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RE: WACO YMF - 12/16/2011 3:32 PM   
LesUyeda



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From: San Diego, CA, USA
Status: offline 		"I hope this doesn't piss off the purest scale buffs."

Good grief. The valve covers don't even line up with the blisters:-((((((((((((((((

:-))))))))))))

Les

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RE: WACO YMF - 12/16/2011 4:44 PM   
MarvinE255


 

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Status: offline 		I would like an extra large if any are left. Send payment details, as I have not been reading this thread lately. Thanks Marvin WB #53

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RE: WACO YMF - 12/16/2011 4:58 PM   
skylarkmk1



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Status: offline 		Bob,

I may be a stickler for scale (spend too much time taking pictures of full size) but it does not cause me to loose sleep when something is not quite right. For what its worth, the cowls on the framed up birds are crooked. Since the cowls are UMF cowls for a Continental Engine used on UMFs and the #1 cylinder is positioned at 12 o'clock, the cowl should line up with the wide space between bumps at 12 o'clock. The rocker arms on the Continental engine are spaced further apart on the cylinder than the space between the rocker arms on adjacent cylinders. The template included on all of the PICA plans indicates this.

As for the extra bay on the aileron that's not a problem, it will be hardly noticeable. I have seen many full scale Wacos with modifications that were not factory. Jet assisted UPFs, 500 hp Wright 975E&F-2&3 9 cylinder engines stuffed in to a CTO, a Lycoming 9 cylinder in a UPF, home made enclosed cockpits and more. On Wacos with the aluminum aileron, they usually were not changed due to the difficulty in making an extended aileron with the corrugations. Most Wacos were not used for aerobatics although some were used in air shows and many Wacos are rated for basic aerobatics.


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RE: WACO YMF - 12/16/2011 6:54 PM   
mrdhud



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Status: offline 		Hello all,

Good day at the field had three flights and the Waco did really good Robert also had his Waco and had good flights. I think we got some decent videos so some time this weekend I’ll try and edit them down to the important parts (take off & landings) Here’s a couple still shot from the video.


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RE: WACO YMF - 12/17/2011 1:38 AM   
ceije


 

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Status: offline 		dan, robert,
both of you look great and are flying tail HIGH. great to see you both in the air, maybe some day i'll be able to join your birds in flight. in the mean time i'm at the drawing board.
regards,
chris melhus ceije 196

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RE: WACO YMF - 12/17/2011 11:01 AM   
catflyer


 

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ORIGINAL: mrdhud

I all most forgot to tell you the best change I made to the Waco. After weighing all the weight I had in the nose and the weight of the G26 I decided to put a larger engine in her I was able to get more power (that I needed) and remove all the weight I had in the nose. I think your really going to like the sound of this engine.


http://www.youtube.com/user/imperialrcclub?feature=mhee

Okay Day your killing me, what motor is that???

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RE: WACO YMF - 12/17/2011 1:54 PM   
mrdhud



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Status: offline 		OK Guys I guess I have to fess up on the Waco engine. It is a 400cc moki engine only thing is it’s not really in my Waco. I kind of photo shopped the sound track from Scott Prossen’s 29% P47 Razor back on too my video just playing around. This is the same engine that Dave fly’s in his 40% Waco (I think) I’m not much of a practical joker but I couldn’t resist posting the video. (It did sound pretty cool didn’t it)

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RE: WACO YMF - 12/17/2011 2:29 PM   
mogman


 

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Status: offline 		Good one!! Had me going for a while,,I'm thinking what kind of radial makes that sound and fits into that Waco... ...had me searching the internet for small radials...

Cheers,
Dave.
W/B # 180

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RE: WACO YMF - 12/17/2011 5:23 PM   
mrdhud



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Status: offline 		Here’s the video of my three flights. I cut out most of the boring stuff to keep it short. My first landing is pretty bad so any suggestions on how to better my flying will be appreciated. I will get Roberts up next.

http://www.youtube.com/user/imperialrcclub?feature=mhee

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RE: WACO YMF - 12/17/2011 10:01 PM   
mrdhud



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Status: offline 		Here’s Roberts video I got the wrong date on it (dang it)

http://www.youtube.com/user/imperialrcclub?feature=mhee

Whats up with the blue bands??

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RE: WACO YMF - 12/17/2011 11:12 PM   
acerc



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Status: offline 		Dan,
If we could get our ground's keeper to level thing's off it might not be so bad.LOL


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RE: WACO YMF - 12/18/2011 12:49 AM   
mogman


 

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Status: offline 		It's your Florida grass that's faulty!!!

I was greasing the wheel landings up here, but down at M/P the thing was bouncing around like a yo-yo!!!! If you like I'll try to send some good "landing" grass down to you...you're landing problems will be a thing of the past...

Cheers
Dave. W/B # 180

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RE: WACO YMF - 12/18/2011 2:29 AM   
RICKSTUBBZ



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Status: offline 		Dan, Robert,

Thanks for posting the video of your WACO's. I enjoyed seeing them.

For the sake of conversation and/or curiosity, Have either of you tried going up an inch or two in prop diameter and down on pitch an inch or maybe two.

Dan, congrats on the repair. All was looking good in the flights.

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RE: WACO YMF - 12/18/2011 2:45 AM   
acerc



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Status: offline 		Rick, please elaborate on the reasoning for such a consideration.  I'm not much of a prop guy so I'll take any advice available. And thank's. The Waco is a real joy to fly.


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RE: WACO YMF - 12/18/2011 9:18 PM   
pimmnz


 

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Status: offline 		Reasoning goes something like this; slow airspeed, high drag models need a large, slow speed volume of air accelerated for maximum efficiency, low drag models prefer a smaller volume of high speed air. The Waco is a slowish, high drag model, so the biggest prop with a pitch that matches the models airspeed will be more efficient than a smaller diameter, high pitch prop. So each inch of extra diameter you can try an inch less pitch, get/borrow some different props and go flying. The best prop might be something quite unlike the expected size. A wide blade paddle sort will likely work better than a narrow blade. Cut and try.
Evan, WB #12.

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RE: WACO YMF - 12/18/2011 9:42 PM   
acerc



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Status: offline 		Very well put pimmnz. I am picking up a 20-6 tomorrow. From my uneducated calculations that should do the trick. As you have noted an probably noticed in the video our Waco's (at least mine) fly too fast. Yes I know I can cut the throttle but


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RE: WACO YMF - 12/18/2011 11:47 PM   
catflyer


 

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Status: offline 		Wel with the demise of my Cox/Pica ARF and the Pica kit on ebay this past week bringing a premium I picked up a GP ARF and OS 33 at the LHS yesterday but they are wrapped and under the tree till next Sunday. In the mean time I tile printed my 1/4 scale CTO plans and started construction of it this afternoon. I got the three plan sheets printed full sized at a local blueprint shop but I wanted a set to build on and a set to build from so I was able to pick the individule tiles and print them then tape them together and trim out the patterns.

Don't mind the messy work area, thats actually my helicopter bench that I'm starting the fuselage sides on. I'm building a new table in the other room for the CTO wings but haven't quite got it done.

Anyway as of this evening I got the plans all prepared and have 1 of the 1/4" spruce and balsa side framework together. I'm going to make some 1/2" gussets out of 1/32 ply for all of the joints but here are a couple of pictures from today as well as the finished model I'm shooting for.

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RE: WACO YMF - 12/19/2011 1:33 PM   
RICKSTUBBZ



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Status: offline 		Robert,

Evan pretty much hit the nail on the head with his description. I have done a lot of prop experimentation with the planes/engines I have. Albeit none of them are 72” WACO’s powered by 26cc gas engines.

After watching the videos of yours and Dan’s WACO’s-I was curious if you guys had tried different props. The takeoffs and landings are where you would notice the biggest difference in the way the airplane responds to bigger diameter and less pitch. But it will indeed slow the plane down in full throttle cruising. But like you said the throttle stick helps out with cruise speed.

I’ll try not to get long winded here. But here is a little more on the theory…..As we know the bigger diameter prop will slow the engine RPM down in addition to being a bigger fan (more thrust area). The slower rpm will equal less air speed. Having less pitch will actually let the engine RPM go higher as it bites less air per revolution. Therefore, allowing you to go up in diameter without a decrease in RPM.

On takeoffs this helps by moving a wider path of air (bigger diameter) at a lower velocity/speed. It will get your plane rolling and the tail up with less effort and then it will help allow you to roll out on the take off without jumping into the air before you are ready. As they say it is comparable to using a lower gear on your cars transmission. A negative side effect is, at some point the larger diameter and lower pitch will start to show a noticeable amount more left torque during the transition of not moving to getting enough airspeed to fly.

On landings, the bigger diameter less pitch set-up will allow your plane to slow down a noticeable amount while still maintaining a little power at the throttle stick. Less speed with more prop wash to maintain a positive feel on the controls. Also you will probably notice an increase in prop breaking action when you pull the stick to idle. As in the back side of a loop.

As a word of caution, if you experiment in this direction, be even more careful with nailing the throttle while at a low air speed because the engine/prop torque will definitely increase. Wing loading also makes a difference on how an airplane responds to these changes. Also do not expect brand “X” 18X6 prop to be the same as brand “Y” 18X6 prop. In most cases the only thing that will be common between them is the diameter.

Sorry for the long post. If you guys experiment with the props I would like to read about the results. Good luck.


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RE: WACO YMF - 12/19/2011 1:51 PM   
bhall01



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Status: offline 		   Dang - I just looked up that 1/5th scale Pica kit that was on ebay..... apparently they are starting to go for a premium price indeed!

   I have the same Pica kit that I've been planning on listing somewhere when I got around to it - probably here on RCU rather than ebay.  Don't really plan on building the 1/5 scale anymore since I am working on a Barth 1/4 scale Waco.  I had  the 1/6th scale Pica Waco for a lot of years and enjoyed the heck out of it.  Let someone talk me out of that one and decided to up-size to the 1/5th scale so I bought a kit.... 'life' got in the way and it didn't get built,  then along came the 1/4 scale and I decided to go that route as over the ensuing years I've gotten into larger models.

   Anyway, the kit is NIB... opened a couple times to look, but that's it.  Been stored in my shop/basement under climate controlled conditions, so it is definitely in "as new" condition.  Any interest out there at a fair price?

  
  Merry Christmas to all -

Barry

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RE: WACO YMF - 12/19/2011 2:22 PM   
rob v


 

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Status: offline 		hey .... how much?


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RE: WACO YMF - 12/19/2011 2:46 PM   
bhall01



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Status: offline 		   Okay, apparently there's interest.  Got a 'PM' already asking about pricing, but I guess I should respond here as well.

    I was planning on pricing at $350, plus shipping, based on RCU's 'Blue Book' prices.  Unless someone really wants to pay out $500+ like on ebay!    Not one to turn down a good price, but that's just nuts!


   Cheers -

Barry

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RE: WACO YMF - 12/19/2011 2:52 PM   
mrdhud



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Status: offline 		Evan & Rick,

Thanks for that highly understandable explanation on prop / pitch theory. This subject has always gone over my head before now it makes more sense to me. I would like to hear more about APC verse wood props.
Glade you enjoyed the videos.

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RE: WACO YMF - 12/19/2011 5:14 PM   
catflyer


 

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quote:

ORIGINAL: bhall01

   Okay, apparently there's interest.  Got a 'PM' already asking about pricing, but I guess I should respond here as well.

    I was planning on pricing at $350, plus shipping, based on RCU's 'Blue Book' prices.  Unless someone really wants to pay out $500+ like on ebay!    Not one to turn down a good price, but that's just nuts!


   Cheers -

Barry

Had you cam along with this Saturday before I drove to the LHS and dropped almost $1000 for the GP ARF and OS 33gt motor (along with enough wood for my 1/4 scale CTO) I would have jumpped all over it since I had a bid of $350 plus shipping on the flebay one last week.

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RE: WACO YMF - 12/20/2011 3:32 PM   
Stickbuilder



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Status: offline 		Mitch,

Received the shirts yesterday. Thanks. I think that we need to really try to get the artwork disk from Jay and maybe do a little tweaking on the shadowing on the large transfer. It worked great with the tan shirts, but the color doesn't seem to work well with other colors. They are nice, but I'm hoping that we can come up with something that makes the picture look a little more realistic.

Bill, Waco Brother #1

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RE: WACO YMF - 12/20/2011 4:51 PM   
yel914



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Status: offline 		I've noticed that the first run tan shirt is more comfortable to wear than the burgundy second run shirt. I think it has something to do with the size or bulk of the large transfer on the back of the shirt. Or is this just me?

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