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Author Topic: Bostonian Bede BD5  (Read 9922 times)
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Yak 52
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« Reply #75 on: October 10, 2012, 11:20:20 AM »

Making some progress with the trims. I went for red and orange esaki backed with white floral spray (two light coats) It seems to have kept the colour nice and bright. The strips are stuck on with glue stick because dope/cellulose thinners melts the floral spray Sad Hope to get it done for the next Impington at the end of the month  Undecided
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Yak 52
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« Reply #76 on: October 10, 2012, 04:57:14 PM »

Well the trims are complete. I'm quite pleased at how slimming the stripes are  Grin it looks less Bostonian and a bit more jet-like. I'll take some better pics in daylight tomorrow. I have some laminated prop blades drying in the airing cupboard now too Smiley
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Sky9pilot
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« Reply #77 on: October 10, 2012, 06:34:30 PM »

She's a Beaut!

Love the trim stripes.  Very well done and really sets off the scheme!

Tom
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« Reply #78 on: October 10, 2012, 08:20:21 PM »

I agree with Tom. The coloured stripes really bring that model to life.
That wouldn't be some proposed sketches for a bungee tow launch glider in the background of one of the pics ?
John
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Yak 52
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« Reply #79 on: October 11, 2012, 07:29:18 AM »

Thanks Tom, John.

Yep, I've been doodling again John. Can't decide on quite which way to go... It's an interesting task with the restricted wing span.


Jon
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Yak 52
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« Reply #80 on: October 16, 2012, 05:46:07 PM »

I've been working on the laminated pusher prop. It's 'reversed' so that it is wound in the same way as a tractor, rather than having to think about which way I should be winding it  Cheesy

The blades are laminated from thinned 1/32nd sheet, moulded at a 15 degree angle on a 2.5" diameter spray can. The airfoil was sanded in, then the blades were attached to the bamboo in a jig. Then it was covered in black and yellow esaki. There will have to be a small cut away to clear the tail block.

The final weight is 0.8 grams, which I'm pleased with, especially considering it's in the wrong place  Roll Eyes

The blade angle at the 75% radius point is 30 degrees which gives it a Pitch/Diameter of about 1.3 (and a bit). Some predictions from Prop Picker are quite encouraging:

Motor space:             12.75"
Motor length at 1.5x:  19.2"
Motor:                       2 strands of 1/8th
Turns:                       2100
Motor run:                 82 seconds
T/TO:                       2           (intial thrust ratio)
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« Reply #81 on: October 17, 2012, 01:25:58 AM »

That looks interesting Jon.! Hope you have a test flight window in the weather soon.
John
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Phugoid
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« Reply #82 on: October 18, 2012, 04:27:45 PM »

Lovely job Jon, the prop is a real work of art.

I can scan your plan full size if you need......

Andrew
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Yak 52
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« Reply #83 on: October 18, 2012, 05:01:56 PM »

Andrew, that would be extremely kind, thank you! I have some adjustments to do first but I may well take you up on that, logistics permitting.

Cheers
Jon
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Yak 52
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« Reply #84 on: October 25, 2012, 12:09:25 PM »

Not far now: Final weight of all the components before assembly is 12.8g. Just got to stick it all together and attach the prop...

Jon
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« Reply #85 on: October 25, 2012, 03:01:54 PM »

Very tasty. Well done.

Hope to see some in-flight pics soon!
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Yak 52
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« Reply #86 on: October 27, 2012, 08:37:28 AM »

Thanks dosco.

Pretty much done now... needed about 3g of noseweight to bring the CG to the calculated position. Test glides indoors have been a bit inconclusive but it seems about right. Too wing to glide it outside today.

I have extended the UC to give a bit more prop clearance (that's what the bends were for!) The UC is nice and springy but the rear gear is close to the CG and when the nosewheel hit's first iyt bounces and causes the model to pitch nose up, especially in a heavy landing. I hope it'll be ok in a steady glide at the end of a flight indoors. I can play around with the UC heights to perfect the rotation and ROG.


Jon
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Yak 52
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« Reply #87 on: October 27, 2012, 08:43:22 AM »

A few more pics...
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Laurence Marks
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« Reply #88 on: October 27, 2012, 11:03:51 AM »

That is a fantastic looking model.  Would love to see some flying shots.  As if there aren't enough projects on the to-do list...
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Dave Andreski
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« Reply #89 on: October 27, 2012, 11:17:53 AM »

Jon,
VERY NICE, CLEAN build!
Dave Andreski
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« Reply #90 on: October 27, 2012, 11:29:45 AM »

Lovely work sir - can't wait to see the plan . . .
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« Reply #91 on: October 27, 2012, 11:33:53 AM »

Me too! Gorgeous model...
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« Reply #92 on: October 27, 2012, 04:04:05 PM »

Looks very cool, and very nicely built! Looking forward to flight reports.

--Ates
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« Reply #93 on: October 27, 2012, 05:20:15 PM »

A very nice looking model Jon. As others have already said, the trim stripes do add to the appearance of the model and I love the delicate look of the whole scheme.

I hope you are rewarded with good flying characteristics that compliment the good looks.

Paul
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« Reply #94 on: October 28, 2012, 04:07:50 PM »

Hello John,
It was nice to meet you, albeit briefly, at Impington today. The Bede looked superb, such a pity about the leading
edge dings. I hope the repairs aren't too troublesome. Your Cub is very smart and looks very good in the air. I gave
a copy of the Cub plan to a mate who wasn't too keen about it but after seeing yours he went home to start
cutting wood. I hope your journey home was OK, I had heard there was trouble on the 14 but it had probably
cleared by late afternoon. I hope to see you again in March 2013.

Bye for now,

Tony.
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Yak 52
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« Reply #95 on: October 28, 2012, 06:04:52 PM »

Thanks everyone for the kind comments. Tony, it was nice to meet you too. The dings will polish out  Roll Eyes I think outdoor trimming when it's repaired though! My mate Phil did manage to video the single half (quarter  Undecided) decent flight. I think I hadn't got enough rubber in it so it just skooted along the floor too far before rotating. Hopefully I'll get it into circling trim from a hand launch and then work on the ROG.

Jon
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« Reply #96 on: October 30, 2012, 10:07:18 AM »

Well, here's the best 'flight' on video, plus a couple of proper pics from Phil. The damage can be repaired easily enough but maybe a tougher LE would have been better.

On reflection I think I was a bit ambitious trying to trim it at Impington. The model seemed quite keen to leave via the fire exit...

http://www.youtube.com/watch?v=4UkATJ0sGf4&noredirect=1
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« Reply #97 on: October 30, 2012, 12:56:27 PM »

I was going to press the "like" button.........
because I really really liked it.....
But, then there was that bit at the end that.....if I gave it a 'like' you might think I liked that part.
Can we have them move the fire exit door to the wall on the right? Cheesy

Tony
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Instructions: Step One...Assemble the pile of sticks shown in pic "A" to look like the model airplane shown in pic "B"........
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« Reply #98 on: October 30, 2012, 01:20:16 PM »

You are a brave man to try trimming at Impington! Lovely meetings but a tad on the small side for a new model. Looked good, though!

Cheers,

Dan.
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Yak 52
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« Reply #99 on: October 30, 2012, 01:56:33 PM »

Cheers Dan.

But, then there was that bit at the end that.....if I gave it a 'like' you might think I liked that part....

Ha ha, I thought that was the best bit  Grin Saved the prop nicely. In fact I'd vote for a nice rail all the way round the hall  Roll Eyes
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