Espritmodel.com Telemetry Radio
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Old Mar 09, 2014, 02:17 PM
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Help!
Yet another I.d. help thread

Was given this by a member on another forum who received it from a friend's dad who was getting out of the hobby. He thinks it's from the early 80's or late 70's. Any ideas? When I get a chance I will measure the plane to maybe help out. Not expecting anyone to know as there are no markings but thought I'd give it a shot. Thank you for looking.

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Last edited by gunkle; Mar 10, 2014 at 07:22 AM.
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Old Mar 09, 2014, 02:39 PM
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Looks like that's an ACE RC 4-20 sport design...

Dear Gunkle:

The PIPE from New England here...if you get a look at this RCGroups thread from almost a decade ago, you MIGHT recognize your aircraft as an Ace RC 4-20 sport aircraft design, a great one for a small glow ignition four-stroke engine like an OS FS-30 mill that's still available, or a similar-sized Saito FA-30S four-stroker, like I have one of.

Hope this reply helped out a bit...

Yours Sincerely,

The PIPE....!!
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Old Mar 09, 2014, 03:15 PM
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Wow. How did you find that old thread? Thanks. It came with an os 28 engine that looks new. needs muffler . Would that be good enough?
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Old Mar 09, 2014, 03:42 PM
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Sorry it's an os max fp 25
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Last edited by gunkle; Mar 09, 2014 at 05:53 PM.
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Old Mar 09, 2014, 05:25 PM
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Dana, Indiana
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Yep that's a 4-** series, looks to be the 20. You will have more than enough power with the .25 on it as it was designed around the small 4strokes as mentioned above.
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Old Mar 09, 2014, 07:13 PM
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The wing span is 59 or 60 inches. And the plane is 43 inches long. I believe that makes it a 4-40. Thanks for leading me in the right direction
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Last edited by gunkle; Mar 09, 2014 at 07:43 PM.
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Old Mar 10, 2014, 06:18 AM
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Traverse City, Michigan
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Your .25 should fly the model nicely.

I've built three 4-60s, and one 4-40. I have a kit for another 4-40.

This design is a great flyer, and obviously one of my favorites.
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Old Mar 10, 2014, 07:24 AM
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So would this be a good second plane? I just finished building a hobbistar 60 trainer and waiting for the snow to go away to start learning. Should give me some time to set this up with new servos and all
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Old Mar 10, 2014, 08:29 AM
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The airframe is quite aerobatic, in the traditional, non 3-D sense, but with a little help from an experienced pilot, I think it would be a good second plane.

The airframe performs best at slower speeds. This is where it excels. Flown fast, it's just an ordinary, ho hum, model.
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Old Mar 10, 2014, 03:53 PM
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with the .25 engine on this 4-40 what would you recommend for a prop? Or if someone could point me in the direction of a info on how to choose a prop size based on engine and plane size That would be even better.
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Old Mar 10, 2014, 06:25 PM
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Start with an 8X6
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Old Mar 10, 2014, 07:33 PM
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I run a 9x6 on my magnum .25!

or maybe a 10x4 if your worried about speed!
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Old Jun 21, 2014, 07:17 AM
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i'm getting ready to start putting this together. What size servos would be good for this plane? I use these in my hobbistar 60.
Working frequency: 1520us / 330Hz
Operating voltage: 4.8~6.0V
Operating speed (4.8V): 0.13sec/60
Operating speed (6.0V): 0.11sec/60
Stall torque (4.8V): 8.65kg.cm (120.15 oz/in)
Stall torque (6.0V): 9.45kg.cm (130.88 oz/in)
Connector wire length: 265mm
Dimensions: 41x20.3x29.5mm
Weight: 44g

would these be too big? should I go with a mini instead of a standard size? I also have a reciever, 1600 mah life 2s rx battery and an 0s max fp 25 engine.
What size fuel tank are you guys using? If anyone has a good info link about this plane I would appreciate it
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Old Jun 21, 2014, 08:32 AM
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I've used Hitec's HS-225s for quite a while in my somewhat-larger "Swizzler"...

Dear gunkle:

The PIPE Here again - I'm mostly the sort of person who, since I've ALWAYS needed to use "knobby" single-stick radios for ALL my flying needs, have "brought-together" disparate brands of Tx/Rx/servos for almost all of my earlier RC hobby flying experiences.

For what you're stating is an Ace RC 4-40 airframe, your power choice of the OS 25 FP two-stroker could be all right, even though I've been strictly a FOUR-stroke glow mill enthusiast for nearly a generation now. If I had an Ace RC 4-40 for my own flying enjoyment, the Saito FA-40a would be my own choice for power.

You shouldn't need any fuel tank larger than a six ounce capacity one for the OS FP .25 two-stroker...perhaps a four-ounce one could work if you "work the throttle" during flight (with lotsa flight time at 30% to 50% power during a flight) as I've usually done, but the six ounce one...the same size I usually use for .40 to .56 cu.in.-sized four stroke mills...would be a good place to start for what you've got for power.

To get back to the SERVOS you were asking about, my veteran of "radio test sessions" in the air goin' waay back in time, and what's most likely to be my "first plane back in the air" once I can get back to work...



...my early-1980s built Balsa USA Swizzle Stick 40..will once again be using Hitec's HS-225 mini servos for running the tail controls and throttle for its intended refit, this time with a well-used Enya 46-4C four-stroke mill for its power needs, that's in need of a serious overhaul (I got it as a "donated" mill a while ago). The metal-geared HS-225MG version is wisely used for the rudder and tailwheel steering, and I've gotten used to using the somewhat stronger, but still lightweight Hitec HS-77 "low profile" servo for aileron control needs — and YES, I'm one of those "old school" RCers who prefers to stick to using just ONE servo for aileron control on "trainer" airframes like what you've got.

The HS-225 mini servos should be "right in the ballpark" for the servo needs on your 4-40, with a metal geared HS-225MG for a rudder and nose/tailwheel control. You might even be able to use an HS-225 for the ailerons, but the HS-77's light, 35 gram (1-1/4 oz.) weight might be a good option if you need more power on those.

I'm also planning on using A123's LiFePO4-celled, "2S1P"-style airborne packs for my needs - since I do have some older 50 MHz Ham band receivers to get back in the air (licensed Ham since 1978!) I'd be adding a silicon rectifier diode to drop the voltage to 5.6 volts nominal level to keep my receivers and servos happier.

To conclude, the Hitec servos I've mentioned here SHOULD all be good choices for the uses I've stated here...and a six ounce tank would work great on what you've got for power for the 4-40.

Hope these tips helped out a bit...

Yours Sincerely,

The PIPE....!!
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Last edited by The PIPE; Jun 21, 2014 at 08:59 AM.
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Old Jun 21, 2014, 11:03 AM
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I'm gonna use the OS 25 since it came with the plane and I don't have to purchase one. If I decide to change it I will keep in mind your suggestion thanks. I will look into the servos you mentioned. I was thinking of converting to dual ailerons to give mixing and flaperons a try. My only cost to get this flying is servos and related hardware. I believe I have the rest. So I'm interested in what size servos and options I have.
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