RE: Catalina PBY2 - Budd Chappell   
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RE: Catalina PBY2 - Budd Chappell - 1/9/2009 4:23 AM   
Mustang Fever



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From: Cadillac, MI, USA
Status: offline 		Not a lot of progress today. Managed to get the TE fitted. Lots of 1/16" slots cut in it for the ribs. I'll glue it on tomorrow, then fit the LE sheeting. Then I can start on the outboard panels.

I've decided not to use my Astro 020s on this bird. I'm going to build a Shrike, about 250 square inch wing, from plans that another RCUer is putting together for the speed fanatics. I'll probably build it before finishing the PBY, but the PBY construction will not stop.

I'm looking at using a pair of Axi 2814/20 outrunners on the PBY. This will allow use of 9x7 3 blade Master Airscrew props. The performance will be more or less identical to the Astros, but the "scale" factor of the larger, three blade props will be much nicer.

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RE: Catalina PBY2 - Budd Chappell - 1/9/2009 4:33 PM   
Mustang Fever



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Status: offline 		Here we go. Center section completed, before sanding. I put a bottom shot in here so some of what I said about how it goes together makes a little more sense.

The best part of the new motor selection is that I already had on hand two of the 9x7 3 blade MA props. One normal and one pusher, so I can still have counter-rotating motors, with the "strong" blade on the inboard side.

There are some real advantages to electric. Don't care for the prices, much, but it's worth it in the long run for certain types of aircraft.

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RE: Catalina PBY2 - Budd Chappell - 2/2/2009 3:00 AM   
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Status: offline 		We were helping the daughter & family move for a week, then had almost a week of computer problems, plus being sick with a cold, so no progress until the last couple days.

Got the wing all put together and rough sanded. By lining up the trailing edges, and weighting the leading edge down as far as it would go during gluing, I got about a degree and a half of washout on each outer panel.

Made some progress on completing the nacelles. Decided to strip plank them with 1/16" balsa. Also drilled some holes through the front of the "fake" engine for cooling airflow around the motors.

The rest of the hardware, minus the battery, is one the way so I'm going to completely finish the wing and locate all the servos, retracts, motors, etc. Before going on to the pylon.

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RE: Catalina PBY2 - Budd Chappell - 2/2/2009 7:10 PM   
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Status: offline 		Epoxied the left nacelle to the wing today, after installing the motor and pulling the wiring and ESC through to near the centerline. The 1/16 strip planking is working out really nicely. I'll be using an outline piece on top of the wing that will help with strip planking the upper nacelle, and used fill in sheets of 1/16 here and there to insure good transition of the covering from nacelle to wing.

Not very good pics. The old camera is dying, I think.

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RE: Catalina PBY2 - Budd Chappell - 2/4/2009 12:53 AM   
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Status: offline 		The first pic shows the process I used to get a good 1/16 filler piece on the nacelle between the bottom and the top, where it has to fit the airfoil curvature. I used the pattern directly from the plans, and it fit the curve perfectly, another tribute to Bud's drawings.

I made the transition parts in two pieces each- the forward part with the grain running horizontally so that it would bend around the firewall easily, and the aft part with the grain running vertically so that it would easily conform to the shape of the outline piece as it narrows at the aft end.



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RE: Catalina PBY2 - Budd Chappell - 2/4/2009 9:02 AM   
siddus74



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Status: offline 		Bob,

Neat job on the strip work, interesting way to get over the profiling issue for the wing section & LE shape etc, I like the way you were not left with the having to produce a small block section for the back of the assy, thats the way I end having to do it as I can never manage a neat job when the 1/6th has to curve to ways.

Scott.


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RE: Catalina PBY2 - Budd Chappell - 2/4/2009 2:16 PM   
Mustang Fever



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Status: offline 		Yeah, doing that part with the grain running in two directions made it easy. The rest of the planking, tho, is really tedious. The bottom wasn't so bad, but the top, being bigger, requires a lot of gap filling pieces as the balsa doesn't want to conform to the shape. I'll try to get a pic that shows that once it's all done.


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RE: Catalina PBY2 - Budd Chappell - 2/4/2009 8:11 PM   
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Status: offline 		This is why I stick with building. The satisfaction of having a part that looks right after a lot of messing about. The ARFers don't know what they're missing.

I'm going to get a new camera, next thing.

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RE: Catalina PBY2 - Budd Chappell - 2/5/2009 5:14 PM   
siddus74



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Status: offline 		Bob,

I know . . . they are missing out, althought the balsa dust can give you a nasty cough!

Good work.

Scott.


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RE: Catalina PBY2 - Budd Chappell - 2/6/2009 3:33 PM   
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Status: offline 		Thanks, Scott. I need all the encouragement I can get right now. I'm immersed in the "strip planking blues". I got so tired of working on the other nacelle, that when the rest of the hardware arrived from Tower, I immediately started working out the tip retract installation.

I had to chop out the center of another rib and make a longer ply mounting plate so that everything would fit in the correct position. (The tip float retract mechanism had to sit somewhat outboard of where I had envisioned so as to obtain the correct strut length.) It actually works There's enough travel and torque from that little micro to operate it. Won't know fully how it does until everything is bolted down, but it's looking possible.

The only bug is that at 1/2 servo travel, it appears as if the tip of the horn is going to kiss the bottom of the upper covering. Any ideas? I was thinking of making a NACA cuff that would add height to the LE sheeting. Ivan uses them on his designs, but I'm not sure what his look like. The ones on my Nexstar trainer basically add a little thickness to the top and bottom of the LE, and extend the airfoil forward a bit.

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RE: Catalina PBY2 - Budd Chappell - 2/10/2009 9:34 PM   
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Status: offline 		Twins.

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RE: Catalina PBY2 - Budd Chappell - 2/12/2009 4:32 PM   
Mustang Fever



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Status: offline 		I almost can't believe it. This airplane isn't really big enough for a scale feature like retractable tip floats, but here they are. Next comes the aileron servo installation just inboard of the retract mechanism. It only took three days to think through this one.

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RE: Catalina PBY2 - Budd Chappell - 2/12/2009 10:03 PM   
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Status: offline 		Brilliant! Simple and worth the 3 days of thought.

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RE: Catalina PBY2 - Budd Chappell - 2/13/2009 8:38 AM   
siddus74



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Status: offline 		Good work, how did you get around the problem of the servo horns potentially touching the covering film? If I recall the tip of the wings are quite shallow . . . Just an observation my ailerons are the full length of the outboard sections . . .


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RE: Catalina PBY2 - Budd Chappell - 2/13/2009 1:02 PM   
Mustang Fever



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Status: offline 		Scott:

You're correct- this is definitely 5 pounds of stuff trying to fit in a 3 pound bag

Both the tip of the servo horn and the retract mechanism (when retracted) are above the sheeting line. I think I'm going to "cuff" the entire tip outboard of the retract mechanism so as to hide everything. Shouldn't be very much work, and won't add much weight. Properly done, cuffs reduce or eliminate tip stalls, which are a concern on a high aspect ratio wing like this one. Do you have you're Martin Mars plans, yet? I think Ivan says cuffs are part of almost all his designs. I like to see how he does it, if you can get a shot of one from the plans.

Here's a shot of the cuff on my trainer. I'll try to duplicate this approach, but bring it a bit more aft on top so as to cover the retract area.



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RE: Catalina PBY2 - Budd Chappell - 2/13/2009 2:08 PM   
siddus74



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Status: offline 		Bob,

I see . . . would this not give you more depth on the bottom and not the top where you need it? I have the mars plans now . . . I will endeavor to get them out and take a picture across the weekend . . .


Scott.


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RE: Catalina PBY2 - Budd Chappell - 2/13/2009 3:37 PM   
Mustang Fever



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Status: offline 		I think you might be right on that. Maybe I'll just put a "blister" over each area where there is a protrusion.


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RE: Catalina PBY2 - Budd Chappell - 2/13/2009 4:41 PM   
siddus74



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Status: offline 		Bob,

Just thinking about your cuffs etc . . Im wondering if that may help me out with the sunderland wing loading? Maybe to awkward what with the rounded tips etc . . .


Scott.


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RE: Catalina PBY2 - Budd Chappell - 2/13/2009 5:59 PM   
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Status: offline 		Scott:

The cuffs can go inboard of the rounded part of the tips. I'll bet that's what Ivan does.


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RE: Catalina PBY2 - Budd Chappell - 2/19/2009 2:10 PM   
Mustang Fever



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Status: offline 		Taking a breather here. In the process of working on the right hand float retract installation, I realized I'd fallen into the old "reverse servo" trap. Both retract servos face aft, which means one of them has to rotate the other way for everything to work correctly. (Unless I can live with one float up and one down )

So, I ordered the Futaba equivalent of the HitTec micro. So far, all Futaba servos I've used have been opposite rotation to their HiTec counterpart.

At any rate, the weather here is frightful, and we're leaving to go south and east in about 4 days, and I'm going to fly the wings off a couple of airplanes during the next two weeks.


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RE: Catalina PBY2 - Budd Chappell - 4/10/2009 6:34 PM   
siddus74



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Status: offline 		Bob, hows things going on the cat?

Scott.


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RE: Catalina PBY2 - Budd Chappell - 4/10/2009 9:37 PM   
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Status: offline 		Hi, Scott

Total standstill. I have everything I need to complete it, but I just got burned out on building. The TopFlite Mustang took more out of me than I realized. I'll probably wait until my dad comes here for the summer and then start up on it again, as he is ex WWII US Navy, and really has a soft spot for the Catalina. Meanwhile, the flying weather has finally arrived here, so off to the field I go with Das Ugly Stik

Regards


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RE: Catalina PBY2 - Budd Chappell - 4/20/2009 7:40 PM   
Mustang Fever



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Status: offline 		Kinda looks like a minature boat yard, doesn't it? With all the uprights holding it in place?

Anyway, back to work. We had three days of lovely, early morning flying weather here, so I got in a lot of stick time on my old, reliable Lanier Mariner 40. (My Arrow is now out of service- too many bumps while learning to fly it. I'll have to build another someday.)

The rain and cold moved back in yesterday, so I've been splitting my time between the PBY and flying a CP Pro 2 electric heli in my garage.

I'll be sheeting the hull bottom with pieces of 3/32" balsa that will fill each "square" the way Bud described in the instructions. I'm also going to reinforce the edges of each square so that I'll get a good bond between the bottom and the structure. Finally, the grain is going on lengthwise. I learned my lesson the hard way about cross ways sheeting on the Arrow. Cross grain may be ok for land planes, but it caves in at the slightest hint of a rough landing with a water bird.

Check out this URL. I think I've found my next seaplane.

https://mraerodesign.securicom.ca/en/products/info.cfm?ProduitID=1


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RE: Catalina PBY2 - Budd Chappell - 4/20/2009 7:46 PM   
siddus74



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Status: offline 		Bob,

Glad your getting back to the Cat, I have finished glassing the entire sunderland fus, so she is ready for paint . . . Will try and get some pitures later! What happed delta?

Scott.


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RE: Catalina PBY2 - Budd Chappell - 4/20/2009 9:44 PM   
Mustang Fever



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Status: offline 		The Arrow suffered mightily at my hands while I was learning to fly it. She was my first delta. I tried five or six takeoffs that ended with it upside down until I learned to keep the wingtips out of the water with aileron. My first landing was really a crash- my approach was like a "normal" seaplane, level and kinda fast, and when she touched she skipped up like a stone. The natural reaction is to nail the throttle and go around, and of course the high mounted engine resulted in an instant faceplant. That banged up the left wing as well as some of the bottom, and she was pretty well waterlogged and took a long time to dry out.

I made a number of bad landings after that, until I learned to make a shallow approach with some power on, and then cut the power and haul the nose up to about 40 degrees when close to the water. By then it was too late. There's so much structural damage that the airplane is changing shape- the covering keeps getting loose and all the trims changed on me. I'm afraid to fly it anymore.

Good news is, there's a laser cut short kit for it here:

http://lazer-works.com/rcm.html

I have one of his kits for the Super Kaos, and it is sweet. I'll order one someday, but not until I can afford to go electric. A good electric setup will result in a weight savings of almost a pound, due to not needing so much weight in the nose for balance.

Also, I found several more nice shots and the history of the one I'm modeling. Turns out she's kinda famous- during one mission she deep sixed a U boat and the pilot (J. L. Cruickshank, of Aberdeen, Scotland) received a V.C. for it.

Cheers

PS Keep up the good work on that Sunderland

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< Message edited by Mustang Fever -- 4/20/2009 9:45 PM >


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