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Author Topic: ARF Score  (Read 10733 times)

Offline Matt Piatkowski

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ARF Score
« on: July 07, 2015, 03:39:46 AM »
Hello,
This ARF was collecting dust in one of the Hobby stores in Toronto, Canada and I bought it at the bargain price.
I have read the discussion about Score ARF falling apart in the air published on this forum and will do the following:

1. reinforce/rebuild the nose using slow epoxy and carbon cloth. Alternatively, I was thinking about installing the classic hardwood crutch beams, tapered and with lightening holes.
Which one is a better choice?

2. Check the leadouts, the belcrank mount and the pushrod.
Replace the leadouts and reinforce the bellcrank mount and the pushrod attachments (?).
What is the least intrusive way of doing these? How to attach the new leadouts to the bellcrank when it is already glued into the wing. I will open the sheeting on top and the bottom of the wing but the access seems to be limited and difficult. The same may (?) pertain to the pushrod surgery.

I hope somebody that have done it in the past will advise me.

Also: I have two engine choices; Jett 60 ( not BSE Ro-Jett 61 but Jett 60 with the cast crankcase modified by George Aldrich and resurrected by Dub Jett last year) with the header ending with custom made muffler and Evolution 60 NX R/C modified for C/L with the custom made muffler. Both engines weight 12.6 oz. without header, mufflers and propellers. The entire power plants ( engine with header/ and mufflers and wooden prop ) weight ~ 15 oz.

The weight of the ARF "out-of-the-box" now is 50.6 oz. I will remove some weight by not making this model disassemblable ( removal of the  mounting screws and dowels; I will remove some plywood too) but some weight will be added during reinforcements of the front. Total estimated weight RTF w/o fuel =~66 oz. - rather on the heavy side for the model of this size.

Comment: I do not compete yet - just learning the pattern. If I can get 5.3-5.4 seconds laps on 66' lines with decent tension, I believe the entire effort will pay off.

The engines have the same mounting screw pattern and I intent to run them with low launch RPM ( possibly around 8,000 ) with slightly higher pitch ( 12.75 x 5 or 6 Zinger cut from 14 x 5 or 6 to get wider blades ) as they have plenty of power for the plane of this size.

Your comments, suggestions and friendly critique is appreciated.

Thanks,
Matt






Offline Shug Emery

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Re: ARF Score
« Reply #1 on: July 10, 2015, 02:04:04 PM »
I just picked up a Score myself. Missing control horns and a few minor parts. $25!
I too will beef up nose and do a fixed landing gear to fuselage as I heard the wing mounts for landinggear are weak.
Gonna leave the bellcrank and leadouts as they are at this point.
Have a Randy Smith Aeroproducts Magnum .52 to put on it.
Good luck to us both.
Can't wait to get it done and fly.
Shug




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Offline Dan McEntee

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Re: ARF Score
« Reply #2 on: July 10, 2015, 04:37:44 PM »
    I got my Score already assembled and modified by Crist Rigotti. I had the nose fall off mine in mid flight at Oshkosh a few years ago. All the slot and tab joints just came apart. The hot melt glue is the problem. I could peel it off like rubber cement. I cleaned off all I coul, re-assembled using C/A glue and epoxy along with an extra gusset or two here and there. Then I coated the whole works with brushed on thinned epoxy to fuel proof. Mine has a Saito .56 in it using the stock R/C type mounts. I have no problem with this style of mounting. If it makes it easier for you to put together, just try and pick and peel as much of the original glue off as you can. Then flow thin C/A where ever you can. When finished there and if it seems nice and solid, then coat the whole thing with thinned epoxy. I noticed flying mine after the repair, that I could feel engine vibrations down the line at the handle, quite normal for a large model, and I never did before. That's how rubbery and "loosie goosie" the front end was before it fell apart. As for engine, use whatever you desire. Flip a coin if necessary. That is one advantage of the R/C type engine mount, you can always easily change out the engine. I would go for as much power as possible. Mine weighs 72 ounces, but flies better than I can fly it, and it carries the weight very well. I have an extra one put away that is missing parts that I bought just for the wing. Very nice airfoil, whatever it is.
  Good luck and have fun,
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Offline Matt Piatkowski

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Re: ARF Score
« Reply #3 on: July 10, 2015, 05:43:03 PM »
Hi Shug,
What is the weight of your engine as shown on the photograph?

I have found the weight of the stock Magnum 52 without big stock muffler but with the R/C carburetor ( ~ 1.5 oz. ) and it is 13.6oz (374g).

As your Magnum has the customized Teflon C/L venturi with the spray bar and smaller muffler, the total weight should be around 13 oz. Am I right?

I feel that the main problem with Score and other ARF is too much hot glue that is quite heavy, weak and not easy to remove. Perhaps the front of Score should be heated with the heat gun, disassembled, cleaned, glued with epoxy and re-cover?

Dan,
You only confirmed that the re-work is a must.

Please see the attachment. Both engines have the same mounting screws pattern and will be mounted sideways ( heads pointing outside the circle ).
I do not like to flip stunters "belly up" while starting the engine and the head sideways allow me to easily start the engine being alone, walk to the handle and remotely release the plane from the "launch pad".

Happy flying,
Matt

 


Offline Shug Emery

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Re: ARF Score
« Reply #4 on: July 10, 2015, 06:55:25 PM »
Hi Shug,
What is the weight of your engine as shown on the photograph?

I have found the weight of the stock Magnum 52 without big stock muffler but with the R/C carburetor ( ~ 1.5 oz. ) and it is 13.6oz (374g).

As your Magnum has the customized Teflon C/L venturi with the spray bar and smaller muffler, the total weight should be around 13 oz. Am I right?

I feel that the main problem with Score and other ARF is too much hot glue that is quite heavy, weak and not easy to remove. Perhaps the front of Score should be heated with the heat gun, disassembled, cleaned, glued with epoxy and re-cover?

Dan,
You only confirmed that the re-work is a must.

Please see the attachment. Both engines have the same mounting screws pattern and will be mounted sideways ( heads pointing outside the circle ).
I do not like to flip stunters "belly up" while starting the engine and the head sideways allow me to easily start the engine being alone, walk to the handle and remotely release the plane from the "launch pad".

Happy flying,
Matt

The Magnum is 13.95 ounces. It is a lightweight Aero muffler.shug
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Offline Dan McEntee

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Re: ARF Score
« Reply #5 on: July 10, 2015, 11:29:44 PM »
  And just as a side note, I glued my wing in solid also. It was OK for the first couple dozen flights, but then I could feel some looseness in the wing joint, so I just went ahead and epoxied it in. It's a big airplane, but not really a take apart, so no reason to rely just on the plastic bolts and a wooden dowel.
   I haven't had mine out yet this year. Gotta do that soon.
    Type at you later,
     Dan McEntee
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Offline Matt Piatkowski

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Re: ARF Score
« Reply #6 on: July 11, 2015, 01:09:34 PM »
I should be done with all reinforcements and assembly in about 2 weeks and then I will fly this thing using both engines.
I will keep everybody posted.
Regards,
Matt

Offline Brett Buck

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Re: ARF Score
« Reply #7 on: July 28, 2015, 11:10:49 PM »
    I got my Score already assembled and modified by Crist Rigotti. I had the nose fall off mine in mid flight at Oshkosh a few years ago. All the slot and tab joints just came apart. The hot melt glue is the problem. I could peel it off like rubber cement. I cleaned off all I coul, re-assembled using C/A glue and epoxy along with an extra gusset or two here and there.

   I haven't built any of the CL ARFs, but I helped a coworker assemble an RC ARF after a minor problem (not with the fuselage). Interestingly, most of the beefing up was around the firewall (*maple* gussets, for example), and when he test-ran it after the fixed, it picked up something like *2000 rpm* compared to what it could do before. This was legitimate, I measured it before and after myself. It didn't look too bad before, and it wasn't about to fall apart,  but clearly it was soft.

    Brett

Offline Brett Buck

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Re: ARF Score
« Reply #8 on: July 28, 2015, 11:11:12 PM »
    I got my Score already assembled and modified by Crist Rigotti. I had the nose fall off mine in mid flight at Oshkosh a few years ago. All the slot and tab joints just came apart. The hot melt glue is the problem. I could peel it off like rubber cement. I cleaned off all I coul, re-assembled using C/A glue and epoxy along with an extra gusset or two here and there.

   I haven't built any of the CL ARFs aside from helping Ted with his strega, but I helped a coworker assemble an RC ARF after a minor problem (not with the fuselage). Interestingly, most of the beefing up was around the firewall (*maple* gussets, for example), and when he test-ran it after the fixed, it picked up something like *2000 rpm* compared to what it could do before. This was legitimate, I measured it before and after myself. It didn't look too bad before, and it wasn't about to fall apart,  but clearly it was soft.

    Brett

Offline tom brightbill

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Re: ARF Score
« Reply #9 on: July 29, 2015, 08:10:08 AM »
Matt,
" Check the leadouts, the belcrank mount and the pushrod.
Replace the leadouts and reinforce the bellcrank mount and the pushrod attachments (?).
What is the least intrusive way of doing these? How to attach the new leadouts to the bellcrank when it is already glued into the wing. I will open the sheeting on top and the bottom of the wing but the access seems to be limited and difficult. The same may (?) pertain to the pushrod surgery."

Glue light string/carpet thread to the leadouts before removing the bellcrank, pulling them through when you remove the bellcrank.  remove them from the old leadouts and reglue to your new ones, and pull them back out as you eventually fit the new bellcrank into position.
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Offline Chris Fretz

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Re: ARF Score
« Reply #10 on: June 16, 2016, 06:42:11 PM »
I just picked up a Score myself. Missing control horns and a few minor parts. $25!
I too will beef up nose and do a fixed landing gear to fuselage as I heard the wing mounts for landinggear are weak.
Gonna leave the bellcrank and leadouts as they are at this point.
Have a Randy Smith Aeroproducts Magnum .52 to put on it.
Good luck to us both.
Can't wait to get it done and fly.
Shug





You know it's funny I saw a Score for sale on Craigslist in Akron/Canton that they are using this same picture to advertise it!
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Offline Shug Emery

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Re: ARF Score
« Reply #11 on: June 16, 2016, 06:50:57 PM »
You know it's funny I saw a Score for sale on Craigslist in Akron/Canton that they are using this same picture to advertise it!
Intriguing)))) Too funny.
Shug
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