RE: World Models .60 size P-51 Mustang--Petie 2nd version (Full Version)

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cruzomatic -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/6/2005 12:13:20 AM)

For those who have a Saito 120 in there P51's. I having a tough time getting my stock spinner to fit on mine. Am I doing something wrong? The little brass flange that goes inserted in the back plate is too small to fit over the crankshaft. Please advise.



taildraggerdave -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/6/2005 2:02:32 AM)

Take a reamer and ream out the brass bushing until it just fits over the crankshaft. You could probably drill it also but be careful about making the hole too big. I used the stock spinner for quite a while. It works well.



cruzomatic -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/6/2005 2:39:11 AM)

Thanks for chiming in Dave. I'm almost done with it. [:D]



viper21 -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/6/2005 3:27:25 AM)

Dave and Cruz, just a regular stock prop reamer will open the brass bushing just fine?
I have my retracts and Robo Struts ordered and they should come in next week Monday or Tuesday so I can install them I will shoot some pictures of the install I even ordered the 3.5" Robart wheels hopefully I wont need to do allot of cutting but I bought a roll of silver Ultracote incase I needed to cut up some of the wing.
Viper



taildraggerdave -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/6/2005 3:36:45 AM)

I use a tapered reamer that continually gets larger in diameter, not a conventional 3 step prop reamer. What you will end up with is a brass bushing with a "V" in it. I ream it equally from both sides. When you bolt it down behind a prop it is not going to go anywhere---some say the entire length of the of the hole has to be the same diameter, but I don't think it is really that big of a deal...now on my props I like to have a consistant diameter on the mounting hole.....



rare_bear -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/6/2005 4:03:55 AM)

here's what's left to do on my plane:


hook up the remote glow driver
connect the engine fuel filters/check valve
install the pilot figures
install canopy
bottom air scoop & wing strap
install wing & check fit
route receiver antenna
position & mount batterey as CG get's checked


that's about it [:D]
oh yeah, put on the decals


this is an excellent kit & my first world models kit. i'm impressed with the quality and ease of construction. the only mods i did were to beef up the firewall joints, move the fuel tank to the CG, and reinforce the landing gear with eopxy & fiberglass. i may exchange out the landing gear pushrods for 4-40 rods & ball joints but that is TBD.

i think my next kit will be the new world models 60 sized extra. edwin just got some in and they look awesome.



viper21 -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/6/2005 4:23:49 AM)

Dave, I have never seen a non stepped prop reamer where do I get a tapered reamer I just have the stepped type. If I understand you correctly your saying that both sides of the reamed hole come to a "V" wont the spinner backplate wobble on the prop shaft? I have always used a regular 4 step Fox prop reamer and have never had a problem am I missing something with reaming the backplates and props all mine have the holes the same diameter the entire cut in the backplate or prop?
Thanks Dave
Viper



taildraggerdave -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/6/2005 4:47:51 AM)

Your reply is indicative of what most people think......how can the backplate wobble when it is securely clamped between the engine thrust washer, the prop, the washer, and the 2 nuts to tighten the whole mess down?????? The smallest diameter is in the center of the backplate and that is supposed to be an exact fit over the crankshaft. The reamer can be purchased at most any hardware store. I believe it is for dressing pipe.



viper21 -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/6/2005 7:19:09 AM)

Dave, I think I understand by using a stepless reamer the hole is round all the way through? I will look for the stepless reamer at Home Depot in the plumbing Department. One question how do you know not go to far if there are steps on the reamer like my Fox Reamer has?
Thanks Viper

PS: I made a trade for a new rebuilt YS 140 It was rebuilt by YS and they replaced the piston and liner, new bearings, new pump diaphram and more I have the receipt and all the old parts. YS said they adjusted the punp and they set the low end needle. So now I need a plane for it? I wonder if H9 is going to bring out a 150 size Miss America Mustang. It should pull the Mustang around pretty well[:D][:D]



cruzomatic -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/6/2005 2:14:21 PM)

What about the jam nut or the nut that the spinner screw mounts to the crankshaft? It didn't fit on the crankshaft either?



taildraggerdave -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/6/2005 3:00:59 PM)

You'll have to go buy an adapter kit from Tru-turn or Dave Brown. Comes with a new washer and an extension piece that has 10mm threads for the crankshaft and 10-32 threads (I think) for the spinner end. Then, you need to find the correct allen head screw for that. I used a normal phillips head screw and it sat on top of the spinner. The allen head screw would be recessed and look better.....



cruzomatic -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/7/2005 6:25:14 PM)

Okay, thanks again.



rare_bear -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/12/2005 1:18:14 AM)

Dave, I have a theory about how your elevator control horn fractured... read on...


Today, I got my Mustang all put together and just sort of laid the radio and battery in position but didn't worry about routing the antenna and fixing the location of the battery pack just yet because I only went to the field to break in my new engine. All well and done.

What I did notice was that because I did not use the anti-vibration mount fixture (or any other kind of anti-vibe engine mount), i saw a huge resonance buildup around the engine midrange (somewhere between 3000-5000 rpm's) which made the elevator resonate around 30 Hz or so with roughly 1/2 inch peak to peak excursion. At idle and full engine speed, the resonance diminished but I took not of the mid-range resonance. This is all quite natural because everything exhibits resonance modes.

Well anyway, when I finished up engine break-in, i took apart the plane to pack up and i noticed that the screw that holds the elevator servo control arm had worked loose. The screws that hold on the air scoop alsp worked loose but I'd expect those to. Not the elevator servo however as the control arm screw had a lock washer on it as well.

This made me start to think that the elevator resonance simply travels back through the pushrod and the servo takes a direct hit with vibration. Not good - as this can lead to servo gear stripping with time.

This could also be the source of your control horn failure Dave. Who knows. How many flights do you have on your bird anyways when you noticed the control horn crack?

Well anyway, I think I will spend a little extra time before a maiden voyage and install an anti-vibe engine mount that Gator RC sells. I have one on my Staudacher powered by a YS110 and it works extremely well.

I'd rather be safe than sorry :)

By the way, I ditched the factory furbished pilot figure and went with sponge bob as the captain with patrick up against the rear of the cockpit looking like he's ready to puke - hehehehehehe



viper21 -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/12/2005 3:00:04 AM)

RB, I am mounting my new OS 120 on the stock anti vibration mount in my Mustang I don't how the Gator RC mounts work but I will try the stock mount. Was there a reason that you didnt use the stock antivibration mount in the kit? I know its of the same type as the mounts that World Models uses in their pattern kit so I would think it should hold up well enough to a 120? I will try it out and let you know how is works I am waiting for my Robart retracts and Struts to come in. I need my muffler yet. I am looking forward to flying mine.
Now I wish Hangar 9 would bring out a 150 size Miss America Mustang. I have YS 140 jut waiting for one[;)][:D][:D]
VIper



rare_bear -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/12/2005 3:09:37 AM)

I was just copying a few other folks who built it stock without the anti-vibe mounts and have been flying it awhile. No big deal to remove the engine and mount and retro to a Gator. For reference, here is a link:

http://www.gatorrc.com/

click on 'soften-safe .40-.91 mount' or 'soften-safe 120/140' under 'gator accessories'

post edit:
i just returned from the bedroom to take a 2'cd look at the supplied anti-vibe kit. i think it's worth a try over going with a gator type mount. after all, it conforms to my laziness as i don't have to drill new mounting holes in the firewall. i'll give it a shot and see how well it dampens. the screws that clamp the engine seem sort of small.



MustangAce -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/12/2005 3:35:49 AM)

This is a little off subject but check out this video of Petie 2.

http://home.comcast.net/~shaneorr/Slow_Flyby.AVI



MustangAce -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/12/2005 3:38:06 AM)

this one too

http://home.comcast.net/~shaneorr/Highspeed_Pass.AVI





viper21 -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/12/2005 3:52:15 AM)

Very Cool Dave, she sounds and looks great[;)] I hope to have mine flying in the next couple of weeks I am waiting on my stuff to finish the plane
Joe



taildraggerdave -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/12/2005 5:45:26 AM)

Interesting observation about the resonance. I'm pretty sure that YS will shake more than the Saito, though. Either way, I have probably 50 somethng flights on the plane. Not really sure. I've had it for quite a while now. Glad to hear yours is almost ready to go. I won't be at the field this weekend due to the scheduled events. Will see you next weekend and maybe we can enjoy some formation flight........



rare_bear -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/13/2005 3:11:34 AM)

i installed the mounts today without the outer brass collars. you have to loosen up on the screws because they squish out the silicone and make the mounting holes longer than the pre-drilled mounting holes on the mount. then you have to cinch down the nuts and grag the screws to keep them from turning as they now have no access.

anyway, i took it back out. i plan to go with gator mostly because i have used that mount before and like it better in comparison. personal preference.

by the way, gator also sells a mount just like the one in this kit. it is of good quality but i think they sized the brass collars wrong on the outer screws that connect the silicone to the mount. the inside diameter of the collar is smaller than the outside diameter of the screw.



viper21 -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/14/2005 12:04:50 AM)

RB, I haven't mounted my Surpass 120 yet I was planning to use the stock antivibration mount but since I haven't mounted my 120 to it yet so I dont really have an answer for you? I read the directions and looked at the diagram for the mount and it looks as if it should work. I know of a couple of guys that use the same mount in their WM Pattern planes? I dont know maybe its because of the size of your engine I will find out when I start my plane I haven't started because my Robart retracts and struts are on backorder.
I am going to look at the Gator rc mounts but I am going to try the stock mount first and will let you know how it works.

As for the brass collets that run through the vibration pad if the fit is too tight in the vibration pad than maybe they are crushing the brass collars running through them? Sorry I don't have any better ideas, Maybe one of the guys on this thread can help out?? I am sure that someone in this thread or forum has used the stock mount
Viper



viper21 -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/18/2005 7:17:31 AM)

Well, I am still waiting for my Robart 550RS retracts, air kit and Robo Struts I emailed Quantum and they called Robart today whi said they are building my retracts and struts[:o] So Quantum might get them next week and then I will get them I guess at this rate I could have built my Top Flight 1/5 kit or at least have it framed up[X(] I think that I will have to use the stock muffler on my Surpass 120 because I dont think a inverted pitts will fit in the cowl.

RB. the new Fly RC has a World Models ARF with the anti vibration mount and it looked pretty straight forward it seems as if its a good system the had Super Tiger 90 and it worked well or at least it looked functional.
Did you ever the problem worked out on your Mustang? I will give it a try with my 12o Surpass and let You how it works out
Viper



rare_bear -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/18/2005 5:31:55 PM)

viper, i am using the gator mount. since i have a 120 size mount on-hand, i modified it at work today to fit the ys110 crankcase width. the isolators are a piece of cake to swap out when that time comes, and the whole mount weighs less than the stock mount + stock isolators. the only thing i have to do is redrill the mounting holes in the firewall by plugging the existing ones with a dowel+epoxy, redrilling to the corrct layout, and install the blind nuts. no big deal. what it all boils down to is whether i am satisfied with what i have built. i will also be changing out the torque pushrods on the landing gear but that will be at a later point in time. i'll maiden this plane when i feel it's ready and when i feel ready myself. i actually did install the stock anti vibe mount on the mounting arms but i had to file down a few of the metal pieces to fit on the ys110 without rubbing. in order to get the large mounting screws through the stock mount pre-drilled holes, i had to loosen up the two (two of four) countersunk screws so that the absorber material would not squeeze outward and add additional distance from mounting hole to mounting hole. then when all was fitted together, i would tighten down on the self locking nuts. to keep the counter sunk screws from spinning (you no longer have access to the phillips slot), i would have to grab onto the screw end with a pair of dikes and then tighten the nut. at that point, i decided not to proceed because i would screw up the threads. that is when i decided on going with the gator system. i am sure the stock system would work fine - just not what i want to do tho as a matter of personal preference.



viper21 -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/19/2005 1:18:14 AM)

Wow RB, Since I am planning to use the stock motor mount with OS 120 I hope that I don't have the problems you did with the stock mount as I plan to use it. I really hope that it works okay I dont want to have to buy a new mount for my plane so I will give it a shot. And after seeing an assembled mount and engine in the magazine I think it should work if the engine lugs are not too long for the mount., I will let you know how it works out.
Thanks for the help.
Viper



rare_bear -> RE: World Models .60 size P-51 Mustang--Petie 2nd version (3/19/2005 2:42:26 AM)

what's keeping you from trying it out tonight or this weekend? you sure don't need to get the late-to-arrive landing gear installed to check out the engine mount configuration. correct me if i'm wrong, you have your engine, right? anyway, i should be able to do a maiden flight 2 weekends from now.... would prolly be able to next weekend but we'll be out of town for the easter bunny.



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