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ORIGINAL: aerobob

Extras and Edges share that funky Lycoming O-200 cowling....NARROW in vertical dimension...or O-540, same same problem, so all the models are based on the same thing... Unfortunately, except for the 35% and larger "twin" models, our single cylinders in the 40-50cc class are "jugs", and generally do not work well horizontal.

So most of us just hack the cowl open, mount it inverted, and be done with it. That's a GOOD thing, however, as gas engines need AIRFLOW. Not a lot of IN, but really a L-O-T of "out"....

I think you just have to accept a hole in the cowling, and inverted-mounting the motor, regardless of breed you decide upon.

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ORIGINAL: poco242

I am actually going to do a little experimenting with making a canister for the 46 and 60. Some people want them and I know I can build one for far less than the $140+ price they cost usually. I do not know what power increase there will be, but it will reduce noise by a good margin I am sure. Plus I do not think they need to be as big as they are.

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ORIGINAL: sinergy

Well I guess I will chime in here :)

I have my Patty weighing 15.3 pounds now and my CF gear will be here tomorrow which will put it down close to 15.

I have the Brillelli 54 in my Patty which has a little less wing area and is heavier than the plane you are building. At 16.5 pounds (3 overkill batteries and all stock) the plane would hover a little bit over half throttle and pull out is decent. At 15.5 pounds hover was below half throttle (around 1/3+) and pull out is great. At 15 pounds its going to hover around 1/4 with awesome pull out.

This plane is going to come in around 13 pounds if you use a light engine. My advice would be to get the Brillelli 40 because of several reasons.

#1 Unlike the 46 and the BME 44 it doesnt need rail mounts (waste of weight)
#2 A 50 or 60 is just going to be stupid power with higher wingloading for no reason.
#3 Its a very powerful 40 and will hover a 13 pound plane well.
#4 I was hovering a 15 pound Yak with a 44 at just over half.. but pull out was way too weak. Save 2+ pounds and its a major difference.

All engine suggestions in this thread are great... Taurus makes an excellent engine as does ZDZ and DA however for price, customer service / support, and performance a Brillelli 40 is going to be the best value for the buck for this plane.

my 2 cents :)

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ORIGINAL: aerobob

Thrust depends on prop. Prop rpm depends on torque/power of the motor. It's a continuous variable.:D

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ORIGINAL: aerobob

Great improvement! :D

Of course, though, actual "performance" is a function of the aircraft mass, drag, lift, wing-loading, etc.

The same airplane, same motor, two different props = TWO different airplanes. Usually.

(Just being a smart-***** - jerkin' yer chain) :):)

So far, I'm concurring with the 40 recommendation. If you don't like it, you can SURE resell it (probably at a profit, as they are hard-to-get) and get the 46....but the 40 will fit WAY better in your cowl, and based on your construction probably will be SUPER.

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ORIGINAL: RVM

Hovering on its own is boring, though lots of consecutive vertical snaps followed by a waterfall with an inverted flat spin is really cool...

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ORIGINAL: sinergy

If I were you I would get the 40 and put the extra money into a CF tube, CF spinner, and some lite NoBS batteries. Possibly PSP titianum axels and Kavan or foam wheels. This will get you closer to 12 pounds (if not maybe lighter) and then your wingloading is getting to overgrown foamy territory. That will be nicer then an overpowered heavier plane in my books.

I flew the 46 in my Patty and while it could hover pull out was a bit slow.. but it was a rocket and verticle wasn't a problem. That was at 16.25 pounds. I know the difference with the 54 and saving 1.25 pounds is night and day.. so 3 pounds difference would be overly crazy I think. I like a fast powerful plane dont get me wrong.. but I still think the 46 is overkill.



on a side note my 54 turns a Mej 22x8 prop at 7050, a PT 22x8 at 7150, and an NX 22x8 at 6950. The 46 turned a Mej 22x8 at 6650 - 6700 if I recall correctly. All of these #s are running fairly rich

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ORIGINAL: Bass1

RVM, From your plans it seems your plane doesn't have an "engine box" but a full size ply firewall. If thats the case you most likely will not be able to use a pitts muffler unless you do a major mod to it. I ran into the same deal with my Miles Reed Extra 260 and ended up using this clunky BCM side mount muffler for my ZDZ 40. It works well though, just not as pretty as I would have liked.:eek:

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ORIGINAL: Bass1

RVM, Here is a shot of my 260 when it was just completed.

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