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Author Topic: Another Boston Cub  (Read 5721 times)
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OZPAF
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« Reply #75 on: August 14, 2013, 07:52:54 PM »

Ahh the Alaskan version Jon Grin Do you have any scale puddles nearby Cheesy
Good fun.

John
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rgroener
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« Reply #76 on: August 15, 2013, 01:09:57 AM »

Jon, very nice!
I plan to build a float plane for a long time. Good to see that you build one.
Do you plan to ROW it?

Roman
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Yak 52
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« Reply #77 on: August 15, 2013, 04:21:48 AM »

Thanks guys, yes that's the plan. There is a duration ROW class at the Flying Aces in a couple of weeks. Flying this model on a 3/16 motor got me thinking it may have enough oomph for floats. It's a bit of an experiment but I will be able to convert it back to a land plane quite easily.


http://www.peterboroughmfc.co.uk/zfrontpagepics/2011-36-Mick-FA2/WP03.htm
http://www.peterboroughmfc.co.uk/zfrontpagepics/2011-35-Mick-FA1/WP08.htm
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Yak 52
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« Reply #78 on: August 25, 2013, 09:01:19 AM »

Floats are now finished.

The spreader bars are 2mm carbon. The original UC wire forms the front strut, slotting into small pieces of aluminium tube. The rear struts pop into the fuselage where I've added a piece of balsa reinforced with 1/64 ply. The different holes allow adjustment of the float angle for ROW.
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Yak 52
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« Reply #79 on: August 25, 2013, 09:07:54 AM »

Covering is silver tissue with a couple of coats of thinned yacht varnish for waterproofing. The weight of the floats and extra struts is just under 10g giving an all up weight of 27.5g. This is just under my upper target weight. A bit heavy but they are pretty tough Undecided The wire flexes slightly in an 'arrival' but the carbon spreaders are very stiff. There is a clear acetate water rudder just visible on the float transom.

The model has been flown from a hand launch and goes well on 14" of 3/16 rubber, climbing for about the first 20 seconds and getting nice and high. Will have to wait and see if she has enough gusto to get off the pond at the Aces....
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IndoorFlyer
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« Reply #80 on: August 25, 2013, 02:25:06 PM »

Went back and reread the entire thread on this build.  What an immaculate little Cub!  Those floats look great, too.  Noticed that you swapped out the prop', curious if you had flown it with that setup in the wheeled configuration?
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« Reply #81 on: August 25, 2013, 04:26:02 PM »

Noticed that you swapped out the prop', curious if you had flown it with that setup in the wheeled configuration?

Thanks IF. If I recall correctly it has always flown with the blue prop - I may have just used silver for the photos. The blue one is from a Wingleader kit (distributed by West Wings) and has a bigger blade area than the 6" peck.

The videos in post #68 are with the blue prop as is this one from a while back:
http://www.youtube.com/watch?v=_6qRS5navG0
Excuse the waffle...
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atesus
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« Reply #82 on: August 25, 2013, 04:47:04 PM »

Just too cute! I hadn't seen the video before, flies beautifully.

--Ates
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Dave Andreski
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« Reply #83 on: August 25, 2013, 06:28:01 PM »

Jon,
Very nice job on the floats!
Dave
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« Reply #84 on: August 25, 2013, 09:06:04 PM »

Very neat Jon - floats and Cubs seem to complement each other. Can you adjust the angle of the floats relative to the fuselage? i've noticed that most of the rubber powered floatplanes seem to use a a short run and almost jump off the water.
Your moe scale approach may be a challenge to get of teh water - but what the heck - what fun anyway Grin
John.
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« Reply #85 on: August 26, 2013, 01:49:29 AM »

Jon, very cool!
They look great. Keep us informed about flight trimming. I want to see this plane Row Wink

Roman
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« Reply #86 on: August 26, 2013, 05:05:51 AM »

Thanks chaps.

Can you adjust the angle of the floats relative to the fuselage? i've noticed that most of the rubber powered floatplanes seem to use a a short run and almost jump off the water.
Your more scale approach may be a challenge to get of the water....

John, the rear strut attachment has a series of holes so you can adjust the angle (pics in post #78).

The floats look scale but I've tried to follow the formula outlined in Millard Wells' article:
http://www.hippocketaeronautics.com/hpa_plans/details.php?image_id=510&mode=search
And Bill Noonan's Good Tern.

The step is forward of the CG so the model sits back on the rear float. The only real difference is that mine have transoms instead of canoe sterns. I figured the canoe stern gave less buoyancy to allow a quicker rotation in ROW so I skinny-ed up the rear of the float and increased the deadrise angle to reduce buoyancy at the stern.

The pond at the Aces is quite tiny but rubber models need to get away quick because you are using the intial power burst. If you get past that and you're still on the water I suppose you'll just get a loooong taxi  Roll Eyes My hand launch trimming was promising but I was avoiding max turns. On the day I'll get the blast tube out and see if I can get that last bit of real torque.

The Cub has floated ok in the bath but we'll see....
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OZPAF
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« Reply #87 on: August 26, 2013, 07:03:28 PM »

Whoops missed that Jon. I suppose an impromptu pond wouldn't be too hard to organise for tests.
Its an interesting challenge.
John
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« Reply #88 on: September 02, 2013, 06:33:47 AM »

Sadly there was no pond this year at the Flying Aces as the venue cancelled the bowser at the last minute  Sad The ROW event was run as duration from a hand launch instead. It was a bit blowy but a cracking day out.

Managed one video (cheers Phil) of the Cub:
http://www.youtube.com/watch?v=J1avrL75VVI

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Pete Fardell
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« Reply #89 on: September 02, 2013, 06:38:40 AM »

Excellent- can't wait to see it off water. Looks like it's got plenty of oomph.
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« Reply #90 on: September 02, 2013, 09:14:03 AM »

Wow Jon!  Shocked

My heart skipped a beat when she dove for the ground.

Whew! nice recovery

Well Done. Cheesy

Cool
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« Reply #91 on: September 02, 2013, 09:33:29 AM »

Wow - got a lot of height in the wind. Nice flight.
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Tim
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« Reply #92 on: September 02, 2013, 11:48:37 AM »

Thanks guys.

My heart skipped a beat when she dove for the ground.

Joe, yeah the torque roll is pretty fierce and in theory the motor will take still more turns  Shocked (This was 1000 on 14" of 3/16) I did try adding right thrust at a previous session but it seemed to hurt the later climb. I need to try it on water, then if there's any excess power I'll try a longer motor.
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OZPAF
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« Reply #93 on: September 04, 2013, 07:29:23 PM »

It needs guns as well Jon Grin What a great flight following the ground strafing run. The floats must be helping with their extra side area and they certainl didn't seem to affect its duration all that much. Did you miss those trees?
John
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