Jim Pepino's YMF-5 Waco  
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All Forums >> RC Airplanes >> Scratch Building, Aircraft Design, 3D/CAD >> Jim Pepino's YMF-5 Waco
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Jim Pepino's YMF-5 Waco - 2/21/2006 2:35:21 AM   
beepee


 

Posts: 737
Joined: 2/8/2002
From: Houston, TX, USA
Status: offline 		I just today picked up a complete 1/4 scale Waco built from Pepino's plans, Its got a 90" W/S and I would estimate it weighs in at about 27# with a Quadra 50 in the nose. Unfortunately, I did not get the plans. Does anyone know what the CG location should be. The incidences? Control throws?

Would appreciate any help I can get.

Thanks,

Bedford
       Post #: 1

RE: Jim Pepino's YMF-5 Waco - 2/22/2006 2:38:58 AM   
SilverEagleBW


 

Posts: 418
Joined: 10/17/2003
From: Pittsburgh, PA, USA
Status: offline 		I have the plans in my archives here somewhere,,gimmie a day or so and i'll look that up for you.

(in reply to beepee)
       Post #: 2

RE: Jim Pepino's YMF-5 Waco - 2/22/2006 12:54:02 PM   
beepee


 

Posts: 737
Joined: 2/8/2002
From: Houston, TX, USA
Status: offline 		Thanks SilverEagle. Did you build it? I would appreciate any comments you may have about flight and handling. Would lilke to discuss the possibility of buying a copy of the plans from you.

We are still in flying season around here, which runs from September 1 to August 15th, but the weather doesn't look too good for any test flying this weekend. Patience, patience.

Bedford

(in reply to SilverEagleBW)
       Post #: 3

RE: Jim Pepino's YMF-5 Waco - 2/24/2006 7:49:13 PM   
SilverEagleBW


 

Posts: 418
Joined: 10/17/2003
From: Pittsburgh, PA, USA
Status: offline 		The CG is 1 9/16 in front of the leading edge of the bottom wing,,,,,,,,

(in reply to beepee)
       Post #: 4

RE: Jim Pepino's YMF-5 Waco - 2/25/2006 12:15:58 PM   
beepee


 

Posts: 737
Joined: 2/8/2002
From: Houston, TX, USA
Status: offline 		Great! Thanks, SilverEagle.

Bedford

(in reply to SilverEagleBW)
       Post #: 5

RE: Jim Pepino's YMF-5 Waco - 10/3/2006 6:03:06 PM   
Big_Bird



Posts: 3237
Joined: 12/18/2001
From: Arlington, TX, USA
Status: offline 		Bedford, do you happen to have any photos of your YMF-5 that you could post here? Did you fly it? What engine?

_____________________________

Ken
WACO Brotherhood #70

(in reply to beepee)
       Post #: 6

RE: Jim Pepino's YMF-5 Waco - 10/4/2006 1:03:08 PM   
beepee


 

Posts: 737
Joined: 2/8/2002
From: Houston, TX, USA
Status: offline 		Hey, Ken, good to hear from you.

I have not done much with it since ... working on other projects. I have not flown it yet, but will soon. It has a Quadra 50 in the nose that I have not run, but feels like it has good compression.

I have to get some pictures sometime. I always do before first flight. Don't want to jinx it.

I saw you fly your B-J at Bomber. As usual, nicely done. Sorry I did not get over and say high. I think it was too hot to move!

Bedford

(in reply to Big_Bird)
       Post #: 7

RE: Jim Pepino's YMF-5 Waco - 10/4/2006 3:23:45 PM   
Big_Bird



Posts: 3237
Joined: 12/18/2001
From: Arlington, TX, USA
Status: offline 		Looking forward to the photos Bedford.

I have ordered the plans and Craig at Fiberglass Specialties sent me these photos of the cowl and wheel pants. I plan to use a G-62.

I had a great time as usual at Bomber Field even though I lost my Corsair. The receiver died. Someone stole about half of the plaques so I didn't get mine at the awards ceremony. Nick Stratos said that they have been reordered.

Ken

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_____________________________

Ken
WACO Brotherhood #70

(in reply to beepee)
       Post #: 8

RE: Jim Pepino's YMF-5 Waco - 10/6/2006 12:32:25 PM   
beepee


 

Posts: 737
Joined: 2/8/2002
From: Houston, TX, USA
Status: offline 		I am thinking about a G62 as well. I will see how she does with the Q50 and then decide. Some of our Club members have G62s looking for an airframe to pull around. I don't think I will suffer a weight penalty as the plane was badly tail heavy when I got it (one of the causes for my delays). I have had to add at least a pound of nose weight to get it in line. A heavier engine would be nothing but a plus.

Will keep you posted.

Very sorry about your Corsair. Fortunately I missed the incident.

Bedford

(in reply to Big_Bird)
       Post #: 9

RE: Jim Pepino's YMF-5 Waco - 10/6/2006 4:01:39 PM   
Big_Bird



Posts: 3237
Joined: 12/18/2001
From: Arlington, TX, USA
Status: offline 		The G-62 would be a very good engine for the plane. Also the Zenoah GT-80 would be a good choice. I would like to find one at a reasonable price.

Are you going to Austin on the 14 & 15 for the Hill Country Flyers big bird flyin? I plan to be there.

_____________________________

Ken
WACO Brotherhood #70

(in reply to beepee)
       Post #: 10

RE: Jim Pepino's YMF-5 Waco - 10/7/2006 2:19:04 PM   
beepee


 

Posts: 737
Joined: 2/8/2002
From: Houston, TX, USA
Status: offline 		I should go to Austin, but I am trying to prepare for Space City's cross country event the following weekend. My daughter lives there and we don't get to see her near enough.

I have a great source for YMF-5 3 view that I will send you on Monday ... I have it in my office.

Bedford

(in reply to Big_Bird)
       Post #: 11

RE: Jim Pepino's YMF-5 Waco - 12/19/2006 7:20:26 PM   
SuperCub Man



Posts: 331
Joined: 9/29/2002
From: St. Catharines, ON, CANADA
Status: offline 		Bedford - I am building one of those beautiful Wacos from Pepinos plans. He includes an awful lot of spruce in the fuse. Anyone find this a little over-kill or does it require this for the Quadras and Zenoahs. Could it be lightened by using more balsa? My buddies here urge me to build for flying - not crashing! I'd like to use a Quadra 52 with CH Ignition I have on the shelf, so it needs to be kept light!

James

_____________________________

Jim, MAAC #5343
WACO Brotherhood #56

(in reply to beepee)
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RE: Jim Pepino's YMF-5 Waco - 12/19/2006 9:26:05 PM   
Big_Bird



Posts: 3237
Joined: 12/18/2001
From: Arlington, TX, USA
Status: offline 		I have a good friend who built the Pepino YMF-5 back in the late 1980s but never finished it. While I was over at his house a few days ago he dug it out of his attic. The fuselage without tail feathers or landing gear weighed 4.5 pounds. It was built with all spruce per the plan call out for a plane with a greater than 1.8 cu-in engine. It was hard to believe how heavy it was. I believe you could grasp it by the tail and use it for a soft ball bat. I think by substituting medium balsa for the spruce you could save at least 2 pounds if not more. That's what I'm going to do and I plan to use a Zenoah G-62. There are so many cross braces and gussets that the plane will be very strong without all of the spruce. I do plan to use spruce in the wings as called for.

At this point I have all of the ribs built and all of the metal wing pieces built. I have done a lot of modification to the plans to correct obvious errors. The plans call for the bottom wing incidence to be 0 degrees, the top wing to be +2 degrees and the stab to be +2 degrees. The only one of these numbers that I disagree with is the top wing incidence. I think it should be -1 degree. That's the way I am doing mine unless I get my mind changed. Another friend built 3 of these planes. The first one had +2 degrees on the top wing and it flew terrible until he took the 2 degrees out. It took off like a home sick angle and any time you changed engine RPM the pitch changed drastically.

These plans are pretty poor in several respects. For instance, look at the top wing drawing on the fuselage side view sheet. See how the trailing edge of the wing center section curves up. Now look at the rib for the top center section. It curves down. The bottom wing on the fuselage side view does not match at all the actual wing shape. I'm enclosing a couple of photos to show you what I mean.

Note: for the lower wing to fit up into the fuselage, a considerable amount of wood will have to be cut out of the lower 3/8" x 3/8" crutch member. This means that an additional 3/8" x 3/8" piece needs to be glued above the this long 3/8" x 3/8"piece. The 3 views show that stringers run from the landing gear to the tail. If built by the plans the lower wing will hang somewhat below the fuselage saddle and can not be streamlined into the fuselage.

If you start comparing a rib drawing in one place it does not begin to fit the same rib in another place. Drafting precision was not one of Jim's strong suits.

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< Message edited by Big_Bird -- 12/19/2006 9:49:12 PM >

_____________________________

Ken
WACO Brotherhood #70

(in reply to SuperCub Man)
       Post #: 13

RE: Jim Pepino's YMF-5 Waco - 12/20/2006 2:47:07 AM