Scratch building a P38 for 2 .40 size engines.  
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All Forums >> RC Airplanes >> Twin & Multi Engine RC Aircraft >> Scratch building a P38 for 2 .40 size engines.
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Scratch building a P38 for 2 .40 size engines. - 1/15/2004 9:47:47 AM   
Yakirg


 

Posts: 16
Joined: 5/27/2003
From: Zoran, ISRAEL
Status: offline 		Hello all!
I have been infected by the same virus most of you have ... The P38 virus ...

I managed to get plans for a 60 size P38 (212 Cm wingspan) and down scaled it to a 160Cm wingspan for 40 size.
The plans don't have the flaps, which I'll be adding (If i'll ever get it done ...)

Any thoughts on what I should watch for? Any known tricky bits?

I am not an experienced builder and am learning as I go ...

Any input will be appreciated!!

yakir
       Post #: 1

RE: Scratch building a P38 for 2 .40 size engines. - 1/15/2004 2:51:02 PM   
M Gill


 

Posts: 413
Joined: 6/5/2002
From: Martinsville, NJ, USA
Status: offline 		How's your flying skills?

If you have never done a twin before you might want to "get your feet wet" with a twin ugly stick while you are working on your P-38 project. It will give you experience working out all the picky little technical glitches with a plane that has less emotional, financial, and time investment.

Mace Gill
The Aeroplane Works
http://www.theaeroplaneworks.com

(in reply to Yakirg)
       Post #: 2

RE: Scratch building a P38 for 2 .40 size engines. - 1/15/2004 11:03:54 PM   
Flak


 

Posts: 1446
Joined: 11/24/2002
From: Olathe, KS, USA
Status: offline 		Your P-38 will be FAST. The air molecules don't reduce in size with the airplane, so the high wing loading will be a challenge. Practice flying a trainer at full throttle, advance to some twin trainer, fly it as fast as you can and become a master. Then you may be ready for your P-38. Seriously, I advise you get the Great Planes G2 flight simulator and the Add On with the P-38 and practice, practice, practice! You can make the planes whatever scale you wish and power them with whatever engines you prefer. I puy a big jet engine in a P-51...what a hoot! Good luck.
"Keep 'Em Flying!"
Flak

(in reply to M Gill)
       Post #: 3

RE: Scratch building a P38 for 2 .40 size engines. - 1/16/2004 1:11:25 AM   
flying2bill



Posts: 485
Joined: 12/25/2001
From: Central City, IA, USA
Status: offline 		Depending on how heavy it gets you may want to rethink the flaps, A) finding room for the servos may be tricky, b) the extra weight may not be worth the gain. I would also consider using hi-torq mini servos to save space and weight, will also recommend two servos for rudder and elevator for positive control, also remember washout in the tips to tame the stall and one of the most important things is to use equal time motors that are well broken in and RELIABLE. All of these suggestions should help lead you to this

< Message edited by flying2bill -- 1/15/2004 8:11:07 PM >


_____________________________

Rule of the 3 W's
If it involves Wheels, Wings, or Women, it's bound to be trouble.

(in reply to Yakirg)
       Post #: 4

10x guys! - 1/17/2004 5:53:04 PM   
Yakirg


 

Posts: 16
Joined: 5/27/2003
From: Zoran, ISRAEL
Status: offline 		I really started to think about a twin trainer ...
I am also having second thoughts on the OS 40la engines I chose ... Am thinking of the OS 52 Surpass ... The 4 stroke will add a lot ... But cost almost 4 times ...
Other then the speed and single engine flight, does the P-38 fly different then other single planes? (P-51)?
The 40la will be overpowered on 1.6M wingspan? I am aiming for 5Kg takeoff weight ...

Again, 10x for the input!

< Message edited by Yakirg -- 1/18/2004 11:07:50 AM >

(in reply to flying2bill)
       Post #: 5

RE: 10x guys! - 1/18/2004 7:58:44 PM   
flying2bill



Posts: 485
Joined: 12/25/2001
From: Central City, IA, USA
Status: offline 		If you are looking for a nice little trainer, easy to build, small in size, easy to fly, twin, and want to use those .40 LA's try one of the OV-10 bronco designs in about a 50-60 inch span, will accomidate retracts and rudders, the one I had, had a constant cord wing, I flew mine on .25 4 strokes but the guy that built it used .40 2 strokes, the LA's would be plenty


_____________________________

Rule of the 3 W's
If it involves Wheels, Wings, or Women, it's bound to be trouble.

(in reply to Yakirg)
       Post #: 6

RE: 10x guys! - 1/18/2004 9:06:23 PM   
twinman



Posts: 1628
Joined: 1/19/2002
From: Katy, TX, USA
Status: offline 		Yakirg
Please do not consider a P-38 as a twin trainer. It is not. Been there done that, don't make that mistake.
It is a fantastic looking plane in the air, but can bite you faster than almost anything else.
Really get twin experience first.
Good Luck,
Twinman

(in reply to Yakirg)
       Post #: 7

RE: 10x guys! - 1/18/2004 9:19:07 PM   
Edwin


 

Posts: 3301
Joined: 2/8/2002
From: Leander, TX, USA
Status: online 		Maybe you should stay at 212 cm instead of shrinking it down. Might help the wing loading a bit.

Hey Twinman,
A buddy in my club bought an Aerotech (?) P-38 at the swapmeet. It appears to be balsa covered foam job. He's challanging me to get mine repaired before he finishes his.
Edwin

(in reply to twinman)
       Post #: 8

RE: 10x guys! - 1/18/2004 11:03:02 PM   
twinman



Posts: 1628
Joined: 1/19/2002
From: Katy, TX, USA
Status: offline 		Edwin
Watch out on that Aerotech. I built is and it is a "Quick Build". Hope your buddy has imagination and good building skills....he will need them.
San Antonio next.
Good Luck,
Twinman

(in reply to Edwin)
       Post #: 9

RE: 10x guys! - 1/19/2004 1:46:56 AM   
Edwin


 

Posts: 3301
Joined: 2/8/2002
From: Leander, TX, USA
Status: online 		Hes a long time builder and warbird pilot. When is San Antoinio? There is one Feb 7 in Schertz Tx. It used to be held in Seguin. Info at www.tricityflyers.com.
Edwin

(in reply to twinman)
       Post #: 10

OK! Twin trainer it is! - 1/19/2004 7:29:05 AM   
Yakirg


 

Posts: 16
Joined: 5/27/2003
From: Zoran, ISRAEL
Status: offline 		How about building a new wing with 2 engine pods for a my old superstar trainer?
It's a high wing trainer, so the engines will be suspended below the wing ...
Will I need to change the tail configuration?
What wingspan do I need? (The original wing is 60"
Symmetrical/semi symmetrical? Washout?
Man I have a lot of questions this morning!
Will a Saito 40 be enough for the P38 (about 64"wingspan)?

(in reply to Edwin)
       Post #: 11

RE: OK! Twin trainer it is! - 1/19/2004 4:29:58 PM   
twinman



Posts: 1628
Joined: 1/19/2002
From: Katy, TX, USA
Status: offline 		Yakirg
There are several posts about bashing a single into a twin. Do a search. Here is one http://www.rcuniverse.com/forum/m_547693/mpage_1/key_bash%252Ctwins/anchor/tm.htm#547693
I would consider using high thrust two blade props for that engine combo. It will work, but forget the three blade props.
Good Luck and send pictures,
Twinman

(in reply to Yakirg)
       Post #: 12

Fowler flaps design - 1/25/2004 2:41:51 PM   
Yakirg


 

Posts: 16
Joined: 5/27/2003
From: Zoran, ISRAEL
Status: offline 		Can anyone send me a drawing of the fowler flaps mechanism?
I am going to have to build them myself and wanted some help ...

10x

(in reply to twinman)
       Post #: 13

RE: Fowler flaps design - 1/25/2004 2:45:37 PM   
twinman



Posts: 1628
Joined: 1/19/2002
From: Katy, TX, USA
Status: offline 		You can go to VQ website and see their fowler flaps in action at http://www.vqmodelaircraft.com/.
Good luck,
Twinman

(in reply to Yakirg)
       Post #: 14

RE: Fowler flaps design - 1/25/2004 5:10:39 PM   
twinman



Posts: 1628
Joined: 1/19/2002
From: Katy, TX, USA
Status: offline 		Found more on the flaps in the warbirds section at http://www.rcuniverse.com/forum/m_1282843/mpage_3/key_/tm.htm
Good luck,
Twinman

(in reply to twinman)
       Post #: 15

RE: Scratch building a P38 for 2 .40 size engines. - 1/25/2004 5:21:46 PM   
Yakirg


 

Posts: 16
Joined: 5/27/2003
From: Zoran, ISRAEL
Status: offline