pmr

I'm planning on getting a Ca Models Extra 300L 31% (ws=93, fuse=88, wt 17-20lbs) and powering it with a DA 50. I want unlimited vertical and I really dunno if the engine can handle this, for this I need your advice. Also can anyone give any feedback on the Ca models 300l 31%. Thanks.

ScaleRules

My Feedback: (5)

If you want unlimited vertical with the DA 50 then go down to the CA 27% Extra.

If you could keep it at the 17 LBS it should be ok but most people tend to go heavy....

famousdave

My Feedback: (61)

You will definitely NOT get unlimited with a DA 50. I have a CA 31% with a 3W-75i - its a hair under 21 pounds and does have unlimited vertical. Flies great both IMAC and 3D. While the 75 is probably overpowered, the DA 50 would absolutely be underpowered. IMO you will never get the CA 31% under 18 pounds unless you use only one battery, two aileron servos instead of 4, and the dremel to remove some plywood with the DA 50 up front. I don't fly any big birds on one battery pack....

If you have a DA 50 - go with the Wild Hare extras... a much better fit. The CA 27% is too light for a DA50, you'll tear it apart.

DP

Rhilluk

One thing that matters with petrol is the fuel you use, USA has some extra additives in their fuel so they tend to get about an extra 200 rpm, us Brits have to put up with the low lead, low pollution petrol. However seen a Da50 power my mates 28% own design extra 300 and it would take it up vertically pretty nicely, weighed 18lbs, was a bit heavy for it's size but is a lovely precise aeroplane.
Don't think the Da50 will tear the CA extra 27% apart, they're built for that size engine.
A 75cc would be better for the 31%, maybe even the ZDZ80.
Another person I know flew a 30% extra with a 3W70twin init and it was fine. - just food for thought.

pmr

Thank you guys for all your advice. I'll probably get the 27%.

GoeKeli

My Feedback: (18)

Does anyone know the wing area of the CA31%? Good luck with your plane PMR!~)

Joe

JB Rekit

My Feedback: (3)

I personally would get the 31% with the DA 50.

I know the trend right now is to try to get the plane to fly more like a fun fly and less like a scale plane, but my dad down in Houston has the 31% CA with a ZDZ 80 and it is very heavy at 23.5 lbs, and I would consider it to be almost rediculously overpowered. He is now building the 34% CA for the ZDZ.

As far as the plane goes, it flies a very true pattern. I haven't tried much 3D with it b.c it is a little too heavy (quite a bit of wing rock) and is a little overpowered as well.

The main criticism I have for my dads plane is that it came out too heavy and has too much motor on it b.c it flies WAY to fast through the pattern. (It has the KS tuned pipe and if it is in the tuned portion of the pipe (half throttle or more), the plane scoots).

But, do what you want and good luck to you.

And his plane has 1.2#'s of nose weight (to offset the pipe behind the wing)
2 servos per aileron
2 2200 mah rx batteries
2000 mah ign battery
5 oz 57XX 260oz tq hitec servo.
Tuned pipe setup 2 #'s

No other lightning mods on the plane CF gear, spinner, wingtube

With what I just named, you could easily save 4 lbs. 5+ would even be feasible if you went out of your way to make it lighter.

You would also want to move your wing back about an inch or so so that ou don't need to add nose weight to balance it properly.
I think he moved the wing back 1.25" on his 34% in hopes of not having to add nose weight.

just my $.02

famousdave

My Feedback: (61)

23.5# is way overweight. I would cut into the tail before I ever added 1.2# of lead to the nose of anything!! I got mine down to just over 20 pounds by putting in a single 8611 on rudder instead of 2 8411s. All the batteries, ignition, throttle servo and switch hardware is up front of the CG, the rudder servo is as far forward as possible (didn't use stock location) I did not have to add weight at all. Same overall setup you have..

Flies like a MONSTER on a 3W-75i..

DP

JB Rekit

My Feedback: (3)

The rudder servo is probably less than 1/16" behind the wing tube (about 1' in front of stock location).
And all electrical equipment is in front of the wing tube (just did a very thorough ground test to make sure there was no interference since there was only a few inches between rx batteries and ignition components)

He doesn't fly 3D at all and since the engine is so overkill, it could probably still be a few lbs heavier and not fly any different as far as his pattern is concerned.

And if he did want it to 3D, it would probably be easier just to take off the tuned pipe that exits behind the back of the wing, add an in cowl muffler, and take out the nose weight. That would get about 3 pounds out of it. For him just flying pattern though he gets more benefit by keeping the longer tail moment and keeping it quiet.

Sprink

How about the ZDZ 60 for the 31%?

Foof, it is actually probably the other way round. European fuel has a higher octane level, our standard is 95, in the US it is 89 (i think), so if anything, they would run slightly better here.

Diablo-RCU

My Feedback: (1)

Nah, engines don't run any better in the US than in Europe. We just pay a lot less for the petrol (gas). You fellows over there rate your gasoline by a different method so the numbers are offset by 5 or 6. We use the average of R & M (Research and Motor Octane tests).

dentdoc

My Feedback: (3)

20Lbs is OVERWIEGHT!! I got one with a ZDZ 80, Single 8611 on all flying surfaces, NIMH, Carbon All up, Pro-Build from Against The Grain @ are you ready for this---------- Drum roll please!!!!!----- 17.7 pounds!!! So it can be done!

Flight reports forthcomming! Can you tell Im happy!