2020 10:24 pm

Yes. nice work
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Post  batjac on Sun May 03, 2020 4:36 am

Almost there.  Just three or four more little things and then it’ll be ready to glue everything together.  The canopy didn’t quite come out as it looked in my mind, but it’s okay.  I only had to re-do it two times.  The rudder came out good, I think.  Working with four different types of covering is something of a pain, though.  When putting the number on the sides, I found that the blue Monokote of the roundels had shrunk slightly.  I’ve never seen that happen before.  I debated for a long while about whether to put the cowling lines on it, but I went ahead and did it.  I kinda wish that my panel line pen was more of a grey than such a dark black.  The lines stand out a little too much for me.  I did the ailerons with the panel line pen but since the ailerons on the Wildcat were so surprisingly small it just didn’t look right.  So I used some Monokote Trim Solvent and removed the lines.  Ah, well.

A quick project to knock out. DSCN7093
A quick project to knock out. DSCN7091



More when I finish it off in the next couple of days.

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Post  batjac on Sun May 03, 2020 5:03 am

dirk gently wrote:Simply gorgeous. Makes me want to try out CL flying.

What thickness balsa did you use for the fuselage?
Is the engine a 049TD?

Sorry, Dirk.  I meant to answer this earlier.  The fuselage thickness is 1/4" Medium balsa.  The engine is going to be a Medallion .049 on this.  The Medallion should be  enough to do this plane right.

And you should definitely try out CL flying.  I started out as a kid with CL, but in 1978 I graduated to flying R/C.  I did R/C exclusively until 2013, when one of the members from this forum let me fly his .049 WingMaster and his Junior Ringmaster at a local 4th of July fly-in.  I've been doing CL ever since.  My R/C stuff is getting sold off or given away.

Funny, I clearly remember flying Duke's WingMaster, but I have absolutely no recollection of flying his Junior Ringmaster.  I guess anything larger than .049 is just useless information to be forgotten as soon as possible.

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Post  Cribbs74 on Sun May 03, 2020 8:52 am

Looks good Mark. I like it, well done.
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Post  GallopingGhostler on Sun May 03, 2020 9:14 am

Nice job, Mark, immediately caught my attention, another trip down memory lane. Back in high school 1972, I made a 20 inch profile F4F with 1/8th inch sheet wing, which incidentally was doped the same medium blue colour as yours. I mounted a Cox 290 postage stamp engine and separate tank, made sheet engine mounts from the sheet metal frame of a Polaroid instant film flat pack canister.
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Post  getback on Sun May 03, 2020 9:26 am

Looks pretty darn good to me , i bet she will fly well also , Good Fun Mark sunny
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Post  akjgardner on Sun May 03, 2020 9:30 am

Looks good, Prompted me to by 3 BRM from willieNillie, s You need to get your sales commission Very Happy
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Post  batjac on Sun May 03, 2020 8:27 pm

akjgardner wrote:Looks good, Prompted me to by 3 BRM from willieNillie, s You need to get your sales commission Very Happy

I was just looking over on RCG, and Doug says they got over 500 orders in April alone! Gonna be interesting to see how all the lockdowns work out for small garage businesses like WillyNillies at the end of all this.

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Post  dirk gently on Mon May 04, 2020 2:55 am

Great,
one last question - what's the wingspan?
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Post  getback on Mon May 04, 2020 6:36 am

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Post  rsv1cox on Mon May 04, 2020 6:52 am

Nice job Mark. From April 18th until today. Quick project indeed, takes me that long to think about it.

You are the Mono/Econokote King. Beautiful job on the custom roundels.

Bob
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Post  batjac on Wed May 06, 2020 3:52 am

Pretty much finished with this one.  ‘Bout the only thing left is to put on the right prop and other wheel collars.  I ran out of 1/16” wheel collars, and as far as I can find, the old Goldberg spring collars for 3/64” wire are unobtanium.  I think a Master Airscrew 5x3 three blade prop will look better on this so I ordered a couple.  Hopefully the wheel collars and props will be here by the weekend.  I also need to put some kind of padding under the tank to keep in from marring the EconoKote and to keep it from moving.

I like how this came out, but it’s a porker.  7.8 ounces ready to fly.  The balance point is right at 25%, which is slightly aft of where I like it.  I prefer 15%-20%, but oh well.  Hang test came out fine, though.

A quick project to knock out. DSCN7120


Almost ready to fly:

A quick project to knock out. DSCN7121
A quick project to knock out. DSCN7127
A quick project to knock out. DSCN7132
A quick project to knock out. DSCN7135
A quick project to knock out. DSCN7150


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Post  dirk gently on Wed May 06, 2020 7:25 am

Looking great,
hope you weren't serious about not flying it.
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Post  batjac on Thu May 07, 2020 3:57 pm

dirk gently wrote:Looking great,
hope you weren't serious about not flying it.

Not really. I'll fly it when we get out of this shelter in place B.S.

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