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Author Topic: The sub 400mg EZB plunge!  (Read 12864 times)
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ykleetx
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« Reply #125 on: January 23, 2016, 11:02:34 PM »

Don,

Start another thread called "the sub 250 mg EZB dunk!"

-Kang
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dslusarc
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« Reply #126 on: January 23, 2016, 11:23:34 PM »

Indeed! These are tiny wood sizes. I have your "Donna's Dragonfly" info for my guide. Herd is my stick and boom. Sucking blank 5.5" and 49mg, boom is 8" and 19mg. I am making this on a little shorter.
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Chris-DC5
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« Reply #127 on: January 26, 2016, 03:56:09 PM »

I love looking and reading about these fantastic light models,

I have managed to get my F1L models to the 1.2g limit but would love to have a go at a sub 1g EZB soon.

Thanks

Chris.
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cglynn
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« Reply #128 on: January 27, 2016, 10:35:09 AM »

Chris, sub 1g EZB is very doable.  If you haven't already done so, access the Hobby Shopper EZB article by Larry Coslick--http://www.indoorduration.com/INAVHobbyShopper.htm -- and faithfully follow the directions.  Build all of the jigs (the deflection jig will serve you for years to come) and use his wood sizes and weights.  Doing so will get you a 6-700mg EZB that will fly really, really well.  Best of all, true to its title, you can build a good EZB from hobby shop wood.  That said, if you have some nice indoor .008" C grain, it would be good for the prop.  If not, find a nice piece of 1mm and sand it down as per this article-- http://www.indoorduration.com/INAVEasyEZBProps.htm --

Build a few hobby shoppers and then check out Coslick's Micro B-- http://www.indoorduration.com/ftp/MicroBEZB.pdf --to build one under 500mg.  

Hope that helps, and have fun

Chris G
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dslusarc
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« Reply #129 on: February 02, 2016, 12:24:52 AM »

Getting closer to completion. Projected weight looks to be about 225 mg. This will be my only EZB at this weight I will try to build as these are simply ridiculous to make and not sure if worth the effort. Will see how it flies.
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dslusarc
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« Reply #130 on: February 05, 2016, 11:39:09 PM »

All finished. 229 mg. Will test fly next weekend.
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Olbill
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« Reply #131 on: February 06, 2016, 12:28:32 AM »

Impressive! I hope it does well.
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cglynn
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« Reply #132 on: February 06, 2016, 11:14:09 AM »

Don, that is unreal.  Very nice work.  Looking forward to seeing that one fly.

CG
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ykleetx
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« Reply #133 on: February 06, 2016, 11:37:20 AM »

Here's DDF at Lakehurst Labor Day weekend 2012 after its maiden flight.
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dslusarc
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« Reply #134 on: February 06, 2016, 02:05:40 PM »

I am really curious as if the wing is strong enough, at first I thought no but is seems the correct strength in proportion to the rest of it. I got a little sloppy with my white glue glue on the prop blades and probably could have saved 5 mg but I am just going to leave it for now. I want to see if in the Cat I gym if is has an obvious gain over my 320 mg model. The 320 g model can bump around and recover with no wing tucking. Not sure on this one. This was probably one of the hardest planes to build I have done in some time.
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ykleetx
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« Reply #135 on: February 06, 2016, 03:33:17 PM »

I made one Cat I flight under the 22' ceiling in Atlanta in 2012. It was something like 21:20. I had to back off on the torque because when the model dove, the flaring prop would tuck (I used a different prop) under the wing. Otherwise, the model recovered very well. It has 17% SSM.

I think my model can bang moderately around the ceiling without much worry. In Atlanta, the problem was that the model would hit the wall of the ceiling "recess" about 3' above the lower ceiling and crawl down the wall nose down. Once it cleared the wall, it would accelerate nose down before recovering, unless the prop tucked.
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dslusarc
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« Reply #136 on: February 06, 2016, 04:39:14 PM »

Good info to know. I went with 16% margin so essentially the same.
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adanjo
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« Reply #137 on: February 07, 2016, 03:13:54 AM »

(deleted by Aki, sorry)
« Last Edit: February 07, 2016, 03:27:38 AM by adanjo » Logged
dslusarc
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« Reply #138 on: February 15, 2016, 07:43:36 PM »

Well did some test flying yesterday. I was rather pleased. The wing is stronger than I thought but somehow I messed up my inner wing spars and they bow noticeably up near the tip than the other wing spars. I think I may have made an error in cutting them not compensating for the longer inner wingspan. I wound it up a little and it climbed out nicely. I am thinking of taking it to west Baden next month to air it out a little. I am also going to try one more wing to try and fix the bowing I have on the inner spars, the LE and TE both bow equally but it looks odd and I want to fix it. Watching this one fly I think a 200 mg EZB is doable. I may try one more extreme complete model to try and break the 200 mg barrier as I have some real good 3.2# motor stick and boom wood. I took some flight video and am in process of downloading if off my cell phone.     
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dslusarc
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« Reply #139 on: February 15, 2016, 11:56:09 PM »

Here is the video:
https://www.youtube.com/watch?v=A46IeleytTw

I just cut all the wood for "Absurdi-B" Mk 2

Don
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ykleetx
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« Reply #140 on: February 16, 2016, 12:07:13 AM »

That model flies incredibly well. I'm glad you're going for the 200 mg barrier.

-Kang
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Olbill
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« Reply #141 on: February 16, 2016, 12:33:43 AM »

That's beautiful Don!
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dslusarc
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« Reply #142 on: February 16, 2016, 09:12:20 PM »

Thanks guys. I have the new wing currently under construction on the bench right now. When this one is done I will have four EZBs, two in the 320 range, one at 228, and one at whatever this one comes out as. Hopefully one will do good for me.
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dslusarc
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« Reply #143 on: February 16, 2016, 10:33:01 PM »

New wing under construction.
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dslusarc
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« Reply #144 on: February 16, 2016, 11:35:09 PM »

Razor planed some 3.2# wood for my new prop.
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adanjo
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« Reply #145 on: February 17, 2016, 12:06:22 AM »

New wing under construction.

Is the toothpick a glue applicator?

Aki
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dslusarc
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« Reply #146 on: February 17, 2016, 12:37:18 AM »

Aki,

I use a thin wire for glue application. The tooth pick is for lifting the ribs up to the top of the wing spar before gluing.

Don
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dslusarc
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« Reply #147 on: February 17, 2016, 01:12:56 AM »

Stab under construction.
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green-man
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One of my F1D VP propeller hubs - weight 104 mg.



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« Reply #148 on: February 17, 2016, 06:44:43 PM »

Razor planed some 3.2# wood for my new prop.

Hi Don. Have you found any noticeable density increase by compression of the blade with the planed wood?
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dslusarc
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« Reply #149 on: February 17, 2016, 09:31:05 PM »

Not that I am aware of. I do soak the wood in water after planing to flatten it out so that may undo any compression. I can check these two sheets.   
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