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Old May 17, 2009, 02:41 PM
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Bullseye Delta, RET w/no dihedral delta-- the finest RET Delta w/ Video

Got a new plane in the air yesterday. It is a hybrid between my Nutball Delta and Glen's Bullseye. I will try to get some video in the next week. Perfect slow flier. Speeds right along. Should handle winds or calm. Absolutely NO DIHEDRALyet it turns, loops, rolls just fine. It also flies inverted. Hobby-Lobby foam core with paper removed and painted with Krylon H20 Yellow. Spars are bamboo slats out of a roman shade because it was available to use. The hole is the same shape centered and one third the size CG about at the LE edge of the hole. Doubler is used. I had originally planned to use this frame as a replacement 4ch NBD before I revised the plan and had cut a 40%doubler for the bottom. However, I put it on top to simulate the S curve of the original Bullseye. You can also see the little triangles in the corners of the TE that hot hot glued back in solid (in case that looks confusing) that I had intended for tailerons for the 4ch model.

Glens' Bullseye thread: http://www.rcgroups.com/forums/showthread.php?t=77455

My Nutball Delta thread: http://www.rcgroups.com/forums/showthread.php?t=893481

Plans used was this. http://www.rcgroups.com/forums/showp...2&postcount=71 I shrunk them again to one third the full size and centered for the bullseye hole.

Specs:

Length: 20"
WS 18.5"
Rewound Turnigy 2730 by Dave North 16.+oz thrust on 2s with GWS 8040 1900+Kv
hextronik 10A esc
hextronik 5g servos
berg4l

Airframe weight 158g (no battery)
AUW with ABF 900mAh battery 208g (7.4oz)

CG for all models is about 28% or so of the chord. The front of the hole is a good place to start. Adjust to suit your taste and conditions.

Bullseye Delta 7 31 10 (4 min 32 sec)


15" WS 6mm EPP Version 116g AUW w/ 240mAh 2s 2204-14t 5g servos 7035prop 2.4g rx

6mm EPP Bullseye Delta.wmv (5 min 38 sec)


Bullseye Delta indoor landing skid and walk around (3 min 13 sec)
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Last edited by tymbrewolf; Feb 27, 2011 at 08:09 PM.
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Old May 17, 2009, 04:14 PM
gpw
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Got plans ???
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Old May 17, 2009, 04:36 PM
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Well, actually the plans are on the Nutball delta thread post #1 except for the center cut. I just used them and shrunk them down until they were 1/3 for the hole and centered it. Unlike the plans though, I have increased the 20" size control surfaces on the model shown to 3 1/2 inches instead of 3.

Also plans for the NBD drawn by Gene Bond for me.
http://www.rcgroups.com/forums/showp...2&postcount=71
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Last edited by tymbrewolf; May 17, 2009 at 05:17 PM. Reason: added Gene Bond's plans for my NBD
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Old May 17, 2009, 04:44 PM
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What benifits is there cutting a hole in the middle?
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Old May 17, 2009, 04:51 PM
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Well, that would be discussed in the Bullseye thread to some extent. Perhaps it is a pressure relief valve that helps allow it turn with out tips on RET. Perhaps Glen could fill in the reason for it. I merely modified one of his seeminly partially forgotten well flying designs to a delta. It works very well. I can't answer that, just know it works.
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Old May 17, 2009, 06:30 PM
gpw
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Dean , I defer to the Lee-Richards annular wing planes ... http://www.internetmodeler.com/2006/...e-Richards.php
It has been written ,that the hole makes the wing behave more like a tandem or JWA ...
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Old May 17, 2009, 06:59 PM
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BTW, some other disk aircraft although mine is a delta.

http://discaircraft.greyfalcon.us/Wo...evelopment.htm
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Old May 17, 2009, 11:20 PM
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I was planning to borrow my daughter's nice digital camera for the week for some video. However, she took it home with her. Looks like I can practice some inverted RET before I might get to document the fun you can have.
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Old May 18, 2009, 02:51 AM
flyin' fool
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Quote:
Originally Posted by tymbrewolf
BTW, some other disk aircraft although mine is a delta.

http://discaircraft.greyfalcon.us/Wo...evelopment.htm
I think I now know where the inspiration comes from for some of the foam contraptions that have showed up at our field.

No, it's not that site on disc machines and it's not imagination, it's gotta be the BC Bud.
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Old May 18, 2009, 07:53 AM
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Frank, had to google your comment. I didn't know cannabis and RC flying went together. To each his own I guess. I lean more to the conservative side of thngs.
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Old May 18, 2009, 09:41 AM
gpw
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From the looks of those old planes , seems like nothing is New eh ??? We're just re-inventing the Foamie wheel ...hahahaha
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Old May 20, 2009, 10:44 PM
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Lumifly FAA lighting system from HC on the plane.

Poor video: http://www.rcgroups.com/forums/showt...4#post12285790
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Old May 23, 2009, 10:44 AM
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Two batteries thru this morning. Perfect and calm. I still get so confused inverted with a rudder. I like this challenge. So easy to fly.
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Old Jun 11, 2009, 07:37 PM
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Continues to be about the only plane I fly. Now that I can fly at dusk with the lights, it is great in close and fast on the wing. I am going to try another soon with another motor so I can do 16oz on 2s 9x5 and 22oz thrust on 3s on a 8x4 ion a Dave north motrofly 2205 rewind. I did lose my rudder a few days ago trying to fly in 15+ gusts. I was floating near the ground and a gust caught it in a turn and it got pile drived in the ground and cracked the vert stab. HG and I added a little half bamboo skewer up the side for more support.
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Old Jun 12, 2009, 07:11 AM
gpw
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Very Cool !!! Mind that wind !!! hahahahaha
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