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GWS PT 17 Stearman

Old 08-07-2005, 06:20 AM
  #1  
Duster52
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Default GWS PT 17 Stearman

My favorite fun flier, so far, has been my stearman! I did upgrade it with a 400F brushless motor, and Kokam 1500 11.1v Li-Po while keeping the stock prop and gear box. That just gave me lots of extra power to play around with! It would take off almost vertical! The motor and ESC combo was $80. Battery was $37 at LHS.

I made some improvements. There is a site where you can order wooden struts for the wing, which makes the plane a little more stable doing stunts. $5.00 plus shipping!

$10 plus shipping I put a fake radial on it made from vacu formed plastic that I had to cut out and paint. It looked great!

I cut out the fuse where the pilot should be so I could put a pilot in it.

Due to CG problems with the plane (way tail heavy) using the brushless motor, I cut out a space just behind the motor on top of the fuse that would allow the battery to slide all the way forward. I just made a plastic cover for it. Worked great.

I put real wheels on it.
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Old 08-07-2005, 12:42 PM
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Duster - Let's see some pics of the Stearman! I love the way mine looks too, but have never been able to get her to balance without adding over 3.5oz of lead to the nose, which makes her so porky that she isn't much fun to fly.

I was thinking of adding the GWS Beaver cowling to the front and placing the 3S pack inside the cowling, do you think this would work in shifting the CG so I can take out some of the lead?
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Old 08-07-2005, 05:12 PM
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Default whoops!

I went thru the entire process of uploading a couple photos of my stearman and just now noticed they did not make it!

So.....HERE they are! I hope!

If you would like to see a video of it flying just click on my name and my homepage. There is a list of most of my videos. It has Stearman in the name of the vid file that you want to see. You are welcome to view all of them if you wish.

The best winds to you!
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Old 08-09-2005, 09:56 AM
  #4  
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I had one of these for almost a year and really enjoyed it. I went brushless with a geared Mega 16-7-8 and a TP 3S 2100 battery. I had to drimmel out a space for the battery but this larger battery did solve the CG problem with some useful weight. I could fly over 20 minutes very aggressively. Too aggressively in the end as I snapped one of the struts and down she came. Not the airplane's fault as it was not designed for the loads I it was subjected to. Great fun. I put about 15 flying hours on it.
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Old 08-09-2005, 04:24 PM
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Sorry, Nitro! Somehow I missed your post and put my photos up with out reading it! What you are suggesting will work out fine. Basicaly that's what I did. Here's a tip: Take a two liter cola bottle and cut off a few inches of the bottom. Then remove the flat portion of the bottom leaving just enough curve to mate with the back of the motor where you think looks best. Then check to see just how long it will need to be and cut off the unneeded portion from the other end. The tube portion will slide over the GWS PT-17 almost PERFECTLY! There would be different ways to attach. Glue, tape, screws. I just used smooth tape and painted the extention and the tape. Also, you can put a longer stick for the mount to extend the motor a little bit and the upgrade will fill in the gap!

I had a "shoot down" at a local club. I had forgot to change out the Hitec Feather rx with my Hitec HFD-08RD which is dual conversion and shift selectable. The feather is not dual conversion. Someones plane took over and kept turning it upside down to the left! I was fighting in vain to keep it up right. It would level and snap over again. I fought it for about 30 secs when I just lost it and it just went into a spin all the way down from about 75 feet! Over the last year I had cracked up a few times and had a LOT of epoxy applied to it! I decided to put it up and get a new one a little later. I really miss it! I just have a few planes that I need to fly for a while first.

Click below to see most of my projects. If you go to the second page of posts you will see how I did the battery forward thing, before I put on the cowl extension and radial engine upgrade.

http://www.rcuniverse.com/gallery/ga...emberId=110580
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Old 08-09-2005, 04:30 PM
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Duster - Interesting - I was actually thinking of removing the motor all together and using the cowl in the sense of like the GWS Beaver. It seems in my mind that the diameter of a 2 Liter bottle is greater than the diameter of the Stearman fuse. Is this correct? Or are they about the same size?
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Old 08-09-2005, 05:23 PM
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Nitro, on mine, at least, the bottle is very close to perfect fit on the fuse. I will get some other photos for you. The first cowl was a plastic bowl that I had to remove some of the dia to make it fit. Not the coke bottle.

Back in a little bit with the photos.
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Old 08-09-2005, 06:11 PM
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Thanks duster
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Old 08-09-2005, 06:36 PM
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Nitro, here's a few. The first one shows the cover I made for the "move battery forward" upgrade before I put the cowl ext on.
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Old 08-09-2005, 07:03 PM
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Duster - Perfect!!! Thanks - that looks great. I think I am going to resurrect my PT-17 from the dead and give this mod a shot, maybe it will lessen the dead weight in the nose some.
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Old 08-09-2005, 07:09 PM
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Hope it helps, Nitro. Thanks. One more note: I am not sure now whether I used the top or the bottom. Both curve in, one more than the other. Just pick out the one that fits what you want best.
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Old 10-30-2005, 09:23 PM
  #12  
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Default Cowl Suggestion

Look at the white ABS vitamin and food supplement bottles at Costco, etc, they come in a variety of sizes and have a nice curve to the bottom. I made a ring of plywood that glued to the firewall of my Guillows PT-17 and the ABS cowl ring just slipped over it tightly for easy removal and replacment. The ply mounting ring has a number of cutouts to exhaust warm air. Ditch the fake radial, get better cooling of motor and battery pack with open cowl.
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Old 10-30-2005, 09:26 PM
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I happen to like my fake radial that I spent so much time building.
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Old 11-27-2005, 10:48 PM
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Just completed mine: 19.5oz RTF w/TP2100-3S, P-25, 3sGWS servos, Himax 2015-4100, GWS 6.6:1, APC 11X7SF, & JR R600 Ė thereís an extra ounce.
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Old 11-28-2005, 03:16 AM
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Jim,

What did you do to make her balance with the lighter 2015 Himax brushless?
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Old 11-28-2005, 04:25 PM
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CG

1st I donít build heavy (40+ years of doing this), and I opened up the battery compartment so that my TP2100-3S could easily slide in via the cockpit and pass all the way through the front hole Ė could even put the pack in from the front.

Also, I mounted the servos forward of the plan location; needed new control rods/wire.

The RX and ESC are also ahead of the CG; RX can be moved fore and aft if needed.

Youíll note that the CG location extended to the top wing is just ahead of the rear struts; right at the front edge of the mounts.

I put some buttons on the bottom of the top wing and can easily check the balance before each flight.

Iíve got just a bit of nose droop; a safe CG for the maiden. It will be next week during one of our Dome flies ( www.marcee.org ).


Jim

PS: thanks Carlos for posting the "new" strut info in your thread at the better site!
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