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Old May 24, 2010, 12:57 PM
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AirmanAirhead's Avatar
Novato, CA
Joined Dec 2008
693 Posts
OK, that makes sense. Yes, it's been very windy here too. Now I have to go to work! Thanks for the input.

Jeff

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Originally Posted by Thanos View Post
Well Jeff,
again, in the water-planes section there are some specialists. From what I've read, whet it rests on floats, the water line should be something like the black line on my floats (previous photo). Also, there should be about 2 degrees incidence between the top of the floats and your wings. So, it could be incidence or maybe too much down thrust (although that should be OK if you have flown it without floats).
Keep on trying... and do let me know what happens. I'm still waiting for no wind (no pool for me here!!)
Thanos
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Old May 24, 2010, 01:50 PM
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Somebody has a setup for the 12inch version?
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Old May 24, 2010, 02:54 PM
treefinder
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SE MI
Joined Oct 2004
9,618 Posts
With the bm2410-08, and the 900mah packs it was about 15 minutes just floating around at partial throttle. With the emax cf28-22, and the 3s 1k pack (and the aileron wing) I get between 12 and 15 minutes if I'm doing serious flying, I think I got to 20 minutes with the UC wing and part throttle cruising round.
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Old May 25, 2010, 11:50 AM
In Rc for a LONG TIME FFAA#1
laserman's Avatar
Canada, ON, Ottawa
Joined Jun 2004
1,375 Posts
Hey gang

have been very busy with my life and not been able to get online due to fiances and job hunting but any ways spoke with tony over the long weekend and he is doing fine and is busy like a beaver with work. he hasn't even been able to get out to fly or do any designing but hopes to do so soon.
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Old May 25, 2010, 09:15 PM
If it flies, I will crash it
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USA, CO, Westminster
Joined Jan 2008
3,022 Posts
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Originally Posted by laserman View Post
have been very busy with my life and not been able to get online due to fiances and job hunting but any ways spoke with tony over the long weekend and he is doing fine and is busy like a beaver with work. he hasn't even been able to get out to fly or do any designing but hopes to do so soon.
Wow! It has been a while. Always nice to hear from you. Thanks for the Tony report as well. We are all confident that the work he is doing is very important and fortunately his design lives well on it's own.

Rob...
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Old May 26, 2010, 12:01 AM
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Joined May 2008
147 Posts
Bb32

Hello everyone glad to see such great projects come out of here. My first was a 42 then on to some other things. Then I built s 22BB. It flew ok but not what I had hoped for. Well, I am close to finishing a BB33 to hopefully that a friend can to learn to fly on.

So heres the stats:
Blue FFF
Hextronix 24 gram 1300kv motor, gws 8060 (I have a 9050 available)
2 cell lipo (20c 800 mah or 1300 mah)
3 channel - no aeilrons (yet) Throttle, Rudder, Elev

It currently weighs around 12oz w/ bat, motor, everything

I think it should fly with this motor prop battery

If anyone thinks different feel free to chime in

Just got finishing touchers and getting her to balance. I just wanted to get any final opinions before I start to glue everything together
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Old May 26, 2010, 03:43 AM
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Originally Posted by gadget74 View Post
Thanks Jack.. I had way to much deflection on rudder and elevator than.. even at 50% its way more than 6mm. I think I will redo some of the servo linkage and put them on other holes on the horn and readjust my TX (which is a pain in the current TX I'm using)... I have the hobbyking 6 channel TX on this one but I recently upgraded to the DX6i... just didnt put the RX in the blubaby..so I might change that too...

Maarten
Well Sunday I remaidened my blubaby with some success..

I reduced the deflections of the rudder and elevator to about 5mm and used the dual rated to het some bigger deflections. I strengthened the wing with a 6mm wooden dowel at the LE. and some ribs.

At takeof the BB didnt wat to lift of so I stopped... switched the Dual rate switch and took off. The I stalled the plane and crashed.. After removing some sand from the plane It took off without a problem. I made a few turns.. and landed. I was having some problems flying against the (very mild) wind.. it was soo slow so I reset the ESC and tried again. the second flight ended when the wing broke in two again now at the middle between the two dowels.. the damage wasnt all to bad. two small cracks in the fuselage and off course the broken wing..

blubaby maiden part II (5 min 39 sec)


On a dutch forum some people suggested a smaller battery and another prop so I've ordered some 2s500 and 3s500mAh and some other props to see if that increases the speed a bit.

I'm also going to build another BB with the KFm3 sports wing..

Would it be easy to change the fuse of this BB to put an KFm3 wing on it? I'm not sure how to find the right AOA for the wing..

Maarten
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Old May 26, 2010, 09:50 AM
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Tampa, FL
Joined Aug 2008
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Originally Posted by gadget74 View Post
On a dutch forum some people suggested a smaller battery and another prop so I've ordered some 2s500 and 3s500mAh and some other props to see if that increases the speed a bit.

I'm also going to build another BB with the KFm3 sports wing..

Would it be easy to change the fuse of this BB to put an KFm3 wing on it? I'm not sure how to find the right AOA for the wing.. Maarten
What motor, prop, esc, batteries are you using? I checked your previous posts and don't see any mention of them.

I made a simple foam center support piece that allows me to swap the UC wing and the kfm wing easily. For the kfm wing I cut the wing support parallel to the horizontal stabilizer. I think some of the plans may show this line, but I am not certain. After trying the kfm wing it did not float like I was looking for so I added a piece of foam at the front of the wing to lift it a bit. This increased the aoa and generated a slight bit more lift, but I still prefer the UC wing.
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Old May 26, 2010, 10:24 AM
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Originally Posted by chadr View Post
What motor, prop, esc, batteries are you using? I checked your previous posts and don't see any mention of them.

I made a simple foam center support piece that allows me to swap the UC wing and the kfm wing easily. For the kfm wing I cut the wing support parallel to the horizontal stabilizer. I think some of the plans may show this line, but I am not certain. After trying the kfm wing it did not float like I was looking for so I added a piece of foam at the front of the wing to lift it a bit. This increased the aoa and generated a slight bit more lift, but I still prefer the UC wing.
Hi Chadr,this is my setup:
HXM2730-1300 hexTronik 24gram Brushless Outrunn
TP_8x3.8 TP Slow Fly propeller 8x3.8
TR_P10A TURNIGY Plush 10amp 9gram Speed C
T1300.2S.20 Turnigy 1300mAh 2S 20C Lipo Pack
HXT500 HXT500 5g / .8kg / .10sec Micro Se

I measured the current after I crashed it and at full throttle it was about 4.7A.. the COG might be a bit too much forward as well.. I had too adjust the trim of the elevator way up too get it into the air.
I've ordered some stuff to measure the thrust and do some static testing of prop and motor.

Why do you prefer the UC wing? This is my first attempt at building and flying a plane.. but I quite like it this far..It's just that the wings I've build so far break too early.So I Thought that the KFm wings can be build stronger.. I also want to build in some aillerons. I understood that the UC doesnt like aillerons

Maarten
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Old May 26, 2010, 10:42 AM
treefinder
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SE MI
Joined Oct 2004
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Maarten: your equipment sounds just right for the 33" BB, but a wot at 4.7amp sounds low for that motor/prop/battery. I wonder if you have set the "full throttle" position for the esc? Usually it's turn on the tx, set throttle to full, plug battery into the esc, listen for a tone (differs with different brands) then pull throttle back to off. This tells the esc what a full throttle signal looks like. I have had several planes initially perform poorly, then remembered to reset, and they are now fine.

The UC wing is "floaty", will fly slow and easy to control. Ailerons probably will work if you want to fly the plane like a full size Cessna 172, i.e. only use them to bank into gentle turns. But most of us want to do axial rolls and all sorts of acrobatics when we add ailerons, and that won't happen with the uc wing. The kfm is more neutral and works really well with ailerons, but still has decent lift for long glides.
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Old May 26, 2010, 10:54 AM
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Tampa, FL
Joined Aug 2008
223 Posts
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Originally Posted by springer View Post
Maarten: your equipment sounds just right for the 33" BB, but a wot at 4.7amp sounds low for that motor/prop/battery. I wonder if you have set the "full throttle" position for the esc?
4.7 amps sounds perfect for a 2s battery with this motor.
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Old May 27, 2010, 01:16 AM
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Pretoria, South Africa
Joined May 2010
3 Posts
Hi all. Greetings from South Africa. After spending the last few weeks reading through this whole thread, I started building my building my BB42 with KFM3 wing this weekend. Am busy installing the electronics now. My problem: I bought a BM2409-12 motor which weighs in at a hefty 65 grams. Now I know this will cause the plane to be a bit nose heavy. For the motor to fit I either need to add about 1/2 an inch in front of the mono block, or just shorten the nose by that much (which might make it easier to correct the COG without adding too much weight at the back. What do you recommend?

Thanks,

Werner
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Old May 27, 2010, 02:23 AM
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Athens, Greece
Joined Apr 2009
165 Posts
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Originally Posted by XTX_fan View Post
Hi all. Greetings from South Africa. After spending the last few weeks reading through this whole thread, I started building my building my BB42 with KFM3 wing this weekend. Am busy installing the electronics now. My problem: I bought a BM2409-12 motor which weighs in at a hefty 65 grams. Now I know this will cause the plane to be a bit nose heavy. For the motor to fit I either need to add about 1/2 an inch in front of the mono block, or just shorten the nose by that much (which might make it easier to correct the COG without adding too much weight at the back. What do you recommend?

Thanks,

Werner
Hi Werner.
I had the same problem with my 42''. I used a 4mm plywood as firewall and still had to shorten the nose so that the prop could fit nicely. It does fly graet. Don't worry.
Good luck,
Thanos
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Old May 27, 2010, 04:57 AM
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Pretoria, South Africa
Joined May 2010
3 Posts
Thanks Thanos. That is the way I'll go then. Can not wait to get her airborn.
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Old May 27, 2010, 06:18 AM
Jack
USA, ME, Ellsworth
Joined May 2008
16,923 Posts
My BB 33 with the same motor balanced out nicely with the mass of the battery centered directly below the leading edge. So if you do not cut the battery box out, build to the plans, and decide the battery location as one of the last things you'll be fine.

I liked the battery on the bottom in a routed out cavity, that work fine for me and put it in a place that was otherwise unused and not crowded at all.

Jack
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