LipoPilot

Well boyz and girlz it's over finally, not that I didn't enjoy making the Brewster, doing it in video was work. From here on out this post will be videos, improvements, and questions from those who like the Buffalo Brewster. I truelly enjoyed it, now to my next design.

Thanks everyone.

Final video for the build of the Brewster 9mm Combat Fighter

[media]http://www.youtube.com/watch?v=VRoNjGRXLEQ[/media]

Lets build one and fly...

Court461

Thanks for taking the time to shoot the videos and post the plans. As requested on Twitter, here are some pics of my build so far. I decided to try one from blucore first, but may make one from EPP later. As the blucore was a little thin, I laminated two sheets together to approximate 9mm. Here she is so far, if my 1 yo will take a nap today I am hoping to finish up before this weekend.

LipoPilot

Very nice and thanks for posting I always like to see the Brewsters that are built. Have you decided on colors yet? Funny about thr 1yo...my 2yo adds a couple days to every build lol.

Court461

Not yet, but I am gonna fly it before I do too much paint work, in case my first flight results in the big crash. That way I won't feel as bad.

Court461

Well here is the finished product (less paint of course), didn't get the maiden today, but hoping tomorrow. Set up is BP-21 motor, CC25 esc, and HXT servos with an AR6100. Had the motor and esc is why I used those, I have that identical power setup on my e-starter and it works pretty good. Hope to get some video.

smokejohnson

Looks good...can we expect to see it out at the Bald Eagle club Saturday?

Court461

I hope so, my wife is a nurse and is on call Friday night, as long as she gets some sleep, I will make it. If she is up all night I will be taking care of my daughter. Hopefully not many people get hurt tomorrow night!

smokejohnson

LOL, well I hope to see ya there .

LipoPilot

Clicking my heels..nobody get hurt..nobody get hurt...nobody get hurt.

Wrench66

Another Brewster F2A Buffalo is on the build table
I'm using 9mm Depron except for the tail which is 6mm, this one will be a pre-WW2 trainer colored in the USAAC motif.
Powertrain plans are for a 120W outrunner, 8" prop and 1000mah battery.

Thanks for the plans, 'Pilot!

--Ray

LipoPilot

Yikes 120 watts LoL, you will like it with that motor it rocks, Cant wait to see some flights. I like the paint scheme too, you will need to see it at that speed.

Wrench66

Aw, 120W is pretty tame around these parts (10V x 12A=120W)...LOL, heck your lil' French Flyer has potentially a 200W motor!

The bare airframe is completed and even has most of her markings at this point. I'm tired, more tomorrow eve (maybe a Mon morn maiden! say that 3 times fast).

She's 3oz as it sits, should be able slide under the 12oz mark AUW.

--Ray

Wrench66

Another Brewster hits the air, xlnt flying plane, Lipo, thanks! I initially put her up with a 500mah 3s, then changed to a 1000mah 3s and she flew just as good with even a bit more power (prolly holding it's voltage better then the little pack). AUW came in just under 12oz...and power from the Emaxx 2822 with an 8x4 gws prop is 113w, with an 8x6 gws it just topped my 120w target and it's fast!

I am processing the video now and will post later today.

Meanwhile, please enjoy the post-maiden pics as she sits cooling off and being debriefed after her first flight(s).......

--Ray

LipoPilot

Very NICE!!! Gonna make me take a Brewster out today, can't wait to see the video.

Wrench66

Hehe, you should! I'm seriously considering cutting a rudder into her tail, just so I can trim out a bit of port yaw that I am dealing with. Hmmm, that's a simple fix. Did you have any of this attitude with your builds , Lipo?

Here's the video

--Ray

[media]http://www.youtube.com/watch?v=UohlIugucog[/media]

Brner

Nice looking ship and very nice video Ray....glad to see people getting some use out of the plans.

Question for you....I notice you made a couple of revisions to the plan, some added braces mostly. But do I see some down thrust on that motor stick, or are my eyes deceiving me?? I talked to LP about adding some to the original plan but he wasn't sure it was necessary. Also would a little right thrust help that yaw problem?

Again, great looking job on that Buffalo,

Don

Wrench66

Thanks Don,

I didn't include any downthrust in my build, although maybe the pics are distorted a bit?
The two extra carbon braces were mainly for insurance since I do tend to overpower things sometimes :o.
When she is flying away from me, the fuse is trying to slowly turn left (ailerons trimmed for level flight, lateral balance is spot on) to where it would make a big flat circle if left alone. Seems funny since I have a carbon spar running 85% of the fuse length to counter any warp in the Depron......strange huh? Further insight shows that with a straight edge laid against the fuse I see no bowing UNTIL the rudder/v.stab area where I do have a slight variation from flat......bowing left. Not surprisingly this bow starts directly aft of where I sunk the carbon spar's initial beginning.

A simple fix for a great flyer all around.

--Ray

gramps2361

Wrench nice looking brewster video is great and the flying is to.
I have a brewster grave yard going in the gararge 3 of em spare parts. Just not ready to fly this with out dorking it in have fun doing it though.
Thankfuly quick and easy to cut some assembly required.

Wrench66

Thanks Gramps

Keep at it, she's a real responsive girl and will settle and fly right once she knows you're serious...LOL

I am very happy with the outcome and I like the way it will just poke around at approx 1/2thr. I do like a smooth flying plane.

--Ray

LipoPilot

Very very cool...nice to see one fly and its not me, I cant say how cool this is. As far as down thrust never seen any outragous climb to put this im my plans. As far as fuse spars, they are not in the plan but my build videos does show me installing. I figured I would let the Brewster float around and get more pilots flying them before any real plan changes are made...you know what they say two brians is better then one. Really nice work Wrench....

Wrench66

Thanks again

I wasn't overly concerned with it before, but the more I worked on the plane the more I started wondering about how much "cord" the fuse has.....she's a thick girl (just my style..LOL).
Now with a rudder, I would bet that fuse would be more than willing to knife edge all day long.....ya dig? I'm no 3D maven, but I bet I could do it.

Hehe, just dreamin.......I do need to resolve that yaw though

Definitely does not have any thrust issues.....I could go from floating around to wide open without noticing any pitch variances.

later,
--Ray

Alpea42

Nice build and video Ray.

LipoPilot

You know how it goes the maker can tell you all kinds of stuff, but honestly he doesnt know it all, so Im open for new developements in the BB, I never installed a rudder it was to much fun as a pole racer lol. Been awhile since i tossed a brewster got to get me one out now. Don is watching and can make changes as we go, but it sounds like the thrust is not there on yours too, good news. I'm just glad someone else sees its really a neato flyer, will slow to a crawl and zoom like a rocket. Knife edge in a Brewster would be a sight but not sure I want to see people 3D flying in this cool warbird...I've see worse lol. The Brewster is made to run in wide open spaces, although I am passing out some 5mm slowflyer BB's to some hover folks for testing. Not because of there 3D flight abilities but because there flying indoors. A 5mm depron, 2226 1800 outrunner 7.4 lipo 8.3 prop would be real nice inside and about 7 to 9 oz. Brewster would be cool inside...

Wrench66

Brewster debriefing reports....Flight #3,4 & 5.

OK, surgically cut a rudder into her fuse last night and added a small 5gr servo directly over the existing elevator servo. I went with the small servo to save as much weight shifting as possible.....since my CG was spot-on in the orig configuration.
Flight #3 consisted of fighting the trims initially (yaw, pitch AND roll! oy) and then finally settling down to experiment with the new rudder control.
Upon trimming the roll and pitch to neutral (still not sure what changed from the maiden to today's run....hmmmm, balance in both axises remained well intact after the recent rudder mods) I could get her to fly quite straight away from me by holding a few degrees right rudder. OK, set the trim to hold the most stable settings and we had success!
I then brought her in to note where the control surfaces were in relation to their neutral settings for further use.......I really don't want to have to trim everything every time I fly her, that's what maiden's are for right?? LOL.
The post flight check revealed a normal amount of aileron and horz stab deflections....just perceptible from dead flat....the rudder, however had much more than the normal deflection to the right (countering a left yaw) resulting in me scratching my head wonderin why?! hehe (see pics below)
All my double checks of wing to stab and wing and tail to vert stab have all revealed a perfectly "straight" plane. Another quick check of wing tip to tail tip confirmed all is well. The fuse itself is just as straight.....strange!
I have two other flat foamies that are WELL battle worn and do NOT check out nearly as well as the Buffalo does, yet they both are xlnt flyers with more than their share of batteries put through them and do not ask for any odd trimmings to fly correctly......even though I wouldn't be shocked if they did! LOL
One plus in flying the Brewster is that the rudder is VERY authoritative, allowing some terrific manueveors that I wouldn't have guessed....HUGE tailslides and the knife edge is POSSIBLE (sorry Capt, I hada try). Another neat plus is that the plane has nearly zero roll coupling when ruddered around a turn, asking for very little aileron comp to remain level. I was having a ball going round and round in a 20ft circle approx 40ft up with just a hint of up elevator applied......super cool!

Flights 4 and 5 were just repeats of the 3rd, I brought her back home quite pleased by the inclusion of the rudder control.....and at a penalty of less than 1/3 oz.

I would like any ideas Don, maybe I'm overlooking something? That yaw trim has me bugged.....although it's "bandaided" for the time being

--Ray

LipoPilot

Would any of this have to do with engine tork? Side the electronics is on? Are you noticing your strange behavior even settled at low power? I have seen a couple Brewster want to roll, I figured it was the power plant making the force roll, not sure.