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Author Topic: CL to RC conv.?  (Read 288 times)
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cbaker65
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« on: January 13, 2017, 09:57:34 PM »

This is the project that I want to accomplish.
It is a barn find ,an its a 48'' control line model that I think can be turned into RC if done right.
It has fully function rudder ,flaps an elevator.
I'm going to see if a size 20 has enough UMP for flight ,if not ,I have bigger engines ,but would really
like to keep it light.

https://s20.postimg.org/t4wgvkx19/HPIM1598.jpg

https://s20.postimg.org/s3w86gg1p/HPIM1599.jpg

https://s20.postimg.org/dn8yrvqkd/HPIM1597.jpg

Heres another possible ,but the wings need recovered!

https://s20.postimg.org/car9pzt4t/HPIM1600.jpg

https://s20.postimg.org/sn1bfq7gd/HPIM1601.jpg
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Konrad
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« Reply #1 on: January 13, 2017, 10:15:34 PM »

It has been done with varying results. Often the wings are too thick, and/or of different lengths, the fuse is often too short and the vertical fin is shy on area.

This means that most C/l to RC conversion have stability issues. But with today's gyro equipped receivers it might just work out fine.

Please let us know how it turns out, be it successful or a failure.
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Cut it twice and it's still too short!
cbaker65
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« Reply #2 on: January 13, 2017, 10:50:11 PM »

It has been done with varying results. Often the wings are too thick, and/or of different lengths, the fuse is often too short and the vertical fin is shy on area.

This means that most C/l to RC conversion have stability issues. But with today's gyro equipped receivers it might just work out fine.

Please let us know how it turns out, be it successful or a failure.

I can give a few measures ,I feel that it has a large vertical fin area!

Its 48'' w-span x 8'' wide ,with flaps is 9'' to 10'',2'' thick from the mid spar.
32'' fuse length
nose to the leading edge of wing is a 7 1/2'' distance
stabilizer is 18''
rudder is 8'' tall in which starts at the bottom of fuse.
I don't have radio gear yet ,but looking ,an want to get some strong micro servo's to save weight.
Maybe small lipo for receiver battery.

If all else fails ,it would be a candidate for free flight!...LOL
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Konrad
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« Reply #3 on: January 14, 2017, 01:17:41 AM »

Weight really isn't the primary issue, stability is. On the subject of servos many 9 to 13 gram digital servos should be adequate and work well with gyros. I wish you the best of luck.
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Cut it twice and it's still too short!
TimWescott
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« Reply #4 on: January 14, 2017, 04:58:23 PM »

The first one is a Sig Twister.  The second one is, I think, a Stirling Mustang -- but everyone built Mustangs, so it's hard to tell.

Measure the length of each wing panel -- I think you'll find that they're different.  If so, it'll affect how it works in a roll.  You'll need to cut the flap horns, and that Mustang, at least, will need more rudder area.  Don't be surprised if the Twister doesn't, too.

As an RC plane, with a modern-day 20, the Twister should work out well.  You might want to go to a 32 for 3D performance, though.

Or just slap an engine on the Twister and go fly control line -- it's a hell of a lot of fun.
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cbaker65
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« Reply #5 on: January 14, 2017, 07:10:31 PM »

The first one is a Sig Twister.  The second one is, I think, a Stirling Mustang -- but everyone built Mustangs, so it's hard to tell.

Measure the length of each wing panel -- I think you'll find that they're different.  If so, it'll affect how it works in a roll.  You'll need to cut the flap horns, and that Mustang, at least, will need more rudder area.  Don't be surprised if the Twister doesn't, too.

As an RC plane, with a modern-day 20, the Twister should work out well.  You might want to go to a 32 for 3D performance, though.

Or just slap an engine on the Twister and go fly control line -- it's a hell of a lot of fun.

Thnx..

Those two ,the rudder is hinged ,with out push rod ,however ,there was a fixed rod to adjust the rudder angle with clevis ,which is a +.
But yea ,I see what your saying about the flaps because both sides go one way ,an they need to work opposite from each other!

At this point ,I may take care of those ,put the engine in ,figure out CG ,put radio gear an try to test fly ,if it crashes ,its no lost!
An just build a plane ,I have all engines ,an soon have radio gear...

To be honest with you ,I didn't even know that these size planes existed in C/L !... Embarrassed
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cbaker65
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« Reply #6 on: January 15, 2017, 08:57:03 PM »

I put this Os 20 on today ,but don't have the original muff. for it ,so I modded this rc car tune racing pipe to fit.
I still have to cap the header inlet off though ,I want to fire this up an see what kind of thrust it put out to
see if the engine is even powerful enough!
I got several size props as well.I think theres a 9 on there now ,an have a 10-6!
This plane is only an experiment ,maybe a laughing one ,but I'm willing to entertain!... Grin

https://postimg.org/image/rtqn3om61/upload an image
CL to RC conv.?
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TimWescott
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« Reply #7 on: January 16, 2017, 01:44:38 PM »

The engine is a 20FP?  The OS 20 from the 1970's won't be powerful enough, but the FP should be.  I'd suggest an APC 9-4 as a starting point for the prop -- the engine wants to spin fast to generate power.
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cbaker65
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« Reply #8 on: January 16, 2017, 03:48:43 PM »

The engine is a 20FP?  The OS 20 from the 1970's won't be powerful enough, but the FP should be.  I'd suggest an APC 9-4 as a starting point for the prop -- the engine wants to spin fast to generate power.

Thnx for the heads up!... Cool

I don't think its the FP ,because it has no muffler bolt holes ,so I think it is from the 70's!

I think that I have a 35 out in the shed ,but after that ,all of my engines are size 40 ,61 ,an I think a 91.
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TimWescott
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« Reply #9 on: January 16, 2017, 04:34:09 PM »

It might make an OK sport plane with that engine.  It won't be a "point in any direction and accelerate" plane by any means, but it'll at least go.
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cbaker65
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« Reply #10 on: January 16, 2017, 06:09:02 PM »

It might make an OK sport plane with that engine.  It won't be a "point in any direction and accelerate" plane by any means, but it'll at least go.

I'm going to go ahead an try it ,I still need to do a lot of work on the plane ,so I cant try to fly it yet!

I know that this engine isn't the one that was on the plane ,the bolt pattern doesn't match on the plane ,but
sense I already have it on there ,I will see if the engine will fire ,like a test if you will!

I may just pull it ,an try the 35!
I want to convert this to RC ,but I don't have radio gear yet.
I may go try an locate the tether an try to fly as a CL ,but never flown a CL before ,an its been nearly 20
years since ive flown an RC plane ,an Ive never flown this type of low wing plane!

 Do these type of planes require more airspeed for more lift?
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TimWescott
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« Reply #11 on: January 16, 2017, 08:10:40 PM »

It'll certainly fly faster than a well-designed RC trainer would with that engine.

If you haven't flown RC for 20 years and you're going to start with a semi-experimental high-performance plane, I think your flights are going to be very short and frustrating.  I wouldn't even recommend something like that to an experienced pilot if I didn't know they were ready for some crash-and-repeat.

If by chance you're in the Portland Oregon area, send me a PM and I'll help you out with your first flight -- RC or CL.  If not, check out this map and see if there's a flying field close to you.  Whether you go CL or RC, getting some hands-on help is vital.  Figure that if you show up with a Twister converted to RC for your first flight that the first thing your instructor will do is to recommend a different airplane.

Here's a good video on CL flying -- note that most of the planes are at least the size of your Twister.  For aerobatic competition it's considered to be on the small side (but it's a great stunt trainer).

If you're saving pennies for a radio, look at Hobby King and the other importers.  There's some really nice basic radios to be had for astonishingly small amounts of money.
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cbaker65
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« Reply #12 on: January 16, 2017, 08:24:35 PM »

It'll certainly fly faster than a well-designed RC trainer would with that engine.

If you haven't flown RC for 20 years and you're going to start with a semi-experimental high-performance plane, I think your flights are going to be very short and frustrating.  I wouldn't even recommend something like that to an experienced pilot if I didn't know they were ready for some crash-and-repeat.

If by chance you're in the Portland Oregon area, send me a PM and I'll help you out with your first flight -- RC or CL.  If not, check out this map and see if there's a flying field close to you.  Whether you go CL or RC, getting some hands-on help is vital.  Figure that if you show up with a Twister converted to RC for your first flight that the first thing your instructor will do is to recommend a different airplane.

Here's a good video on CL flying -- note that most of the planes are at least the size of your Twister.  For aerobatic competition it's considered to be on the small side (but it's a great stunt trainer).

If you're saving pennies for a radio, look at Hobby King and the other importers.  There's some really nice basic radios to be had for astonishingly small amounts of money.

Yea Thnx!.. Cool

Yea ,that 20 is too small ,I just got done firing it up ,I'm quite sure that my Os 15 had more balls than that!
So on with the 35!.... Grin
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cbaker65
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« Reply #13 on: January 17, 2017, 09:47:09 AM »

I was digging in my shed last night an found a Os 30 ,so I will get it on an test it today!... Grin
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cbaker65
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« Reply #14 on: January 19, 2017, 12:48:25 PM »

I don't like side ways engines ,so I'm doing a mod!
If all else fails ,then I will be forced to argue with the wife to buy me a kit!.... Grin

https://postimg.org/image/sqeotl455/


https://post[url=https://postimg.org/image/jde3ph0e1/

https://postimg.org/image/rwxhn88qh/

https://postimg.org/image/i0wenl2yh/

https://postimg.org/image/48hzryc6x/

CL to RC conv.?
CL to RC conv.?
CL to RC conv.?
CL to RC conv.?
CL to RC conv.?
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cbaker65
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« Reply #15 on: January 19, 2017, 03:50:38 PM »

Got it cinched down ,so now I'm going to start on tank mod!
Tank is being inset into the fuselage behind the engine.
An also ,may drill some nice lightning holes into the engine mount!

https://postimg.org/image/6fqttm6ux/

https://postimg.org/image/kngii9jjt/

https://postimg.org/image/ol3s7o6d5/

CL to RC conv.?
CL to RC conv.?
CL to RC conv.?
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