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Author Topic: Bill Brown's Spirit at USIC  (Read 2548 times)
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Art356A
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« on: May 28, 2012, 07:09:59 PM »

While there were no classes for them, the Brown designs made their presence known. I brought one normal Yvette (pictured) and a lightweight one which didn't photograph as well. Then a bunch of kids rolled in from Smyrna, Georgia with a whole flock of hand-launch Holly P's, all of which were spectacular flyers, despite obvious battle damage on most of them. This little guy won the mass launch by a wide margin. The black and green one was flown by a young lady with a heavy hand on the winder, and could have placed well in the "race to the roof" if it were entered. The orange/black job climbed quickly to the top and just lingered there circling. Bill was a genius and we miss him.

The orange Yvette is 8" span and is covered with newspaper delivery film, wt. 4.97gms. Yvettelet is the same dimensions but weighs 1.6.

Art.
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Bill Brown's Spirit at USIC
Bill Brown's Spirit at USIC
Bill Brown's Spirit at USIC
Bill Brown's Spirit at USIC
Bill Brown's Spirit at USIC
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My arms are so weak, it's like that pushup I did last year was a total waste.
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Russ Lister
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« Reply #1 on: May 28, 2012, 08:01:17 PM »

Wow Art ... this has really moved me Smiley
When someone has gone there are those odd subsequent moments when you think, 'I wish I could them about this' - I wish Bill could see this now.
Bill was very close to the children in his family ... some of the names of the models point to this too.
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frash
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« Reply #2 on: August 14, 2012, 01:01:46 PM »

Capacitor-Powered Yvette

After seeing plans for the late Bill Bown’s Yvette tandem, and seeing and reading about Art Holtzman’s planes,  I wanted to build something similar. When I first met Art at the USIC, he handed me the impressive Chain Gang winder to wind for one Yvette flight. My table was across the floor from Art’s but I could tell that he had many successful flights from both versions of his Yvettes.

I diverged a little from the plan. This one was scaled up to 30 in2 wing (or stab) area (3.15-in chord * 9.44–in span). I stretched the distance between the wing TE and the stab LE to one wing chord. A 10-farad, 3.7-volt capacitor powers a 7-mm, 3.3-ohm pager motor from BSD Micro RC with a TriTurbofan 65-mm prop. Yesterday’s successful outdoor flight used 15 seconds charge and flew for 1:05 and almost outside the park field.

Most previous flights had been indoors with a colder (10-ohm impedance) motor from David Lewis (homefly.com) that gave only about 30 seconds of flight. Finally I realized that I was using a duration motor that was not powerful enough for this Yvette, but was great for the trial Science Olympiad event called Wright Stuff-Capacitor. There is also a 2.3-ohm, 7-mm motor from BSD Micro so we should be able to match a motor to our needs.

AUW was 12.5g. Landing gear mount is from BSD MicroRC and wheels are fiberglass from Plantraco.  CG was about 0.2” behind the wing TE or at the center of the motor mount upright post.

The plastic wrapper film for newspapers seems durable but a little stiff, heavy, and hard for me to cut. It was applied with Elmer’s contact cement thinned with Bestine as instructed here on HPA. You might note some black lines on this model. These are 0.010 or 0.011 carbon rods as advocated to me by OlBill (Gowen). The sliced ribs are 4% Simplex. The top “spar” is a carbon rod. 

Fred Rash   14-August-2012
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Re: Bill Brown's Spirit at USIC
Re: Bill Brown's Spirit at USIC
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Art356A
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« Reply #3 on: August 14, 2012, 11:48:46 PM »

I think my paper guy tosses them more gently so the bags don't get as wrinkly. But I like the bag film because it's easy for hamfisted people to handle, it's airtight without doping, and the price is certainly right.

I was having issues with Yvettelet. it had only a single nose bearing (no down or side thrust), which itself was okay, but I used a very short propshaft and was getting a lot of knot interference between the hook area and the structure. The other problem was having to add tailweight to get it to fly. I hate tailweight. Once I got it home, I made a new, longer prophook that got the front of the motor out in the clear, and added a 3/4" stinger to the tail end of the motor stick with the hook on the very end of it. This moved the CG back to where it belonged and gave me something to grab onto for a smooth ROG.

If I was a real indoor guy, I could have made those mods on site.

I'll bring the Hollys next year.
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My arms are so weak, it's like that pushup I did last year was a total waste.
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« Reply #4 on: August 24, 2012, 04:57:26 PM »

My capacitor-powered Yvette was again flown outdoors on a beautiful day on Wednesday, August 22. With 10-15 second charging times, flights were 47, 28, 35, 34, and 57 seconds as I tried to improve trim and seal down small places where the film separated from the wing LE and TE.

Then came the expected OOS thermal flight of 6:17+.  I could have seen it slightly longer, but I had to cross a street and climb a hill and was unable to spot it again very high and near the sun. It was not designed clearly for either indoor or outdoor but still was a pleasing and interesting design, thanks to Bill Brown and also to Art356A.

Fred Rash
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« Reply #5 on: October 24, 2012, 09:30:03 PM »

Capacitor Powered Yvette

Quote
These are 0.010 ... carbon rods as advocated to me by OlBill (Gowen). The sliced ribs are 4% Simplex. The top “spar” is a carbon rod.

I used 0.010 carbon rods on top and bottom of both LE and TE and as "top spars" for each flying surface.

To better understand OlBill's use of 0.010-in carbon rods, see his WIF7-150 record setting Category 1 Indoor Hand Launch Glider in the Plans Gallery. He was the source of the idea to use 0.010-in carbon rods to make an I-beam.

Thanks, Bill.

Fred Rash
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Art356A
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« Reply #6 on: December 16, 2012, 10:50:48 AM »

I was flying the phenomenal Yvettelet at Lakeland yesterday and a couple of the guys asked for a link to the plan. I searched around last night and couldn't find it. Has anybody got a link that works?

Art.
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Dave Andreski
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« Reply #7 on: December 16, 2012, 12:45:39 PM »

This should be a direct link. Hope it works.
http://www.smallflyingartsforum.com/yabbfiles/Attachments/Yvette.pdf
Posted here in relpy # 19 by Russ Lista ( Lister)?
http://www.smallflyingartsforum.com/YaBB.pl?num=1266539731/16#16
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Don McLellan
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« Reply #8 on: December 16, 2012, 01:30:30 PM »

Hi Davey,

Thanks for posting the links.  I was looking for the Yvette plan (on my computer) this summer and couldn't find.

Don
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« Reply #9 on: December 16, 2012, 05:44:41 PM »

Hi All,

I was so impressed with the Bill Brown designs. He posted a pusher he designed (photo), that for some reason did not fit into the category he had planned for it. I built it and flew it ragged in the field nearby. This got me interested in pushers and I built four or five of my own designs but none of them flew like his. We exchanged emails and he was my kind of person, unassuming and gentle- a great modeler- a quiet modeling genius.

I miss him like so many of you.

Outofbalance
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Re: Bill Brown's Spirit at USIC
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Dave Andreski
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« Reply #10 on: December 16, 2012, 06:14:50 PM »

Interesting Model like all Bill's designs are.
What's it called?
Thanks,
Dave
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« Reply #11 on: December 16, 2012, 06:57:51 PM »

Hi Dave,

I hope that outofbalance doesn't mind me answering .... it's the Bossy Bird.
There is a thread in the Bostonian section.

Russ Lister
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Dave Andreski
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« Reply #12 on: December 16, 2012, 07:04:39 PM »

Hi Dave,

I hope that outofbalance doesn't mind me answering .... it's the Bossy Bird.
There is a thread in the Bostonian section.

Russ Lister
Thanks Russ!
Got it on my pc.
Sorry about me being confused about spelling of your last name Embarrassed
Dave
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« Reply #13 on: December 16, 2012, 07:14:42 PM »

Dave,

No worries, you got it right ... RussLista is my SFA name, Lister is the proper spelling.
It's having a laugh with my local accent .... Leicester.
'Mister Lister from Leicester' is pronounced at best as 'Mista Lista from Lesta' with the local accent.  Roll Eyes
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« Reply #14 on: December 17, 2012, 10:37:48 AM »

Hi All,

Yes, Bossy Bird. I forgot to mention it. Thanks for the reminder. Great names he put on his designs.

Outofbalance
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Dave Andreski
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« Reply #15 on: December 19, 2012, 06:20:40 PM »

Hi Davey,

Thanks for posting the links.  I was looking for the Yvette plan (on my computer) this summer and couldn't find.

Don
Gosh Don,
I wish I'd have known you wanted it.
Dave
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Don McLellan
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« Reply #16 on: December 19, 2012, 06:32:01 PM »

Hi Dave,

My hard drive sort of semi crashed a while back and I lost some files; Yvette must have been one of them cause I couldn't find it.

Anyway, my assistant and I are currently in construction mode.

Don
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Re: Bill Brown's Spirit at USIC
Re: Bill Brown's Spirit at USIC
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Dave Andreski
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« Reply #17 on: December 19, 2012, 06:36:43 PM »

Don,
Your assistant is a real Doll!
You must be a very proud Grandpa.
Dave
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Don McLellan
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« Reply #18 on: December 19, 2012, 06:47:10 PM »

Hi Dave,

Cute maybe, but a real task master.  When I showed her this thread and some of Bill Brown's models, she immediately suggested we build an Yvette (...."with sparkely paper").

Don
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Dave Andreski
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« Reply #19 on: December 19, 2012, 07:02:14 PM »

Sparkely paper?
With your expertise at tissue printing I'm certain you'll make her happy.
Dave
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Don McLellan
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« Reply #20 on: December 21, 2012, 06:26:22 PM »

Hi Dave,

Yes, I hope so.  She's actually quite enthused about anything mechanical.

Construction and bones pics:
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Re: Bill Brown's Spirit at USIC
Re: Bill Brown's Spirit at USIC
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Dave Andreski
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« Reply #21 on: December 22, 2012, 05:53:26 PM »

Hi Dave,

Yes, I hope so.  She's actually quite enthused about anything mechanical.

Construction and bones pics:
Don,
Certainly looks that way. Hope she keeps that interest. Don't let her fall through the cracks.
Davey
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« Reply #22 on: January 09, 2013, 12:59:03 PM »

Hi Davey,

Sorry for the tardy response, but my assistant is just back from Christmas in Detroit.

If we manage a nice day in the next while, we'll give it a toss.  Note that it weighs a tonne (7+ grms) so it is an 'outdoor' Yvette.

Don
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Re: Bill Brown's Spirit at USIC
Re: Bill Brown's Spirit at USIC
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« Reply #23 on: January 10, 2013, 12:52:54 AM »

Don,

You have a very pretty assistant.  All my assistants are boys, she's precious!  Love the yvette!

Tom
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« Reply #24 on: January 10, 2013, 07:29:11 PM »

Bill B.
Mentored a lot of people and is mised by any one he ever toutched or talked to and he was a fantastic modeler
and designer and enginer ,It is a shame that God needed him to work on something upstairs so badly !?!?
 George
 
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