RE: Super Flying King twin-engined version  
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All Forums >> RC Airplanes >> Giant Scale Aircraft - 3D & Aerobatic >> RE: Super Flying King twin-engined version
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RE: Super Flying King twin-engined version - 6/6/2005 4:30:07 PM   
Bob757FL


 

Posts: 59
Joined: 8/7/2002
From: Fort Myers, FL, USA
Status: offline 		Oh my gosh Reg, I can't believe you did these tips yourself! I think Bruce's website says that the prefinished ones he does will save you about a day of sanding. After taking one look at the finished product, I figured it would save me 1 week of sanding. When they arrived, I knew right away that these were done well beyond my abilities right now. He uses a spindle sander I believe. Whatever that is, I don't have one or even know where to buy one. you did great on your own though.

Wheelpants on an ugly stick? Its supposed to be UGLY! I'll send you a picture of my ugliest of sticks. It consisted of a GP 60 size fuse and tail with a set of Dave Patrick Extra 330 wings that were permanently glued together with an aluminum joiner rod after the thing crashed. The wings are obviously way out of proportion but they were just too pretty and undamaged to throw away. It flew OK and got lots of laughs. If you can, send or post a pic of your 215 stick as it stands today. Thanks for the update!
Bob

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Bob

(in reply to fobus)
       Post #: 151

RE: Super Flying King twin-engined version - 7/9/2005 1:54:57 AM   
fobus



Posts: 89
Joined: 6/10/2003
From: Midwest City, OK, USA
Status: offline 		Bob,

Just a quick update. I have been installing radio gear in the SFK. I used 48" x 4-40 metal pushrods inside of .156 carbon fiber outer rods for the elevators. Bruce is concerned that the set up may reduce my effective radio range since I have run the antennas alongside the rods in the rear of the fuselage. Do you or anyone else have some opinions on the subject? I am using a dual receiver/battery setup for safety. I must resolve my current dilemma before moving on to covering.

Reg




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Reg Mason

(in reply to Bob757FL)
       Post #: 152

RE: Super Flying King twin-engined version - 7/9/2005 4:10:55 AM   
Bob757FL


 

Posts: 59
Joined: 8/7/2002
From: Fort Myers, FL, USA
Status: offline 		Reg, Your setup looks very similar to what we did with our single SFK. The only differences are that the the elevator outer tubes were fastened on every 1/2" balsa side stick that it crossed to absolutely insure against buckling and the inner control rod was the plastic one with metal ends screwed in. The reciever antennas were routed along guide tubes, one each side right next to it. I will try to email or post you a picture here so you can see how it was. There were no radio range problems. You might want to setup a reciever and do a range check before covering just to make sure the metal pushrods don´t present a problem. Walk down to the end of your street and see how it performs with a few servos.
Bob

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Bob

(in reply to fobus)
       Post #: 153

RE: Super Flying King twin-engined version - 8/31/2005 3:00:10 AM   
fobus



Posts: 89
Joined: 6/10/2003
From: Midwest City, OK, USA
Status: offline 		Bob,

Just a quick note to let you know that I am still at it. My deadline of July 31st has turned out to be my biggest embarassment. My new deadline is "it will be done when it is done"! Maybe I won't miss this one. Below are a couple of pics showing my status. Fowler flaps are not installed and outer wing panels are missing. It should be flying by October.

Reg



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Reg Mason

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       Post #: 154

RE: Super Flying King twin-engined version - 8/31/2005 3:15:23 AM   
mstroh3961



Posts: 1823
Joined: 8/22/2002
From: Evans, CO, USA
Status: offline 		Looking good Reg! now get er done!


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Regards
Mark

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       Post #: 155

RE: Super Flying King twin-engined version - 8/31/2005 3:22:57 AM   
Bob757FL


 

Posts: 59
Joined: 8/7/2002
From: Fort Myers, FL, USA
Status: offline 		Hi Reg,
Thanks for the update once again! It is looking better with every update. October? I don't know, 2 engines to get mounted and hooked up plus flaps, windows, control setup, and balance. That might be pushing it. December sounds more realistic if your weather is acceptable. Even the foamies take me 2 weeks anymore even though they are always advertised at an evening or two! Keep up the good work and keep the updates coming!
Bob

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Bob

(in reply to mstroh3961)
       Post #: 156

RE: Super Flying King twin-engined version - 8/31/2005 10:50:28 AM   
fobus



Posts: 89
Joined: 6/10/2003
From: Midwest City, OK, USA
Status: offline 		Bob,

Engines only require 4 bolts. Throttle servos and linkages are in place, as is all of the fuel plumbing. The flaps only need to be covered. Flap servos are already installed. All the radio gear: two receivers, elevator and rudder servos and pushrods are in place. I still need to cover the custom round cowls. With all that said, you are probably right. December it is.

Reg

Two weeks for a foamie. I am impressed!


By the way, the two pics I posted were number 662 and 663. This build is well documented.


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Reg Mason

(in reply to Bob757FL)
       Post #: 157

RE: Super Flying King twin-engined version - 9/27/2005 5:57:36 PM   
Staudruck


 

Posts: 18
Joined: 8/29/2003
From: Concepcion, CHILE
Status: offline 		Hello everybody,

My name is Frank and I´m new in this forum. We are interested to build a Twin-SFK for our research activities on autopilot development (university research project).
How long would you expect will it take to build a SFK for an experienced RC-model builder that is dedicated 100% to the SFK? My idea is to hire someone especially for that job.
Does someone yet know the level of vibration induced by two G38 (or similar) and how to reduce them? Are there fuel-motors that produce less vibration?

Thank you very much

Frank ("Staudruck" means dynamic pressure in german)

(in reply to fobus)
       Post #: 158

RE: Super Flying King twin-engined version - 9/28/2005 6:43:33 AM   
fobus



Posts: 89
Joined: 6/10/2003
From: Midwest City, OK, USA
Status: offline 		Staudruck,

I can let you know about the two G38s in about two weeks time. As for the build time, pay no attention to the time it took me. I am the world's slowest builder and while building the SFK, I built a couple of other airplanes. A 100% dedicated builder should take no more than a couple of months to complete an SFK. It should be a great platform for research.

Bob, Mike and the others,

I am down to covering the cowls and installing the window panes. I got sidetracked by a 30% Carden CAP 232 with a 3W75 that I bought off RCU. I will post a picture as soon as the King is in the A-frame being balanced.

Reg


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Reg Mason

(in reply to Staudruck)
       Post #: 159

RE: Super Flying King twin-engined version - 9/28/2005 10:08:42 PM   
Staudruck


 

Posts: 18
Joined: 8/29/2003
From: Concepcion, CHILE
Status: offline 		Fobus,

thanks for the reply...

I printed the foto you posted, where the SFK is shown completely on a Ping-Pong table, and pinned it on the wall of my office to prepare me for whats comeing on. The dimensions of the SFK are really impessing!!!

I need to know some more details about the SFK:
- what do you (or anybody else who built a SFK) expect to be the max. Payload of the SFK?
- how much fuel does the SFK consume in normal flight?
- how much nose weight do yo need to trim the twin-SFK?
- what do you do to avoid RF-interference problems on the long servo leads that go to the aileron servos?
- are both motors RPM-syncronized or do you control them independently?
- would you recommend Zenoah motors for a flight mission of about 1 hour (or even more)? Are they reliable enough?
- does the magneto system of the Zenoah´s generate any interference trouble?
- are there any fuel-motors that support an electric generator to produce enough energy for the board systems?

As I told you in my first post, we are planning to use the SFK in order to have a research platform for autopilot optimization. The idea is to have an airplane that is capable of lifting a lot of payload (infrared-camara, data transmission, autopilot, batteries ...) and a lot of fuel to stay airborne for a couple of hours. The motivation of the project is to develop an own autopilot system for UAV flight-control for civil applications. We are collaborating with a local aircraft company (that builds real aircraft), so our new aircraft will be certified for autonomous operation. We need the SFK as a technology demonstrator, to get people interested in what we are developing.
I think we will start our project before end of the year and I would be glad to receive hints and tips from the experts that have yet built a SFK. Of course I will maintain you informed about our activities and advances, once we´ve started to build our first SFK (I think we´ll make several).

Thanks a lot. I love this thread, so I will stay tuned.

Frank

(in reply to fobus)
       Post #: 160

RE: Super Flying King twin-engined version - 10/1/2005 4:59:51 PM   
BruceTharpe


 

Posts: 337
Joined: 11/29/2003
From: Rogue River, OR, USA
Status: offline 		Frank, I've been out of town for a couple days, so I haven't seen your questions until now. I invite you to write an email to me at bruce@btemodels.com so we can discuss your project off line.

Concerning your first question about payload, my guess is it that it wouldn't even breathe hard with ten pounds of payload. Twenty pounds should be very manageable with careful piloting. More than that and I'd consider some beefing up in certain areas. The fuselage is a huge box and it could probably haul your equipment internally.

As long as I'm here, I should mention that SFK kits are currently out of stock. A new batch is in the works and should be ready to ship by the end of October.

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www.btemodels.com

(in reply to Staudruck)
       Post #: 161

RE: Super Flying King twin-engined version - 10/4/2005 1:46:52 PM   
RCSHOWCASE


 

Posts: 163
Joined: 4/9/2002
From: Waldorf, MD, USA
Status: offline 		Finally!

Sunday Oct 02, 2005: First flight of my (David Garrison's) twin Super Flying King! Long time in coming but well worth the wait. She flew perfectly...take off roll at 1/3 throttle was about 100 feet (no flaps).

Andy Kane was the test pilot and managed to do : loops, spins, knife edge passes, one half a rolling circle, tried a torque roll but only managed to hang her on the props for awhile; (any one know if it is possible to troque roll a twin?) The SFK twin flies like a (big) **** cat but is capable of doing alot more! See pics below. Andy also flew it in formation with an airliner coming in for a landing at Dulles International.

Those twin large gas engines sounded WONDERFUL!

The DCRC club members voted the SFK Twin "a KEEPER!"

Specs of SFK twin as built:

41.5 pounds (1.5 pounds lead weigh in nose to balance at CG)
2 ea ZDZ 40 RV gas engines , with 16 ounce tanks
Radio System used is the Multiplex Royal EV0 12


David Garrison
RC Showcase

Big is good, but Bigger is Better!




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big is good, bigger is better!

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       Post #: 162

RE: Super Flying King twin-engined version - 10/4/2005 1:56:45 PM