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Old 01-19-2012, 02:43 AM   #1
The_village_idiot
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Default 46" Hall Bulldog Racer build

Hello all. First post here.

I have been working on a 46" Hall Springfield Bulldog for a while now. It has been really slow progress and I finally got the camera out for some pics. I guess it takes a few posts before you can add pics so I will continue in another post.

Cheers.
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Old 01-19-2012, 02:46 AM   #2
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To continue...
It is based on a set of plans from Cleveland Model Supply for a rubber-band powered model. The base plans are for a 40" model, but I stretched it to 46" to reduce the wing loading a bit. The estimated all up weight is about 22 oz.
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Old 01-19-2012, 02:49 AM   #3
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I have been fumbling my way through the build for about a year now. Pics next.
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Old 01-19-2012, 03:01 AM   #4
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So finally, some pics.

I almost have it all framed out. Here it is with some of the bits in place just for fun.

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Old 01-19-2012, 06:27 AM   #5
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Very cool. The gull wings on this plane always catch my eye.

At 22 ounces it ought to fly nice.

"Gravity: Natures way of telling you to watch your airspeed"
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Old 01-20-2012, 01:43 AM   #6
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Wow!

Nice looking plane. I like it.

What kind of power set up you plan on using?

Cheesy poofs are what Yankees get when they eat Southen Food!! bub, steve
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Old 01-20-2012, 03:19 AM   #7
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Wow! A beauty! Nice size, too. Wish I had the skills and patience for building like that. I'll be watching the progress!
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Old 01-20-2012, 07:59 AM   #8
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Thanks all.

I am planning to power it with a 400 outrunner and 2S LiPo. Not looking for really fast performance, just something to cruise around with. I hope that is enough. My pilot skills (or lack thereof) can't handle anything too fast anyway.

I will post more progress pics as I go (slowly...).
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Old 06-04-2012, 02:24 AM   #9
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Default Build Update...

Been a while but I finally made more progress on the Bulldog.
Here are some pics. I decided to not put all the trim detail on it yet, so it is just covered in a basic red at this point. I will see if it actually flies before I spend too much time with all the trim.
The AUW came in at 19.9oz with my original 400 outrunner/2S setup. After looking checking all the specs again I think that setup was going to be way underpowered, so I am going to try a 3S. Once I have that I expect the weight to go up but I am still pretty happy with ~20oz. I managed to save some weight by changing from my original balsa and paper dummy engine to one made from blue Dow. The orginal plastic pilot didn't make the cut either because he was too chubby. His lightweight friend made out of blue Dow too his place. Those things probably saved an ounce or two.
A few more details to clean-up and then it is time for the maiden...



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Old 06-04-2012, 03:05 AM   #10
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Looks fantastic. Are you going to maiden it soon? Please get a video if you can!

Dave

"Gravity: Natures way of telling you to watch your airspeed"
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Old 06-04-2012, 03:06 AM   #11
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Your plane came out great, and looks beautiful. You did a great job with this plane hope your maiden goes well.

Might want to change your user name to The village Builder.
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Old 06-11-2012, 02:34 AM   #12
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Default Successful Maiden!

Good news!

I finally maidened the Bulldog early this morning, and it went really well. I am still working on piecing together a video but the footage isn't very good. I will post it soon.
As I mentioned earlier, I decided to go with a 3S battery. My WattsUp told me I was using about 100W, which ended up being plenty for this plane (AUW: 20.9oz). It is a real floater. Cruises around at ~1/2 throttle. This leads me to one of the issues I have with the plane - it tends to climb steeply with additional power. Anybody have suggestions for the fix? Maybe more downthrust in the motor mount?
Other than that, it flies suprisingly well for my first scratch build. Pics/video to come soon.
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Old 06-11-2012, 05:07 AM   #13
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Originally Posted by The_village_idiot View Post
Good news!

I finally maidened the Bulldog early this morning, and it went really well. I am still working on piecing together a video but the footage isn't very good. I will post it soon.
As I mentioned earlier, I decided to go with a 3S battery. My WattsUp told me I was using about 100W, which ended up being plenty for this plane (AUW: 20.9oz). It is a real floater. Cruises around at ~1/2 throttle. This leads me to one of the issues I have with the plane - it tends to climb steeply with additional power. Anybody have suggestions for the fix? Maybe more downthrust in the motor mount?
Other than that, it flies suprisingly well for my first scratch build. Pics/video to come soon.
Congratulations!

I am very interested in this plane as I love the Golden Age planes. I like the size of this plane as well. Just right for a park flyer.

Dave

"Gravity: Natures way of telling you to watch your airspeed"
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Old 06-11-2012, 12:32 PM   #14
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Wow! What a nice plane.

I'd say a little more down thrust might work.
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Old 06-15-2012, 03:18 AM   #15
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Default Video of maiden

Here is some video of the maiden flight. Sorry, the footage isn't very good - but it does actually fly.
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Old 06-15-2012, 03:36 AM   #16
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TVI,wow! she flys great!! very nice build and looking forward to the decals. i like the way you video'ed the full scale ,your looks just like it.

thanks for sharing the pictures and vid,and welcome to wattflyer. there's a bunch of us who like building[and i don't mean arfs].

stu

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Old 06-15-2012, 03:48 AM   #17
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Congrats! It's a beautiful build.

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Old 06-16-2012, 01:22 PM   #18
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Default BULLDOG!

Very Nice!!

Thanks!
Jimmy
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Old 06-25-2012, 02:51 PM   #19
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nice job. i have various scaled bull dog plans on my bench and just cant figure out the time required for the round formers. i do have a little dumas one that flies nice, yours is definitely a nicer size. where'd you place the battery for balance?
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Old 07-19-2012, 02:45 AM   #20
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Default Finally - graphics and paint

Since the Bulldog proved itself worthy of some additional effort based the maiden flight, I finally finished all the graphics, etc.
Some pics are posted below.

paulatgis - I had to put the battery waaaay out front, almost directly under the motor. I had to scallop out the back of the dummy engine to get it in there. With the 3S battery there, I get the CG about 30% back from the leading edge at the root. Here are a couple of pics.


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Old 07-19-2012, 02:53 AM   #21
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I'm sad that all your build pix have disappeared.

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Old 07-20-2012, 02:30 AM   #22
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Default Build Pics

I wish I had taken more build pics along the way but here is what I have.
Took it up for a second maiden now that all the graphics are on. The graphics and paint added another ounce (!) the the weight (AUW 21.9oz). Still flies well but it may be a bit twitchy for my dumb thumbs. I am going to adjust the servo horns a bit to help.


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Old 07-26-2012, 03:50 AM   #23
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oh the bull dog is twitchy alright. mine flew twitchy as well when on ailerons so I dump them and made it rudder elevator only. big improvement. mines the little dumas version with enlarged wings. I've made many scaled up plans for one your size. been pondering a very large one for some time now - 70 plus wing span.

i like yours and might just have to build another like it.

my pic is from a video, so quality is bad. once I got it dialed in (nicely flying) I just flew it and had fun and never bothered to take more pics.

Bull dogs have that cool look and fly great in the rc simulator!


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Old 12-17-2013, 12:17 AM   #24
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Hi,
I would like a copy of the plans for this plane.
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