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Old Oct 02, 2007, 09:12 PM
I'm not flying backwards!
Tony65x55's Avatar
Oshawa, Canada
Joined Sep 2004
3,753 Posts
Quote:
Originally Posted by paulo810
I did not have any FFF but I do have plenty of Dow Styrofoam ( 2" thick, 4' x 8' sheet ).

Here's my pre-maiden rendition of the baby. Specs to follow.
Paulo, that a good looking BB. When is the maiden?

Tony
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Old Oct 02, 2007, 09:14 PM
I make this look hard!!!!
Greenville, WI
Joined Jan 2007
70 Posts
Very cool Paulo. I have a piece of the pink Owens version in the basement. I may have to experiment with shaping it. I dont have a hotwire (and no knowledge of how to make one), so I may dig around the woodworking tools and see if there isnt something there that would work.

Gary
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Old Oct 02, 2007, 09:32 PM
"On the Wing"
paulo810's Avatar
Ohio
Joined Jul 2006
757 Posts
Thanks Tony, for the compliment and of course - the plan. Maiden looks like Thursday A.M. according to current weather forcast. Rain & 10 to 20 mph winds tomorrow.

Gary, there is a ton of info on hot wire here. Just don't get distracted by people who get way too into building the uber-cutter. It's really very simple.

The pink foam is good (except it's PINK) and appears to be somewhat brittle but I have used it on some light micros with great results.

Blue is fantastic to work and fly with, can take a lot of punishment too.
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Old Oct 02, 2007, 11:55 PM
Always Ready!
warhead_71's Avatar
Chicago, IL
Joined Dec 2006
5,077 Posts
I'm looking to improve my own flight time on my 48" KFBB. Currently I'm getting about 12-15 minutes of flight time, but I feel that my motor/prop combo isn't right for this size of plane.

Wing = 48"x11.5" KF airfoil.
Weight w/BP21:GWS8040, 18aESC, AR6000 RX, (3x) 9gr servos = 17.5oz
Battery = 1200mah 11.1V 12C Lipo = 3.5oz
AUW 21oz*

Avialable motors:
BP2408-21*
BP2409-12delta
BP2410-08star
Esskay400XT
Frio10 (1050kv)
emax CF2822

Available Lipos:
(2x) 1200mah 11.1V 12C = 3.5oz*
(2x) 1500mah 11.1v 15c = 3.25oz ea.
(1x) 2250mah 11.1v 20c = 6.05oz
(1x) 2250mah 7.4v ?c = 4.25oz
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Old Oct 03, 2007, 01:36 AM
Registered Aircraft Offender
Truglodite's Avatar
Carmichael, CA
Joined Feb 2007
3,449 Posts
i'm familiar with the bp motors, but not the other's that you have. i think the bp21 is a good fit for your plane. if a bp21 has enough power for my bbap1 60" to do loops, climb 30-40deg, and fly 20min minimum, then a bp21 has got to be enough power for your bb48". to improve time you could shave weight wherever possible and maybe use a bigger lipo. at 21oz auw with your electronics, your airframe is on the heavier side, but that shouldn't be a big problem as many ppl find the bb flies fine with added weight. in fact many ppl find that bigger batteries have little negative effect a bb's performance, so they use them for longer flight times. i don't think it would hurt to try the 1500, or maybe even the 3 cell 2250 with an 8x4. you could also see if you get better results with the 2s2250 and a 9x4.7.

i'd just go out & have fun flying with the different packs. just don't have so much fun that you forget to jot down some notes.

kev

[edit: looks like you already got rid of the heavy landing gear. i know it would hurt the looks of your bb, but flying without that oil can cowl would probably save you a bunch of weight. it doesn't take too long to make a cowl from fff, which would be almost weightless. you can also sand & paint it to suit your taste.]
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Last edited by Truglodite; Oct 03, 2007 at 01:43 AM.
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Old Oct 03, 2007, 06:36 AM
I'm not flying backwards!
Tony65x55's Avatar
Oshawa, Canada
Joined Sep 2004
3,753 Posts
Quote:
Originally Posted by paulo810
Thanks Tony, for the compliment and of course - the plan. Maiden looks like Thursday A.M. according to current weather forcast. Rain & 10 to 20 mph winds tomorrow.

Gary, there is a ton of info on hot wire here. Just don't get distracted by people who get way too into building the uber-cutter. It's really very simple.

The pink foam is good (except it's PINK) and appears to be somewhat brittle but I have used it on some light micros with great results.

Blue is fantastic to work and fly with, can take a lot of punishment too.
Blue is my choice for monoblocs because it has a little give and shapes and sands well. The pink is slightly better for shaping and sanding and weighs a tiny bit less. It is more stiff and brittle than the blue but here in Kanuckistan we have a hard time lately getting the blue stuff so most of my monoblocs are done with the pink. It works well for this purpose as it is sandwiched between the blu core and that takes the brittleness out to a great degree. Either one is way better than the white bead foam,

Tony
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Old Oct 03, 2007, 06:39 AM
Registered User
Joined Aug 2006
170 Posts
Tip plates -

Is there a preferred profile for a tip plate? I've looked at some of the photos on the site and the wings with plates seem to have differing shapes.

Thanks again. Always lots to learn.

elight50
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Old Oct 03, 2007, 06:44 AM
Flying 3 mistakes high
GlennS's Avatar
Melbourne, Australia
Joined Jun 2004
1,522 Posts
Hi Tony,

Is the LG on the BBPAP2 full drawing is to scale? Have made some LG that is a bit bigger and it looks a little silly.

Cheers,
Glenn.
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Old Oct 03, 2007, 06:52 AM
I'm not flying backwards!
Tony65x55's Avatar
Oshawa, Canada
Joined Sep 2004
3,753 Posts
Quote:
Originally Posted by warhead_71
I'm looking to improve my own flight time on my 48" KFBB. Currently I'm getting about 12-15 minutes of flight time, but I feel that my motor/prop combo isn't right for this size of plane.

Wing = 48"x11.5" KF airfoil.
Weight w/BP21:GWS8040, 18aESC, AR6000 RX, (3x) 9gr servos = 17.5oz
Battery = 1200mah 11.1V 12C Lipo = 3.5oz
AUW 21oz*

Avialable motors:
BP2408-21*
BP2409-12delta
BP2410-08star
Esskay400XT
Frio10 (1050kv)
emax CF2822

Available Lipos:
(2x) 1200mah 11.1V 12C = 3.5oz*
(2x) 1500mah 11.1v 15c = 3.25oz ea.
(1x) 2250mah 11.1v 20c = 6.05oz
(1x) 2250mah 7.4v ?c = 4.25oz
If you're looking for long flight times the BP2410-08star with the 2250mah 3s seems like the stand out choice. It's pretty efficient with the GWS 9047 prop and has more than enough power to throttle it way down for extended cruising. My $.02 but as I've repeatedly said, I am a motor idiot.

Tony
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Old Oct 03, 2007, 07:09 AM
I'm not flying backwards!
Tony65x55's Avatar
Oshawa, Canada
Joined Sep 2004
3,753 Posts
Quote:
Originally Posted by elight50
Tip plates -

Is there a preferred profile for a tip plate? I've looked at some of the photos on the site and the wings with plates seem to have differing shapes.

Thanks again. Always lots to learn.

elight50
This is the profile I prefer. it has enough area to control the vortex around the wing tip but not so much as to make unnecessary drag. The winglet styles you see on jetliners and other are tuned to maximize efficiency at cruise speed for fuel savings. Obviously they work well but require a lot of R&D to tune them.

Tony
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Old Oct 03, 2007, 07:13 AM
I'm not flying backwards!
Tony65x55's Avatar
Oshawa, Canada
Joined Sep 2004
3,753 Posts
Quote:
Originally Posted by GlennS
Hi Tony,

Is the LG on the BBPAP2 full drawing is to scale? Have made some LG that is a bit bigger and it looks a little silly.

Cheers,
Glenn.
Hi Glenn, yes it is to scale on the original plans but the PDF of the whole aircraft is not the same scale as the tiled plans. It is there for reference so the parts can be fitted in the right places. I took a look on the tiled plans and I see the LG are not on them. Mucho sorry, here is a PDF of the correct LG.

Tony
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Old Oct 03, 2007, 07:25 AM
Flying 3 mistakes high
GlennS's Avatar
Melbourne, Australia
Joined Jun 2004
1,522 Posts
Thanks a lot Tony!! The set I made stands the aircraft up a little high.
Hope to get it in the air on the weekend.
Thanks again...
Glenn.
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Old Oct 03, 2007, 07:32 AM
I'm not flying backwards!
Tony65x55's Avatar
Oshawa, Canada
Joined Sep 2004
3,753 Posts
Quote:
Originally Posted by GlennS
Thanks a lot Tony!! The set I made stands the aircraft up a little high.
Hope to get it in the air on the weekend.
Thanks again...
Glenn.
A little high isn't going to hurt anything Glenn, just give you more prop and camera clearance. Just remember to advance your throttle gradually rather than punching it, the tail will come up and she'll track fine. Looking forward to your maiden report this weekend. Good luck with the weather!

Tony
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Old Oct 03, 2007, 07:36 AM
Flying 3 mistakes high
GlennS's Avatar
Melbourne, Australia
Joined Jun 2004
1,522 Posts
The weather has been a bit of a problem here lately, lots of wind! Hoping for a calm saturday.
I was wondering about stiffening up the vertical stab with some small CF tube, it is a just a little floppy... maybe its nothing to worry about. Maybe some tape will make a difference.
Cheers,
Glenn.
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Old Oct 03, 2007, 07:53 AM
I'm not flying backwards!
Tony65x55's Avatar
Oshawa, Canada
Joined Sep 2004
3,753 Posts
I haven't had any issues with mine although mine was built with FFF. I assume your is depron and it's a little more flexy. I'd go with the tape before the CF tube though.
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