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Balsa USA 1/3 scale Boeing Stearman PT-17/N2S-3

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Old 08-27-2017, 04:36 PM
  #1
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Default Balsa USA 1/3 scale Boeing Stearman PT-17/N2S-3

Kicking off a Balsa USA 1/3 scale Stearman tips & tricks thread, selfishly in hopes of learning from some of the experiences from the many folks flying this beautiful airframe.

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Old 08-27-2017, 04:48 PM
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My project started with the following build components:

- BUSA kit w/Sierra struts
- Moki S250 ("top hat" ignition, Sparkswitch 5.5v, Emcotec fuel pump)
- PowerBox Royal SRS, Spektrum
- DuBro 50 oz fuel
- Hitec 5645MG aileron, Futaba S9156 rudder/elevator
- Axels Scale Pilot
- Duralite Sentinel A123 batteries;(2) PowerBox, (1) pumps
- AR iCharger on board charger
- Solo 32" scale prop; prop hub

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Old 08-27-2017, 05:01 PM
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A few build pics along my journey

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Old 08-27-2017, 05:24 PM
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Covering

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Old 08-27-2017, 05:45 PM
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Dry fitting components

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Old 08-27-2017, 06:20 PM
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Paint booth

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Old 08-27-2017, 06:31 PM
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more paint...

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Old 08-27-2017, 06:36 PM
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putting color on the wings...

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Old 08-27-2017, 06:45 PM
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Component change

Along the way, decide to make a few changes:

- switched to Savox SV1270TG HV aileron servos
- changed from PowerBox Royal SRS + Spektrum to PowerBox Royal SRS + Futaba 7003SB Rx's
- switched from DuBro 50oz tank to (2) Extreme Flight 50oz tanks for fuel & smoke
- added Powerbox smoke pump
- switched from Duralite Sentinel A123's to PowerBox PowerPak 5.0X2 Pro batteries
- deleted AR iCharger on board charger

Last edited by marksp; 08-30-2017 at 03:00 PM.
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Old 08-27-2017, 06:52 PM
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more pics...
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Old 08-27-2017, 07:06 PM
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Ok...now for some questions for anyone building/flying a BUSA Stearman. Need to sort out my solution for flying wires. I currently have the BUSA rods/ends as well as the BUSA sourced braided steel cable and Nicopress system. My preference is ease of setup/tear down vs "scale". My current plan is to build and fly the cables, and also build the rods which are required as templates for the custom scale flying wires offered by aeroscaleproducts-prospect_en

Any guidance recommendations to share? Is the cable setup the easiest, most practical solution?

Cheers

Last edited by marksp; 08-27-2017 at 07:12 PM.
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Old 08-27-2017, 07:25 PM
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Any tips on where to source a 1/3 scale shock plaque found on fuse above the landing gear?

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Last edited by marksp; 08-28-2017 at 05:59 AM.
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Old 08-27-2017, 07:34 PM
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Any balancing/CG tips from anyone flying Moki S250 - any ballast required? how much? where placed? trying to pre-sort component placement

Cheers

Last edited by marksp; 08-27-2017 at 08:27 PM.
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Old 08-28-2017, 06:35 AM
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Quote:
Originally Posted by marksp View Post
Any tips on where to source a 1/3 scale shock plaque found on fuse above the landing gear?

Attachment 2229673
That would be very simple to make. Do that sort of thing with great regularity.
If you PM me the dimensions and text as it's placed - a good close up pic would be perfect - I'll do one for you for free and send it your way.
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Old 08-28-2017, 01:40 PM
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Quote:
Originally Posted by marksp View Post
Any tips on where to source a 1/3 scale shock plaque found on fuse above the landing gear?

Attachment 2229673
Mark,
If you could get a good quality close up of the placard i bet you could have them made by a trophy shop in real metal..
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Old 08-28-2017, 07:21 PM
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Quote:
Originally Posted by Greg Wright View Post
Mark,
If you could get a good quality close up of the placard i bet you could have them made by a trophy shop in real metal..
Excellent idea...thanks! That's precisely the effect I'm looking for! Like the metal plate on full scale.

I'll swing by a trophy shop to see if they can make.

Cheers
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Old 08-29-2017, 03:55 AM
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Some of the modeling graphics suppliers can print "metal".

If what I have in the pic is what you are looking for, it may be worth investigating.

Unfortunately, the company that provided mine, in no longer in business, or I would provide a link.
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Old 09-01-2017, 12:25 PM
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Mark,

Good to hear from you and you arer making great progress with the PT-17 build. Now on to some answers. I used the recommended tail brace set-up per the plans and have been happy with the results. However, I DID NOT use the solid wire for the flying/landing wires. Rather I purchased the BalsaUSA 1/3 Scale Deluxe Nicropress Starter Set and am satisfied with the results. I have attached a couple of pictures which show the details. I bought the wire thimbles from Vogelsang Aeroscale. The business end of the wires are Sullivan Products 4-40 eye bolts (#549) and Dubro 4-40 Steel Threaded Rod Ends (#302). I purchased ” 4-40 SS socket head cap screws from Bolt Depot.

If I am not interrupted during the field assembly process, it take me 30-40 minutes to put the plane together, ready to fly. For what ever reason, it seem I always have to adjust several, if not all, of the flying/landing wires. Teardown takes half the time. Definitely not a plane I take to the field every time I want to fly, but I do put it up every 4-6 weeks.

Keep us posted on your build and let me know if I can help with anything else.

Gary
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Old 09-01-2017, 11:13 PM
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Gary - thanks for sharing the detail and pics. I had not considered your setup using the rods for the tail brace per the plans, but using the cable for the wings. I like that a lot!

With regards to your flying wire cables, do you also have a javelin/spreader? If so, where did you source?

Cheers
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Old 09-02-2017, 05:56 PM
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String mock up to determine cable order length. 34' - wow!!!

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Old 09-12-2017, 08:08 PM
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After searching and searching, I shot a note to Callie t see if she had ideas for sourcing the Stearman shock plates. She responded she had the images and can make out of realistic looking metallic adhesive material. Received today and can say they look fantastic!

Here's a pic of the shock, serial # and engine plates from Callie.

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