idealer

My Feedback: (4)

I am in the middle of building a glow version of the stevens aero little cap.

I have a AP .061 that is broke in ready for a plane... I have a few questions.

1. Is this engine to heavy?

2. Is this 1oz tank to big/far forward?

3. The plane calls for hs-55's I planned on trying to use these 4.4 cirrus sevos so I could fit a throttle in between the pull-pull rudder/elivator servos, are they to small?

Any other suggestions before I get to far with this project.

matchlessaero

The Stevens is a pretty little plane, but I cannot remember the stats off the top of my head. Could you put more of the pertinent details such as wing area/span, expected all up weight (and what it weighed as an electric). Those really are the details that will help answer your question.

rrragmanliam

My Feedback: (1)

Looks good so far. Theres alot of meat (weight) in that tail so IMO the tank placement is fine. As far as the AP.061 goes it's all going to boil down to weight. It'll probably be a good performer at 13oz or so but I don't think you will come in that light. The planes probably going to be heavy. Don't get me wrong the .061 will fly it but it's not going to be a hoverbatics type CAP. The 1oz size tank is the right size for the .061.

Personaly I would put a Norvel .074 in it. This engine will essentially pull 20oz straight up. I'm guessing your plane is going to come in at 16-18 oz. If you do go with a .074 use a 2oz tank and you'll get about 13-15 min flights. Also I know alot of folks are using the HS55 servos, I wouldn't go any lighter\ smaller than that. Frankly I'd use a HS81 on the alerons. This plus a small throttle servo + linkage will all add weight. Yet another reason to go with the Norvel .074. IMO

By the way excellent building job! It' a shame you have to cover it. Are you building from plans? can you tell me where to find plans/kit?

Thanks,

Darren

Andrew

I agree with Darren -- looks pretty beefy, but well built -- for all out performance, a .074 may be needed.

Darren, this looks like a lasered kit -- in the bottom picture, the joinery on the fuse. diagonals is pretty detailed, plus the telltail discoloration on the edges.

the "other" Andrew

idealer

My Feedback: (4)

Yes, It is a kit. It is an electric kit from bill stevens (arenablimp) http://www.stevensaero.com

Here are some of the specs:

If thoroughbred sport planes are in your blood.... Pull this baby out at your next IMAC event and watch the other pilots jaws hit the ground. Stevens Aero is pleased to offer the first ever 1:12 scale production Cap 232 kit. This little bird is capable of impressive R/E/A aerobatics. Our signature Interlocking laser cut truss fuselage and tail feathers keep weight to a minimum while maximizing strength.

Description: 1:12 Scale (4 Ch. R/C)
Wingspan: 24.3�
Length: 22.2�
Area: 105 Sq.�
Weight: 6-7 oz.
Wing Load 8.2 – 9.6 oz. / Sq.’
Gear Drive GWS LPS-RLC-C - 4.8v

rrragmanliam

My Feedback: (1)

Hey Idealer, Looking at the specs if you can get the thing to come in at 10- 120z I think you will be fine. I'm not familure with the kit but that's alot of structure for a 6-7oz plane. Thanks for the link. I'm off to look at it.

Darren

Well I looked at it. Your going to deffinatly have to beef up the landing gear for a glow aplication. (more weight) or completly do away with it and build a hand launch plane. The wire gear shown will be good for exactly one hard landing. Also are you going to invert the engine? And your going to have to cut away a fair amount of the cowel to avoid cooling problems. All in all not insermountable problems and it's deffinatly a cool little plane.

Darren

idealer

My Feedback: (4)

Servos... I have both HS-55's and CS 4.4's on hand. I thought I would use the CS's for everything but the Ailerons.

HS-55
Torque 4.8/6.0v : 15 / 18 oz 1.1 / 1.3 kg.
Speed 4.8/6.0v : 0.17 / 0.14 second
Size : .9"x .5"x .9" 23 x 12 x 24mm
Weight : 0.28 oz. 8 g.

CS 4.4
Size: 18x7.5x15.7mm
Weight: 4.4 g/oz
Speed: .12/.10 sec/60
Torque: 1.3Kg-cm (15.6oz-in)

Does anyone know if the Cirrus servos are rated at 4.8 or 6v? They seem to have the same torque?

Engines... How much of a difference will I get from the Norvel .074 vs the AP .061

I have 2 AP's on hand but would consider .074 if it has that much better performance.

rrragmanliam

My Feedback: (1)

The short answer is A TON! The Norvell .074 has the equivilant power of a .10 size engine, and I'll bet it weighs not much more than the AP.061. You'll be turning a 7x3 over 19000 rpm with the Norvel .074. Again it's all going to depend on how heavy it is.

Darren

AP.061 = 1.9 oz
Norvel .074 = 2.6 oz

Andrew

This is a small plane -- the AP .061 will be more than enough, if not overkill. 24" span at 105 sq. in. is a little guy. I've had a Black Widow on a 36" plane with 250 squares -- while it did not fly with extreme authority, loops and rolls were good. An .049 reedie would probably be sufficient -- and you can drop the tank.

the "other" Andrew

stevensaero

Wow looks interesting... the HE 4.9g servos would work just fine but you'll need to shim the mounts (no big deal considering what you are doing)... that goes the same for the cirrus. I'd try and shoot for a conversion weight of no more then 6-7oz wet... I haven't messed with glow in ages but I always thought this model would be a blast on an .010 A .049 would seem like overkill so your .061 is really going to move this thing if you can keep the weight reasonable.

-Bill

PlaneKrazee

My Feedback: (14)

These Stevens planes are extremely light.

Japanman

Hi Idealer...
That seems like a very small plane for a .061 to be in. I would have thought that a cox TD.020 would be the best choice to fly with from what I have read here... But if you are wanting to do hovering etc a .061 is probably going to do it for you.
I have a cirrus 4.4g servo and it is very, very small- While the stats are the same as a hs55 i do wonder about its gear set- it is TINY and wouldn`t take much to break. Also mine got noticbly warm over the engine when I tested it out- it makes me wonder if you really want to stres these little babys-

I have also read here of servos teeth being ground away by engine vibration- so you would probably want to use the supplied rubber grommets as it says on the cirrus bubble pack... except of course that there are NONE![>:]


JM

idealer

My Feedback: (4)

Thanks for all the input, All I have left to do is frame and cote the wing, I will post more pics tonight... Should get all the electronics done by Thursday and maiden this weekend

I am still considering changing the motor; I have a hard time getting these AP's to idle... I might try a norvel .049 that is on hand at the LHS. (They are out of .061's w/throttle)