Tall Paul

I know this is a waste of time...

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rmh

Did the servo information just do a nose dive?

Tall Paul

(Non-sequiturs and irrelevancies are that source's stock in trade.)
Back on track I use mini and micro servos on my park fliers, so I expect Coos' plane will be OK with the same, as long as the pivot point is located where reality says it has to be.
On my Femto 400, there's Cirrus CS-21 BBs, and on the Yard Stik Hitec HS-55s. As neither plane, nor Coos' will get transonic, these should be OK for the low loads of a park flier.
But also as noted, for manuvering a flapped (seperate horizontal and elevator) surface is better as it can generate higher Cls before it stalls.

FHHuber

LOL his own 3-view show visible downthrust. see the engine nacell centerline compared to the grid... then compre the grid to the fuselage centerline (same line as the grid)

Yes its a waste of time...

Tall Paul

New thread begun, to keep this on one track...
"Nine or nought"

FHHuber

LOL. You lost... by your own picture ...so now yopu are taking your toys and going home.

rmh

I mentioned the digitals simply because the heart of a good flying stab, is the precise positioning needed
the tiny albiet expensive JR digitals really lock into position
One of these would handle even a very touchy aerodynamic setup

Tall Paul

I have a few $10 planes with $80 worth of servos..
Aeroloads on park-fliers are low, and the need to avoid the neighborhood trees and fences and kids keeps the surfaces moving, so precision of position isn't a major driving force.

edge_fanatic

My Feedback: (4)

Folks,

Please keep the thread on technology, and keep the personal comments about each other out of it...

If you don't wish to play nice, please don't play.

Thanks,

Sean

rmh

Yep - familiar with the low end servos- some are totally adequate.
Some are not- I have boxes full of all types -
If you ever need precision -these new digitals are VERY good

CoosBayLumber

My Feedback: (1)

The glow engine size somehow got mis-quoted. The intended size is going to be a .061, not a .61.

The overall weight is figured to come in at about 2Lbs, 8Oz.
At present time, we seem to be a bit lighter than this, but have not estimated fuel weight, nor weight of covering.


Wm.

CafeenMan

40 ounces is a lot of weight for a .061. Either the wing will need to be too big so it can carry the weight or the wing loading will be too high for a smaller wing. So if it's a speed plane it should rock, but if it's an aerobat, then shoot for 24 ounces.

- Paul

FHHuber

I'd be looking for even lighter than 24 oz for the .061... Should be able to approach 1 lb on a 1/2 A size aerobatic model.

CafeenMan

Hand launch or with gear? 4 or 5 servos?

FHHuber

With gear and 4 appropriate size servos... I think 1 lb is workable for a .061 powered Aerobatic model. Not with a 600 mah battery in it... (cut that in half... save some weight, still have plenty of battery for the size model...)

20 years ago I had 2 channel model which was by no means light for its size come in at 1 lb even with the 600 mah pack and larger, heavier servos that what you could use today. And I had the hefty 7 channel Futaba RX in it... Work at saving weight using modern stuff... ( a Hitech 555 RX with the case removed and heat shrink tube... then foam wrap... save 1/2 or more of the weight of theat 7 CH Futaba RX with case still on it...) lighten the sheeted foam core wings (much heavier than they needed to be... sheeted with aircraft ply!) it would be easy to build the same basic 46 inch span design with the mods to make it 4 channel and add landing gear... and be very close, if not right on 1 lb.

Heck... the 2 1/2 lb is listed as MINIMUM weight for a .15 powered "SSC" (Slow Safe Combat? close... but not quite...) model made of COROPLAST! Some people are adding lead to those to meet the minimum weight!

Read up on 1/2 A R/C racers... they generally are 2 channel... but close to 1 lb, and have been for 15 years. New micro servos are amazingly light and powerful...
*********

Here http://www.hobby-lobby.com/threedee.htm

glow power convert that... bet you can come out under 20 oz... I can't find the ad for the electric Pattern plane they have been advertising to check its stats... The BATTERY in this thing is 6.9 oz of its 24 oz...

CafeenMan

Well, I've managed to stick to around 30 ounces for a .15 size plane, but I don't build many 1/2A's any more. However, I have a Norvell .061 and I'm trying to build it a nice home. That's why I was asking about your ideas.

I can go with no gear - don't mind hand-launching. I'd also like 5 servos. I have enough nano's to go around (Futaba 3006 (4) and some Graupner/JR something or others that are longer and narrow then the futaba's.)

So I'm thinking up to 300 squares, 1/8 x 1/4 balsa spars with 1/32" webs, and caps (no ribs except center and root)

Sort of something along the lines of the E-3D but smaller.

FHHuber

Too bad i can't get another kit for a certai slope glider. It would be IDEAL for your purpose. Easilly could stick the 1/2A in the nose and have a FAST agile little plane that's tough as nails. (and can thermal with a Gentle Lady... if you can keep it under 18 oz... so slow speed is NOT a problem.)

BTW... it had a flying stab but for aeobatics... you would want the split elev and fixed stab... (easy conversion)

Scale down a Sig Wonder. lists at 26 oz minimum (.09 to 15 size plane) but it comes out under that with a OS .15 FP using mini servos and a 300 mah pack. (my scale is inaccurate under 24 oz... couldn't weigh the thing)

rmh

You guys are not relly trying very hard -- 300 squares with a good electric setup is 13 ozs --with a 1500mapack- lots of em and they are super aerobats.

On glow -we did 1/2 A racers at 12 ozs - two servos . (1980)
for aerobatics this small the electrics really beat the glo .-never thought I would see that one --
I use the Himax 4100 and 5400 motors.

CafeenMan

It's not that I'm not trying, it's that I don't remember how big a 1/2A size plane should be. I've been mostly working in .15 - .46 with my designs. Once I know how big it's going to be I can keep it light. I do want 5 servos though and I would use a 350 pack.

FHHuber

LOL... time to split the thread... we are WAY off topic now.

CafeenMan

Wasn't the topic, "CafeenMan's 1/2A aerobat that probably won't get built for 3 years?"

Sorry. Didn't mean to hijack the thread.

CoosBayLumber

My Feedback: (1)

You guys ought to know by now, I got poor eyesight and fat fingers. There was a typo again.

Old plans indicate weight to be Max. of 1 pound 8 ounces. Not two pounds, plus. That is based upon older single channel radio equipment using B batteries, tubes, escapements, etc. The radio equipment alone looks to weigh nearly a pound. My thought is that it ought to end up around one pound plus.


The model is not intended to be aeroperforming, as the wing area is only 230 S.I.


Wm.

FHHuber

I had you figured out pretty well... The mention of VERY LIGHT.. and back yard flying said... this is NOT a .61 powered model.

I haven't found anyone that thought a .61 powered plane was good for a back yard smaller than 10 acres.

CafeenMan

I'm sure somebody in this forum would actually encouarge it and call themselves a rebel.