paper_hunter_2000

I've been flying 3-D stuff (Twist, Funtana, etc..) but came across a great deal on a World Models Airacobra ARF (60) which the builder never flew. Looking for any objective information as to her flight characteristics and other useful information. She is equipped with an OS-61. Some have said she flys like a trainer but others mentioned bringing her in hot. I guess it's the subjective view of the pilot.

Thanks in advance,
PH

paladin

My Feedback: (9)

I test flew one powered by a LA.65. Found its top end to be slow average for a .60 size war bird. It was capable of all prototypical maneuvers with ease. When doing the stall test this one would drop the right wing but the builder had admitted prior to takeoff that he thought he had put that twist in the wing. It was a very gentile favoring of the right wing and I told him we could band saw it apart and re-glue or leave it and he is still flying it. There were no surprises on takeoff or landing, landing speed was about average for a sport plane as long as you make a level approach. But even with the nose down on final it did not pick up much speed.

If I had to rate it’s flying type from high wing trainer, to low wing trainer, sport plane, first scale plane (light, w/o flaps), etc. I’ld say it fit just between the low wing trainer and sport plane.

Joe

paper_hunter_2000

Joe I appreciate the great information. Plan to fly her sometime in the next two weeks weather permitting. Will post the results.

jrotor

My Feedback: (5)

Can we get more feedback about this plane please ?
I'm thinking about Magnum 91 4-stroke for this plane, would that be enough ?
Any one coverted the landing gears(nose and main) to retract-able ?

Thanks.

Jake.

paladin

My Feedback: (9)

Jake, the 90 is to much for this plane. Your problem will be proping it and not hitting the ground, mowing the lawn , while taxiing. So you will never be able to extract all the power from the 90. I could fly it easally on a 45, but I would not recommend it with out experience with AOA and Speed. A la 65 is perfect!

Joe

jrotor

My Feedback: (5)

paladin,
I think you mean 90 two-stroke engine is too much, right ?
I meant 91 "four-stroke" engine which is equivalent to
60 two-stroke power.
Can we confirm about this ?

Jake.

cat5752

My Feedback: (1)

Put a three bladed prop on it for ground clearance? Would look good. I saw the same model here at the LHS. Looked pretty good, but a .91 4 stroke might be too big. You could always go with the line that you don't have to open it all the way up

jrotor

My Feedback: (5)

cat5752,
I have a question, could u pls tell me why 91 4-stroke will be too big ?
The spec says 91 4-stroke is suitable.
Thanks.
Jake.

jrotor

My Feedback: (5)

cat5752,
I have a question, could u tell me why 91 4-stroke will be too big ?
The spec says the plane is for 91 4-stroke.

Scar

My Feedback: (3)

Not to put words in Paladin's mouth, but I believe he says above that you'll have to use a small prop to keep from mowing grass. As a consequence, the .91 fourstroke (which has torque for a large prop, but not necessarily high RPM for a small prop) will not provide the power equivalent to the .60.

I'll be looking for responses about your retract question. I'm starting on a TF P-39 (it's been in the attic for quite a while) and retracts would be a nice touch.

Good luck,
Dave Olson

paladin

My Feedback: (9)

Sorry, I did assume it was a 2c. But the answer is still the same. set the model up on a table measure from the table to were the prop. hub center would be. A 90 4c will most likely turn a 13 or 14in prop and you need 2in min. prop clearance to the table. At two inches prop clearance you will mowe lawn untill you rotate, but you will really have to work to get a prop strike.

Joe

jrotor

My Feedback: (5)

I lost my manual, can someone tell the CG point ?
Thanks.