Platt Zero Build Thread
 

I just started an 80" Platt Zero, and figured I'd take pictures and ask questions as I go along. Based on some other RCU threads, the Platt kit seemed a good choice because of it's good scale presentation that's also easy to handle and fly. This is the plane Dave entered in the 1983 Scale Masters final, scoring an all-but-perfect 98.5, the highest score ever achieved in Masters competition.

I kept an eye out and was VERY happy to find [link=http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&_trksid=p4340.l2557&amp ;rt=nc&nma=true&item=160536259742&si=0 OVKom1haluUVdOw%252BA3KGtPkAH4%253D&viewitem=& amp;sspagename=ADME%3AB%3AEOIBSA%3AUS%3A1123]one for sale on ebay[/link]!

I haven't yet decided which version (the square-tipped A6M3 "Hamp" or the A6M5 "Zeke" ) I'm going to build, although I'm leaning toward the Hamp.

SPECIFICATIONS:

Scale 1:5.5 (2.2” = 1’). Wing span 78-3/4". Wing area 1,090 sq. ins. Weight fully equipped 14-18 lbs. Flying speed 75-90 m.p.h.

My ebay prize included a lot of great parts:
[ul][*] plans with basic instructions and a terrific cutaway drawing, [*] all the fiberglass parts (cowling, gun hood, tail cone, drop tank)[*] a canopy[*] two spinners (one for flying and one for static display with resin prop blades)[*] molded resin exhaust banks (for the Zeke)[*] a scale resin pilot[*] pneumatic retracts[*] a Dave Platt scale cockpit set and some other assorted pieces.[*] a Super Tigre S2000 Engine (new in the box)
[/ul]

All for about $400 plus shipping.

OK, first questions:

1. Before I do anything with the fiberglass parts or canopy, I'm considering making molds of them in case I need to replace any of them later. Does anyone have any recommendations on this?

2. I have a Zenoa G38 that I picked up at a recent auction for this plane. I'm pretty sure that this will be a good choice, but what does everyone else think before I make an irreversable committment?


Regards,
-Skip

RE: Platt Zero Build Thread
 

Great choice of projects Skip, I'm subscribed! As much as I like the big Super Tigers, I would definitely go with the G-38 if it all fits in the cowl nicely. The reliability of the gassers, as well as the fuel economy, makes it an easy choice for me. As for the glass parts, I'm pretty sure they are all still available from Dave (although for how long nobody knows). I think I'd just purchase a spare set of parts from Dave before I'd go to all the trouble of molding my own. One other bit of advice, paint up the Platt pilot and use him for a nice paper weight but don't stick him in your airplane! Good luck with your build. Oh, and just in case you're counting votes, mine would be for the Hamp.

RE: Platt Zero Build Thread
 

subscribed, Hey Chad, why not use the pilot?

RE: Platt Zero Build Thread
 

They are VERY heavy Ram-bro.

RE: Platt Zero Build Thread
 

Thanks, Chad. One vote so far... Hamp:1, Zeke:0

I'm also debating about using the cockpit kit this time maybe save it for a future build.

I agree with you on going with gas. But I'm not sure what I'll ever use the Tigre for, if anything. My G38 has a spring starter in the engine mount, but it's so easy to start, I dont think I'll ever use it. So I'm wondering if I should just remove it to save the weight.

The cowl is plenty big enough for a G38, but the plans will require some modifications. I'm attaching a picture of Dave's plans showing the glow engine setup. I'm going to have to push the fuel tank backwards a little, and I probably wont be able to get the radio battery into the cowl as shown.

Build Update:

I have completed the Stab and Elevator assembly (except for glassing). Here's some shots of the process. I was able to use my A-Justo-Jig for it so it's super straight!

Dave's hinge design is my first experience not using robart or dubro types. It was interesting cutting out the circuit-board material and getting everything lined up. But the result is really terrific the elevator rotates perfectly and it looks very scale.

I read in some other debates about glues in some other posts, so I'm using titebond mostly, reservng the CA for when I need something to set up instantly. It's been a while since I did it this way in fact it's been over 30 years! I recall building my first RC plane, a Sig Kadet back in High School - yikes, I don't feel that old. As for CA, I will probably use it when I plank the fuse (no one wants to wait and wait for those strips to stick...).

RE: Platt Zero Build Thread
 

Here's a few more shots of the stab build...

I used WorldTex to cover the elevator. This is my first time with it, and I LOVED it. Very very silk-like, and I expect it will paint up perfectly.

Dave's plan requires covering the elevator before covering the rest of the stab. I will have to use liberal amounts of masking tape when I glass the stab to keep from gluing on the elevator! I think I will be able to rotate the elevator enough to get masking tape well under the balsa overhang.

Am I having fun yet? Most definately!

RE: Platt Zero Build Thread
 

How large of a wing will the A-Justo-Jig accommodate? And was there a jig included for the holes you drilled into the ribs?

Thanks,

Bob I.

RE: Platt Zero Build Thread
 

Glad to see another A-Justo-Jig user. I love using mine. Takes a minute to set things up but once set up it's great.

RE: Platt Zero Build Thread
 

Got the top half of the fuse planked.
I'll post some photos tomorrow eve.

RE: Platt Zero Build Thread
 

hey skip im building the zero as well except mine is from plans if u build molds let me know and i will buy some moldings from u...

RE: Platt Zero Build Thread
 

Hi Bryan. I did make molds for the tailcone and gunhood so far. I'll post pics of them (hopefully this evening). My new epoxy just arrived so I'm going to use them and see how well they work out hopefully by this weekend.

I still have to make molds of the nosecone, canopy and drop tanks.

I intend to use my molded versions on this plane and save the ones I got with the kit for later rebuilds.

-Skip<br type="_moz"/>

RE: Platt Zero Build Thread
 

I've nearly finished the fuse. I planked it as Dave's instructions recommend. Used a stripper with a slightly "bent" blade to get the edges slightly angled to work around the fuse.

RE: Platt Zero Build Thread
 

Skip,

So far, so good with your build.............:D I have what may be a dumb question for you regarding your stripper. How did you make opposing angles on each strip for the fuse. I'm sure there's a simple explanation, but I cannot get my brain around it.

Thanks and keep up the great work...............:D:D

David

RE: Platt Zero Build Thread
 

Hrcflyer,
To get opposing angles on the strips, I cut a strip and then flipped the board before cutting the next strip, that way I alternated whether I was cutting from the "top" or the "bottom" of the board to get strips that were beveled correctly. Does this make sense? I'm not sure if I can sow it in a picture.
-Skip

RE: Platt Zero Build Thread
 

Here's some more pix as I built the fuse. I'm sorry not to post more frequently I have to chose how to spend my limited time, and "building" usually wins (grin)!

RE: Platt Zero Build Thread
 

And a few more... (at least I'm taking the pix as I go, right?). Wait til you see the problem I had with the rudder horn interfering with the tail wheel retracts! Argh!!!

RE: Platt Zero Build Thread
 

And...

RE: Platt Zero Build Thread
 

And finally...

I seriously considered wetting down a 1/8" sheet with windex rather than strip covering, but there's a place just before the rudder where the angles seemed too compound to work right. As I did the planing this proved true. In the end, Dave's guidance is spot on (as usual).

I used titebond instead of zap. It took longer, and I kept running out of pins and clamps, but the result seems really strong and feels "traditionally" good in a self-satisfying way.

RE: Platt Zero Build Thread
 

Did some more fuse work today, but I wanted to share the rudder control horn problem I had with using the robart retract tailwheel...

First of all, I decided to do pull-pull for the rudder instead of the plan's control horn. Then I realized the in either case, the horn would interfere with the retract (when up)... so I redid a new control horn with a big "U" in the middle... I hope the pictures make it clear...

It's all installed now, and the linkage is solid.
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RE: Platt Zero Build Thread
 

And here's a couple showing it with the linkage...

For the retract, I had to bend a control horn to move the "throw" from the plan to just above the retract assembly... This very nearly conflicted with the elevator horn... ugh! Anyway, by off-setting it a couple mils, it worked out fine. A little threadlocker on the clevis screw and we're all set!<br type="_moz" />

RE: Platt Zero Build Thread
 

Subscribe[8D]

RE: Platt Zero Build Thread
 

I modified the plans for the Platt retract unit so that it could be constructed out of PC board but operate just as the original, it works great and is very light weight. I see you are going a different route, but this could be useful for others looking through this thread at a later time. I scaled it for the CMP 71" Zero, but it would be easy to enlarge slightly for the Platt Zero.

RE: Platt Zero Build Thread
 

That is a sweet looking tailwheel! Wish I had seen it sooner.
-Skip

RE: Platt Zero Build Thread
 

Here's some more photos as I build this puppy!

These are:

1. Cutting the slot in the the canopy slides.
2. Installing 1/2" gun ports in the gun hood
3. Installing the tail-cone. Including fairing it to the elevator...

RE: Platt Zero Build Thread
 

Here's work on mounting my Zenoah G38. This bird should be well powered.

As you can see from earlier in the build thread, I also have a Super Tigre engine that Ron sold me with the kit, but I really wanted to have a smoke capability so we could simulate some "dogfights"... so gas seemed the way to go.

But... since this is my first gasser, I nearly had a catastrophe... important safety tip for all us glow guys... DO NOT presurize the gas tank from the muffler!!! I'm lucky I didn't have a fire on my test bench. The more you know....

-Skip