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Super Skybolt ARF

Old 09-15-2015, 02:03 PM
  #851  
LSP972
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Originally Posted by damifino View Post
. When I take it to the field it gets flown 3 or 4 times every time.
You've probably got the most 'Bolt experience in this thread, so I'll ask you.

I plan to get one, and am hoping that my Laser 150 will fit in there. It should, as it was a perfect match for the Goldberg Ultimate, but… that puppy swings a 16" prop.

Am I going to have ground clearance problems with the stock LG?

.
Old 09-16-2015, 04:00 PM
  #852  
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Well, okay… ANYONE here still flying this model?

Looks like my Laser is not going to fit, especially after I add a supporting firewall. New engine choices are sparse, for sure. I'm leaning toward a Saito, probably the 1.25. Again, I'm concerned about prop clearance.

.
Old 09-16-2015, 04:23 PM
  #853  
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I'm still flying my Skybolt nearly every weekend. Mine, powered by an OS 91 S2, has more than enough power for anything I want to do. My question is, why would you want to take a 7 lb airplane and turn it into a 10 lb airplane? Mine, swinging an APC 13.5X9, has roughly 2" of ground clearance. A Saito 1.00 would be about as large an engine as I would recommend.
Old 09-16-2015, 04:26 PM
  #854  
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Oh, one more thing. With the OS 91 and a 6v battery mounted up front under the fuel tank required no added weight to balance. AUW is around 7.5 lbs. It flys great and lands like a Senior.
Old 09-16-2015, 04:29 PM
  #855  
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Well.........ok. Maybe not a Senior but it is my most agile bi-plane and landings are a dream.
Old 09-16-2015, 05:24 PM
  #856  
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Originally Posted by KaP2011 View Post
My question is, why would you want to take a 7 lb airplane and turn it into a 10 lb airplane?
I don't. Where do you get those three pounds from? The larger engines I am discussing are, at most, a half-pound heavier than an OS 91 Surpass (which I have, but in another model) and, I presume, a Saito 1.00.

But you're right, the 15"-16" props those engines require would simply not work with the stock LG. Which is what I suspected. Your information confirmed it; thanks.

Regarding the firewall… did you reinforce yours by adding a second thickness of real plywood, as detailed way back in this thread? I have no doubt that some additional fuel proofing will be needed, and perhaps some tri-stock here and there. But slapping on another firewall over the existing one is pretty… severe. Necessary, you think? Or not?

Off to check out the Saito 1.00...
.
Old 09-16-2015, 05:50 PM
  #857  
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Still flying mine with an OS 95V, lots of great compliments at the field and still looks and flies as nice as it did when new
Old 09-16-2015, 10:50 PM
  #858  
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Originally Posted by LSP972 View Post
I don't. Where do you get those three pounds from? The larger engines I am discussing are, at most, a half-pound heavier than an OS 91 Surpass (which I have, but in another model) and, I presume, a Saito 1.00.

But you're right, the 15"-16" props those engines require would simply not work with the stock LG. Which is what I suspected. Your information confirmed it; thanks.

Regarding the firewall… did you reinforce yours by adding a second thickness of real plywood, as detailed way back in this thread? I have no doubt that some additional fuel proofing will be needed, and perhaps some tri-stock here and there. But slapping on another firewall over the existing one is pretty… severe. Necessary, you think? Or not?

Off to check out the Saito 1.00...
.
The 10 lbs was just a number off the top of my head, my point was that you would be making a good air frame heavier. That 1/2 lb would have to be counter balanced some how.
As for my firewall, I replaced it after about my 3rd or 4th flight when I tested the stall speed at 3 ft off the ground. It popped out clean with very minor damage to the fuselage. I replaced it with 1/4 aircraft ply at that time. BTW, I believe the Saito 1.00 is lighter than the OS 91 and has slightly more hp. My 7.5 lb Ultra Sport with a Saito 1.00 w/13.5X9 prop has enough power to hover, though not enough tail to hold it for long.
Old 09-17-2015, 02:58 AM
  #859  
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GOOD HEAVENS !!!!! It's been nine and a half years and this thread is still going !!!!!! I've been away a long time and never checked in on RCU. [ but that doesn't mean I haven't been flying ] I still have my first Skybolt along with a kit-built one and they are the smoothest flying planes ever. Matter of fact, I call them the " Cadilacs ". Both with OS 91, Three-blade MA's. I've never broken a prop on them in all this time plus not one scuff on the wheel pants on either of them...... Not one ! The kit is one pound heavier than the ARF but no difference in performance at 4500 feet elevation. I was really looking to find out why JR stopped making their 1500 mh NI-MH TX batteries when I stumbled across this thread but sofar, no luck. Seeya guys around, MM
Old 09-17-2015, 12:53 PM
  #860  
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Just remember guy's, 3% power loss per 1000 ASL**....sooo....4500 ft. altitude equals a 13.5% Power Loss, very simple. Typical Saito 1.25 minus 13.5% equals a Saito 1.08...just sayin'...


**Normally Aspirated Internal Combustion Chamber Engines. Externally Aspirated Engines such as Turbocharged and or Supercharged engines, this rule does not apply.

Last edited by Prop_Washer2; 09-17-2015 at 03:38 PM.
Old 09-17-2015, 01:19 PM
  #861  
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I had my kit built bolt on a DLE 20 and a pumped 120 and both were a blast. The 20 cc was better in my opinion.
Old 09-17-2015, 02:18 PM
  #862  
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Originally Posted by stevegauth30 View Post
I had my kit built bolt on a DLE 20 and a pumped 120 and both were a blast. The 20 cc was better in my opinion.
Since they are BOTH 20cc, I assume you prefer the DLE 20cc over the OS Pumped 20cc....Just Sayin'....
Old 09-19-2015, 01:16 AM
  #863  
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For some reason, the DLE just pulled it WAY harder. Maybe the OS is getting old. LOL.
Old 09-19-2015, 03:40 AM
  #864  
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Looks like a Saito 1.00 is the optimum choice if I have to buy a new engine. My kit will be here first of next week; I'll verify that the Laser 1.50 is a no-go; if so, then I'll get a Saito enroute.

.
Old 10-11-2015, 03:49 PM
  #865  
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Has anyone tried stuffing a DLE 20 RA in the bolt yet I'm thinking about it just not sure if it will work any thoughts
Old 10-11-2015, 03:59 PM
  #866  
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been there, done that. All i can say is you wont be dissapointed. You will, however, have to cut your cowl to pieces.
Old 10-11-2015, 04:33 PM
  #867  
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have you any photos of the one you did
Old 10-12-2015, 01:06 AM
  #868  
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Here you go. Man, that was a fun little bipe.
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Old 10-14-2015, 04:54 AM
  #869  
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Thanks for your photos stevegauth30 it looks like yours was a kit build I'm looking to put a DLE 20 RA in the ARF and was wondering if anyone has done it or if it will even work
Old 10-14-2015, 07:45 AM
  #870  
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Originally Posted by wannabapilot View Post
Thanks for your photos stevegauth30 it looks like yours was a kit build I'm looking to put a DLE 20 RA in the ARF and was wondering if anyone has done it or if it will even work
I installed a side exhaust DLE 20 in mine and it was no problem. I have not finished it yet, but will this winter.
Gordon
Old 10-14-2015, 01:01 PM
  #871  
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is there that much of a difference in the motor box and cowl of the ARF? I would think you should be fine
Old 10-14-2015, 04:43 PM
  #872  
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I'm not sure on the later ARF but reading through the forum it seems that the early ARF may have had a weak firewall and I'm not sure if they addressed that issue in the later runs
Old 10-15-2015, 06:05 AM
  #873  
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Originally Posted by wannabapilot View Post
... it seems that the early ARF may have had a weak firewall and I'm not sure if they addressed that issue in the later runs
They didn't. I just opened my recently-purchased kit and had a look; two 3mm pieces of light ply laminated together. It "interlocks" into the fuselage sides, and has a couple of small pieces of tri-stock, but you can pretty much forget about beefing it up further from the back side; too much of a stretch and too much structure in the way.

The box says a .70 four stroke is acceptable. I find that a bit… optimistic, at the very least. No joy on the 1.20 Surpass I was promised, so I'm back to deciding what engine to get. I want plenty of power, but I don't want to bust that flimsy firewall loose with too much power.

This is annoying...

.
Old 10-15-2015, 11:23 AM
  #874  
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LSP 972- The most recent GP Skybolt ARF is pretty much the same as the earlier ones, with their selection of wood that thay use. I bought mine used/ wrecked at a swap meet, and only the firewall, and front formers were damaged. The previous owner that I bought it from has an OS 91 4 Stroke in it, and on his 2nd flight, he ground looped it, and the OS 91 went straight back and took out the firewall and F1-F4.
I did a refurbish of it, and have an article in the "Crash/Rebuild" forums here on RCU. If u go to that forum- go to page 4, and look at my article "GP Skybolt crash find" near the bottom of P4, and u will see how I rebuilt the front end, and added a lot more structural integrity to the front airframe. When u go to fly urs, make sure u let ur groundspeed get hi enough, and it will lift off effortlessly. You also may want to cut, and add an additional 1/8" ply firewall to the existing one for added support. I'm flying mine with an OS 61SF long stroke, and it will do anything I want it to. Here are a couple pics, but u can check out my article if u like. Let us know how u will progress with ur assembly, and maiden flight- Best of Luck-- Dean
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Old 10-19-2015, 08:20 AM
  #875  
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Many thanks for that, Dean. It looks to be the simplest solution to the problem.

I let a 1.08 FSR get away from me a few years back… sure wish I still had it for this airplane.

It will be a while before I get around to starting this one, so I've got time to select an engine. I'm just real hesitant to buy used these days...

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