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Airborne Intruder 90 - 3/21/2006 1:54:21 PM   
Ed Cregger


 

Posts: 7983
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline 		I'm jumping back into SPA flying and just ordered a new Airborne Intruder 90 ARF. Is anyone flying one of these? What are you powering it with? What are its weak points? How does it fly in knife-edge? Is there much rudder roll coupling?

I'm on the fence regarding engine choice. I have a new Rossi .60, a new K&B .61, a used HB .61 (not PDP) and a Saito .82 to choose from. I could probably get my hands on a Saito .91, if need be.

I have a Dirty Birdy 60 on the bench, but that will take quite a while to finish. I want to fly now. That's why I ordered the ARF.

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RE: Airborne Intruder 90 - 3/21/2006 2:51:22 PM   
8178



Posts: 3092
Joined: 5/25/2004
From: _ , USA
Status: offline 		99.99% of the SPA flyers use the O.S. FS-91 II Surpass


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RE: Airborne Intruder 90 - 3/21/2006 2:51:58 PM   
Sport_Pilot



Posts: 7822
Joined: 1/21/2002
From: Acworth, GA, USA
Status: online 		Building a Kaos myself Ed. That is a popular plane in the SPA circuit, really the only legal ARF that is competitive. The Global Quick Fli is to heavy. My understanding is that it works well with the OS 91 FS but tends to be nose heavy with it. I would think a Saito .91 would work better, but I hardly see Saito's at the competition. Guess just not cool with that crowd. Of course it also fly's well with any .61 two stroke, but since pipes are not allowed, the four strokes have a slight advantage. Just the same I will put .61 HP on my Kaos, more than enough power for the novice, though I don't know if I will actually compete, een though one of the contests is just five miles from my house. Maybe when the kids are in college.

< Message edited by Sport_Pilot -- 3/21/2006 2:55:36 PM >

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RE: Airborne Intruder 90 - 3/22/2006 12:04:18 AM   
Ed Cregger


 

Posts: 7983
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline 		I have a couple of NIB Kaos ARFs too. I just had a bit of nostalgia when remembering reading Jim Kirklands articles in MAN. He was my hero, of sorts.

If the folks at SPA weren't going to allow tuned pipes on the two-strokes, they should have limited the four-strokes to .82 or so displacement sized engines. The .91 size gives the four-strokes too much of an edge. Then again, I'll probably never fly in competition anyway.

I have a NIB Magnum .91 four-stroke that I can use, if need be.

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RE: Airborne Intruder 90 - 3/22/2006 12:19:07 AM   
8178



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quote:

ORIGINAL: Ed Cregger

I have a couple of NIB Kaos ARFs too. I just had a bit of nostalgia when remembering reading Jim Kirklands articles in MAN. He was my hero, of sorts.

If the folks at SPA weren't going to allow tuned pipes on the two-strokes, they should have limited the four-strokes to .82 or so displacement sized engines. The .91 size gives the four-strokes too much of an edge. Then again, I'll probably never fly in competition anyway.

I have a NIB Magnum .91 four-stroke that I can use, if need be.


I’m with you! The 91 FS are too big and way too expensive! Mickey’s original idea was to keep it simple and low cost that’s why no pipes or retracts. For the price of an OS 91 you could buy a very nice 61 with pipe and have change left over!



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RE: Airborne Intruder 90 - 3/22/2006 2:33:46 AM   
spbyrum


 

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Status: offline 		Ed

The Saito should work well. Intruders do tend to be nose heavy with a 4 stoke mounted. The OS 91 usually takes 4 oz or so of lead in the tail. A lot of guys have put most of that under the vertical fin before gluing it on. The Saito is lighter than the OS, so it should not take so much.

I have not flown an Intruder for 5 or 6 years, so I don't remember where the cg was. You might ask here, and on the SPA mail list.

Intruder canopies are notoriously weak. If you screw it on, it will break out the holes. If you mount everything as if you were going to use screws then slide some waxed paper between the cowl and the front portion of the canopy, you can use a small paint brush to wick canopy glue under the edge where the canopy contacts the fuselage. It'll stay on, will not break because there are no holes, and you'll still be able to slip the cowl out from under the canopy if necessary.

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RE: Airborne Intruder 90 - 3/22/2006 7:40:58 AM   
Ed Cregger


 

Posts: 7983
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline 		Thanks to all for your comments.

Are Ultrathrust (hope I got the name right) SPA legal?

Roger the canopy advice. I usually glue my canopies on with an old bottle of RC-56. Hope I can still find it. <G>

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RE: Airborne Intruder 90 - 3/22/2006 7:53:16 AM   
Ed Cregger


 

Posts: 7983
Joined: 1/31/2002
From: Ringgold, GA, USA
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quote:

ORIGINAL: spbyrum

Ed

The Saito should work well. Intruders do tend to be nose heavy with a 4 stoke mounted. The OS 91 usually takes 4 oz or so of lead in the tail. A lot of guys have put most of that under the vertical fin before gluing it on. The Saito is lighter than the OS, so it should not take so much.

I have not flown an Intruder for 5 or 6 years, so I don't remember where the cg was. You might ask here, and on the SPA mail list.

Intruder canopies are notoriously weak. If you screw it on, it will break out the holes. If you mount everything as if you were going to use screws then slide some waxed paper between the cowl and the front portion of the canopy, you can use a small paint brush to wick canopy glue under the edge where the canopy contacts the fuselage. It'll stay on, will not break because there are no holes, and you'll still be able to slip the cowl out from under the canopy if necessary.



-------------------


The Saito .91 equipped classic pattern ship might actually turn out to be a tad tail heavy.

My ST G60 (typical .60 two-stroke of the era) weighs 20 ozs without muffler. My last Saito .91 weighed 19 ozs and some change with muffler, IIRC.

I like Saito and OS equally, so I have no prejudice from a brand perspective. Maybe I'll look into getting a Saito .91 again. I have a Saito .82 and I'm tempted to try that first.




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RE: Airborne Intruder 90 - 3/22/2006 8:17:44 PM   
spbyrum


 

Posts: 113
Joined: 11/22/2002
From: Cullman, AL, USA
Status: offline 		Yes. If it looks like a muffler then it's a muffler.

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RE: Airborne Intruder 90 - 3/22/2006 8:54:54 PM   
Sport_Pilot



Posts: 7822
Joined: 1/21/2002
From: Acworth, GA, USA
Status: online 		Sure? SPA has a ruld against pipes and it looks like a pipe to me. The SPA site has a forum board, as well as the latest rules. I had the wrong url link before. the correct link to the rules is, http://www.seniorpattern.com/rules.asp

< Message edited by Sport_Pilot -- 3/22/2006 9:06:53 PM >

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RE: Airborne Intruder 90 - 3/23/2006 2:48:16 AM   
Ed Cregger


 

Posts: 7983
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline 		Thanks, everyone.

I'm as changeable as the weather, so who knows what will power the Intruder 90?

I received a phone call from Airborne saying that the Intruder 90 had been discontinued, but that they had one damaged one left in the "Scratch and Dent" section at a reduced price. I told them to send it. They said it was mostly box damage. I've built from scratch before and I was considering recovering the model anyway. I don't like Navy planes.

I'll scour the rules (thanks Sport Pilot) and see if I can find anything definitive, although I think I've already received the correct answer from Steve Byron (sp?). If so, I'll go with the new Rossi .60, just to irritate everyone with the sound.

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