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Author Topic: BD5 - build  (Read 3474 times)
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tobgun
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« on: November 17, 2008, 06:01:55 PM »

Here is another,

it is a bit late for the build thread as the bones are almost completed. However, i though you might still be interested.

this is the second BD5 I am building, the first one flew surprisingly well despite the fact the fact that there is ahrdly any wing.

You can find pictures and flight videos of it on my website.


Attached are pictures of the current version. I have provisioned the structure with slots for optional landing gear. I want to se that plane taking off in Nijmwegen (hope it survives that long)
Attached files Thumbnail(s):
BD5 - build
BD5 - build
BD5 - build
BD5 - build
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tobgun
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« Reply #1 on: November 17, 2008, 06:08:22 PM »

Here is the previous one with a picture and video

http://www.schauggspace.de/Aircraft/movies/BV208_2.wmv

oops wrong video but still interesting

here is the right one

http://www.schauggspace.de/Aircraft/movies/bd-5-2.wmv


http://www.schauggspace.de/Aircraft/BD-5/DSCF2108.JPG

Looked lighter than the current one. Hope it will fly at least the same

Cheers, Tobias
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outofbalance
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« Reply #2 on: November 17, 2008, 07:18:46 PM »

Hi Tobgun

I recall when Bede was creating full scale kits for this airplane; no one believed it would fly on 40 hp.

Very nice model; what are the weight and ws?

I like the flying field with all that tall,soft grass.

Outofbalance
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skycafe
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« Reply #3 on: November 17, 2008, 07:54:50 PM »

That is really cool. Loved the video although the ring of trees made me nervous!

Is the peanut size, and where do you get plans?

robert
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lemuel
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« Reply #4 on: November 18, 2008, 01:41:39 AM »

another plane that i want to make!!! I am so in undated with planes that I want to make that I am having a hell of a time deciding which one I want to make. Good to hear that it flies well. I suspect with the higher wing loading it would handle wind a little better??? sounds like a good theory anyway. Keep up the good work tobias. I envy your build speed.

regards
Matthew
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albackstrom
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« Reply #5 on: November 18, 2008, 10:14:35 AM »

Good Videos Tobias. I am surprised that it flew that well with hardly and dihedral. I hope to hear of your new one soon.
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malc
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« Reply #6 on: November 18, 2008, 10:17:10 AM »

Wow, fantastic. Kind of spooky as I had just been looking at a BD5 site before I came to this this one. I built one of these from the same plan some time ago, could not get it to fly at all, so all credit to you! It eventually went home in a small matchbox...... Looked great though.... I had a plan to build another one with a blue foam fuz to capture the oval shape of the original fuselage. Oh well another unbuilt wish!

Tobgun, can you supply more details of the prop you used to get yours to fly so well? I suspect that some of the problems I had were due to the prop I used - I laminated the blades on a 100mm tube at 15deg to make a super light prop to save on nose weight, the blades were a bit 'paddle' shaped, which since reading threads on SFA about prop design is not the way to get best performance.

So whos going to make a 600mm span BD5J with rapier jet power then!!!?

Malc.
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malc
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« Reply #7 on: November 18, 2008, 10:27:13 AM »

Skycafe,

Check your PM

Malc.
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tobgun
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« Reply #8 on: November 21, 2008, 06:10:38 PM »

Dear all,

the BD5 is almost ready to go, just a few finishing touches are still required.

It is a small plane which really shortened the time required for covering and doping.

The weight of the structure is around 7g.

I am looking forward to the first flights but the weather is not on my side this weekend.

Best Regards, Tobias
Attached files Thumbnail(s):
Re: BD5 - build
Re: BD5 - build
Re: BD5 - build
Re: BD5 - build
Re: BD5 - build
Re: BD5 - build
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skycafe
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« Reply #9 on: November 21, 2008, 07:23:04 PM »

Malc, thank you. I just love this plane. I have always wanted a full-sized one, it is like a formula car. I think I remember seeing a model in one of Bill Hannan's books. I may not get it to fly, but heck, it is worth doing just to look at, as it has the 'zoom factor.'

Robert.
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lemuel
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« Reply #10 on: November 21, 2008, 10:09:55 PM »

Awesome plane tob... hope it flies as well as the first one.

regards
Matthew
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tobgun
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« Reply #11 on: December 01, 2008, 02:45:37 PM »

Hi all,

I managed to sneak to the field today for a few minutes of trimming flights. Sorry no time was left to grab the cam. This BD5 shows the very same behavior as the previos one. i
It is rather unstable on the vertical axis (not sure how to express this in the correct terms). It is changing from climb to dive very rapidly and frequently. I think it is a result of lacking incident of the tailplane and cg too far aft. Flights improved after adding noseweight but not yet to a point were I would like to have it. There is no stable balance in this configuration and controlled flights are only possible by using dynamic forces to keep the BD 5 on track. This might require a rather high flight speed and several trim tabs. A decent glide is not to be expected anyway..

Next flights will have to wait for the following weekend.

Best Regards, Tobias
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tobgun
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« Reply #12 on: December 07, 2008, 05:04:58 PM »

Hello here some impressions from the flight trimming. I will have to test a more efficient prop.

http://www.youtube.com/watch?v=QUXf4kZissw

Cheers, Tobias
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JetPlaneFlyer
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« Reply #13 on: December 08, 2008, 01:47:42 AM »

Tobias,
Could it use a little right thrust?

Steve
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malc
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« Reply #14 on: December 08, 2008, 08:16:08 AM »

Fantastic, it certainly looks promising. That porpoising seems typical of this type and is something I never could get rid of, the balance between stall and dive was so fine I could never get it right. What incidence between the tailplane and mainplane have you got?

Malc.
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outofbalance
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« Reply #15 on: December 09, 2008, 06:09:30 PM »

Hi Tobgun,

What a tough job you've taken on! Great starting flights! Kudos to you!

OOB
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tobgun
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« Reply #16 on: December 27, 2008, 05:37:47 PM »

Hello,

tried to do some fligts in rather cold and windy conditions. The BD5 is becoming more stable now. Flight times however still need to be increased. Got to work on the prop rubber combo.

http://www.youtube.com/watch?v=ShEIuE2ijTs

Best Regards, Tobias
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lemuel
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« Reply #17 on: December 27, 2008, 09:00:31 PM »

nice tobias. I have a question, is the model tail heavy? it does those diving actions that lookk very much like tail heavy or downthrust is needed. Keep up the good work tobias.

regards
Matthew
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tobgun
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« Reply #18 on: January 02, 2009, 04:36:40 PM »

Hi all,

got the trimming issues pretty much sorted. (If thats possible with this aircraft). Here is two decent flights. It would be great to get over 30 sec.

http://www.youtube.com/watch?v=QQQju5XHC6I

Best regards, Tobias
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BG
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Me with F1B - epic retrieval (flew 10km after DT)


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« Reply #19 on: January 03, 2009, 12:33:20 AM »

Looks good Tobias...if I may, it looks to me that you need more climb....I would try switching to a carved henn prop (maybe a bit bigger than the one you have (6 inch??)). The low pitch of a light henn prop should help get her climbing while keeping the rubber x-section the same...if the prop is lighter than your current one you might even be able to go with a slightly longer motor.

I make this suggestion because I have had very good luck with Henns, not because of any real aeronautical theory.
B
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F1B guy but its not my fault, Tony made me do it.
packardpursuit
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« Reply #20 on: January 24, 2009, 04:42:52 PM »

I like it! Looks great in the air. Keep at it and please keep us informed!
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crashcaley
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« Reply #21 on: July 12, 2009, 02:47:42 PM »

Tobias, That is really a cute model, and on top of it all, it really flys well. Way to go. It seems that you like to tackle some of the more challenging airframes.Always enjoy seeing your airplanes in the videos.

Caley
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What's stall speed?  Undecided
joshuadiode
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« Reply #22 on: September 06, 2019, 09:29:40 AM »

I just love the BD5 Model. Do we have anyone working on BD 5 out there
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