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Need some info on my GP Super Sportster 90

Old 07-03-2005, 08:43 AM
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ckangaroo70
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Default Need some info on my GP Super Sportster 90

I have 4 flights on this Plane so far, and it is powered by a Super Tigre G90 with 13x6 MA K Prop. The first 2 Flights I had it powered by a Saito 100 4 stroke with 15X6 APC. The Saito has a ton of power, but it did seem a little doggy on this particular Plane. The Super Tigre G90 seems like a little better match, and seems to pull the Plane around at a pretty good clip now. Information about this Plane seems pretty scarce here on RCU, and I was just wanting to hear from those who have had this Plane, and might have some good information to share about it. One thing that I have noticed that I would like to fix is the Wing Mounted Gear seems a little flimsy. I could change the style of gear and move it forward, but I like the looks of it where it is. Moving it forward would also help eliminate alot of added weight in the nose, but like I said, I kind of like the gear where it is at. Any tips or suggestions would be appreciated. Thanks.
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Old 07-03-2005, 07:39 PM
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Default RE: Need some info on my GP Super Sportster 90

Surely mine is not the only one left in existence...................? If it is, you can find it on ebay soon for $10,000. LOL
Old 07-03-2005, 10:03 PM
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carrellh
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Default RE: Need some info on my GP Super Sportster 90

I never knew there was a 90 size. My brother is currently finishing a 60 size, fabric covered. I've only seen pictures since he started painting but it looks pretty good.
Old 07-04-2005, 03:22 AM
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Default RE: Need some info on my GP Super Sportster 90

And I could only afford the 40 size! I just had a dead stick on the first flight. Decided to put it down hard near the end of the runway as I was going to go into the weeds at the end.
If I didn't have wheel pants there woudl have been no damage. Instead there are now two holes in the underside of the wing from the somewhat pointy rear of the wheel pants. Made quite a loud noise to as it "popped" the monokote.
Easy fix but no more wheel pants om grass for me.
Old 07-05-2005, 09:18 AM
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Default RE: Need some info on my GP Super Sportster 90

Hi Ray,

Your SS90/120 looks great. I have had a SS120 for about 8 years. I installed a YS120 in mine. Its been one of my favorite planes to fly. I have never had any trouble with the landing gear. Flimsy gear is better than breaking wood unless it effects landing or takeoffs. Enjoy,

Jerry
Old 07-05-2005, 01:36 PM
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Default RE: Need some info on my GP Super Sportster 90

The 90 is the only size I DONT own. However, the 20 size is the only one I have that is built. All the other versions are still in kit form.
My SS20 is powered by an OS .25FP with a Macs 1 piece pipe. Flies with authority but I wish I had used a BB engine instead. I have an Irvine .25MKII but the engine is red and would have clashed with the Steelers color scheme I used.
I also have a GMS .32 but retrofitting it would involve rebuilding the nose quite a bit and I dont wanna do that.
Wish I could help ya with the 90.
Old 07-05-2005, 02:15 PM
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mcarleno
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Default RE: Need some info on my GP Super Sportster 90

I have a 60 size with a Tower .75 turning a 12x6 at 16,000rpms and she screams. This plane, though she fly's well slow, needs speed! That's all there is to it. But reading your original post, I don't think that its the engine selection. I think it's the prop.

Here goes:

GS90 w/13x6 = 6" * 15,000rpm * 60minutes / 12 / 5280' = 85.23mph
Saito 100 w/15x6 = 6" * 10,000rpm * 60minutes / 12" / 5280' = 56.82mph (she will probably fly straight up though).

I would go with a 13x10 on the Saito 100 so:
Saito 100 w/13x10 = 10" * 10,000rpm * 60minutes / 12" / 5280' = 94.70mph

These calculation of course are theoritical and do not account for drag, but my 60 SS has been clocked on level flight nearly 90 mph and she is very happy at that speed.

So if you want to stick with the 4 stroke, change your prop for speed rather than power.

Old 07-05-2005, 09:46 PM
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Default RE: Need some info on my GP Super Sportster 90


ORIGINAL: carrellh

I never knew there was a 90 size. My brother is currently finishing a 60 size, fabric covered. I've only seen pictures since he started painting but it looks pretty good.
The 90/120 size Super Sportster is a Great Planes Kit that was discontinued somewhere in late 80's-early 90's I believe. I really don't know alot of info on the Plane which is the heart of my post here. It is a ball to fly though!
Old 07-05-2005, 09:59 PM
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Default RE: Need some info on my GP Super Sportster 90


ORIGINAL: 4*60

And I could only afford the 40 size! I just had a dead stick on the first flight. Decided to put it down hard near the end of the runway as I was going to go into the weeds at the end.
If I didn't have wheel pants there woudl have been no damage. Instead there are now two holes in the underside of the wing from the somewhat pointy rear of the wheel pants. Made quite a loud noise to as it "popped" the monokote.
Easy fix but no more wheel pants om grass for me.
I had the Super Sportster 40 size also, but mine was the new ARF version. I sold it last year after many flights. The Plane was a great flyer, and actually the 90/120 fly's just as good, and is pretty zippy with the ST G90......JUST BIGGER! I never had any trouble with the pants comming up into the wing on the 40 size, but I did have to beef up the gear on the 90/120 size because I did have a pant come up into the wing on it. I added springs to the front side of gear to help hold them forward some.
Old 07-05-2005, 10:01 PM
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Default RE: Need some info on my GP Super Sportster 90


ORIGINAL: jlchapman

Hi Ray,

Your SS90/120 looks great. I have had a SS120 for about 8 years. I installed a YS120 in mine. Its been one of my favorite planes to fly. I have never had any trouble with the landing gear. Flimsy gear is better than breaking wood unless it effects landing or takeoffs. Enjoy,

Jerry
Thanks for the compliments. I bet that YS really makes her sing!
Old 07-05-2005, 10:14 PM
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Default RE: Need some info on my GP Super Sportster 90


ORIGINAL: mcarleno

I have a 60 size with a Tower .75 turning a 12x6 at 16,000rpms and she screams. This plane, though she fly's well slow, needs speed! That's all there is to it. But reading your original post, I don't think that its the engine selection. I think it's the prop.

Here goes:

GS90 w/13x6 = 6" * 15,000rpm * 60minutes / 12 / 5280' = 85.23mph
Saito 100 w/15x6 = 6" * 10,000rpm * 60minutes / 12" / 5280' = 56.82mph (she will probably fly straight up though).

I would go with a 13x10 on the Saito 100 so:
Saito 100 w/13x10 = 10" * 10,000rpm * 60minutes / 12" / 5280' = 94.70mph

These calculation of course are theoritical and do not account for drag, but my 60 SS has been clocked on level flight nearly 90 mph and she is very happy at that speed.

So if you want to stick with the 4 stroke, change your prop for speed rather than power.

Thanks for the great info. The best I could get out of the Saito 100 with the 15x6 APC is about 9400RPM running happy. It is now mounted on my 1/4 scale spacewalker, and seems very at home there using the 15x6 also. I havn't used the tach on the G90 since I am still getting it broke in, but its been running very happy also up to this point and carry's the Plane around at a pretty good clip with the MA Kseries 13x6. I will get some tach readings on it next time I run it, and may experiment with some different props. I have been landing it fairly hot up to this point, and will do some experimenting once I get my landings fine tuned a little better.
Old 07-05-2005, 10:20 PM
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Default RE: Need some info on my GP Super Sportster 90


ORIGINAL: Fubar-One

The 90 is the only size I DONT own. However, the 20 size is the only one I have that is built. All the other versions are still in kit form.
My SS20 is powered by an OS .25FP with a Macs 1 piece pipe. Flies with authority but I wish I had used a BB engine instead. I have an Irvine .25MKII but the engine is red and would have clashed with the Steelers color scheme I used.
I also have a GMS .32 but retrofitting it would involve rebuilding the nose quite a bit and I dont wanna do that.
Wish I could help ya with the 90.
I wouldn't mind having every size myself oneday, but with 12 other Planes my hangar, it is a bit full at this point. I havn't done enough crashing this year.......... yet!LOL I even like the looks of the little SS electric one, and I bet it flys good as well.
Old 07-07-2005, 07:46 PM
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Default RE: Need some info on my GP Super Sportster 90

Oh, if I had em all built I couldnt get into the garage! As I said, only the 20 is built. The other SS20 is still in the box along with both SS 40's, the SS40 MKII, SS60, AND the SS Bipe.
Think I forgot to mention the RCM Sportster...
Oh, and the partially built SS20 that some guy at the field just handed me one day. It paid to be the only one with kit built planes at the field that morning. [8D]
Guess Im a Super Sportster Hoarder.

Wont go into my list of Kaos/Chaos kits waiting to be built. Actually building one of those right now tho...

My name is Dan and I'm a Kit-aholic...
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Old 04-21-2006, 01:57 PM
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Capt. Bill
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Default RE: Need some info on my GP Super Sportster 90

Nah, one just went on ebay for $290
Old 04-21-2006, 06:29 PM
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Default RE: Need some info on my GP Super Sportster 90

I just bought another Super Sportster 90/120 kit on ebay a week or so ago, and got it for $150. There was also a little Super Sportster Bipe kit on there at the same time I would have liked to have owned. I didn't get back in time to bid on that one, and am not sure how much it went for. Sometimes it is just hard to tell. The SS 90/120 kit I just got was complete and the wood and hardware all look great. So if you seen one go for $290, that makes me that much happier about the price I gave for mine.
Old 04-21-2006, 06:37 PM
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Capt. Bill
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Default RE: Need some info on my GP Super Sportster 90

I remember seeing that on Ebay. Thought about it but I still have SS 9/120 that is built but not covered yet. I also saw the SS Bipe but had already got a Great Plane Aeromaster Bipe. Only $126 for that one. You just have to catch the auctions at the right time when two people are not driving up the price. And you have the best chance if snipe at the last minute.
Old 04-23-2006, 12:04 AM
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chashint
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Default RE: Need some info on my GP Super Sportster 90

Here is a link to pictures that will show you what a Super Sportster looks like with the gear moved forward of the wing.

http://www.rcuniverse.com/gallery/ga...memberId=24522
Old 08-13-2006, 08:45 AM
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Default RE: Need some info on my GP Super Sportster 90

Its been a few months since I posted to my thread here, but I have since built the second Super Sportster kit I bought, and talked about in an above post. The new Super Sporster 90/120 will be going up for a maiden flight toay. This Plane was built pretty much stock except that I did buy landing gear(funtana 90) to mount just in front of the wing. I also sealed the elevator hinge line, installed guide wires, and added tristock reinforcement under the stab. The Plane has a SK 90 2 stroke engine mounted on the nose swinging a 14x6 prop, and a 16 oz tank was installed for a little extra run time. The Plane is also only equipped with 4 servos instead of the 6 standard that I used in my other Super Sportster 90/120. I used Hi-tec 605 High Torque servos on the Elevator, Rudder, Ailerons, and a standard Futaba 3004 on throttle. I saved a bit of weight this way, and the servos seem to have plenty of pull since the surfaces really are not that big on a sportster anyhow, and especially compared to that of some 3d style planes. I was able to balance the Plane just by shoving the battery clear forward in the tank compartment. Only 1/2 oz lead required in left wing tip for good lateral balance. Should be a good flyer.

Edit: After Maiden Flight, the Plane required another 1/2 oz of lead on the light wing tip, and about 3 oz has been added to the nose to help make the Plane less pitch sensitive.
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Old 08-13-2006, 03:31 PM
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Default RE: Need some info on my GP Super Sportster 90

I have enjoyed the postings here on the Super Sportster's .... I have a new kit built SS 60 and I need a canopy or windshield.... Can you tell me where you purchased your canopy or windshield ( if not in the kit) and what you recommend... The top of my SS 60 fuse is flat and is an older kit... Thanks..
Old 08-13-2006, 05:55 PM
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Default RE: Need some info on my GP Super Sportster 90

You can still order the canopy's for the Super Sportster kits. Here is the one you need.
http://www2.towerhobbies.com/cgi-bin...?&I=LXJ939&P=7
Old 08-14-2006, 09:21 AM
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Default RE: Need some info on my GP Super Sportster 90

Got to maiden flight my Super Sportster 90/120. I was very impressed with the SK 90 engine which started the very first flip after me and my buddy fixed a fuel tank restriction. We ran two tanks through it, and it was ready to be put in the air. The Plane handled very well on the ground, but as soon as I took off I new that I had my C.G way to far back(tail heavy) as the Plane was very pitch sensitive and I struggled to maintain control while I brought it around to land in a slight cross wind. The engine was also a bit lean in the mid range and needed richened up a bit. I managed to get the Plane down, and somehow managed a nice smooth landing. Even though my nerves were shot at this point, I added some nose weight, dialed down the throws a little on the elevator, fueled up and took off again. This time the Plane flew much better, but was still a bit pitch sensitive on the elevator, and it was still just a bit heavy on one side, so I brought it in and added a bit more nose weight, and added a 1/2 oz to the light wingtip. Fueled up and took it off again. This time the Plane flew good, and if I could have settled my nerves some I might have tried a few manuevers, but just flew several simple ovals to get aquainted with the Plane a little. I will have to get some more flying in on this Plane to make a good asessment of how well I am going to like it. This is my second Super Sportster 90/120, and the third Super Sportster I have owned. My other two were great flyers and I expect that this one will be as well once I get it tweaked and tuned to my liking.
Old 08-14-2006, 11:36 AM
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Default RE: Need some info on my GP Super Sportster 90

Thanks for the info on the canopy from Tower for a Super Sportster 60.... That canopy will require trimming to fit the the flat top of the fuse..... I was hopeing for an exact or near exact fit... Thanks... Richard
Old 08-14-2006, 12:30 PM
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Default RE: Need some info on my GP Super Sportster 90


ORIGINAL: Richard39

Thanks for the info on the canopy from Tower for a Super Sportster 60.... That canopy will require trimming to fit the the flat top of the fuse..... I was hopeing for an exact or near exact fit... Thanks... Richard
The canopy has lines within the mold for you to follow when cutting. As long as no modifications have been made to the cockpit area of your sportster, all you will have to do is cut along those lines for a perfect fit. They are easy to cut with a good heavy duty pair of scissors.The Sportsters I have built came with the canopies in the kit and those you have to cut as well, and are the exact same that Tower sells for replacement canopies.
Old 08-14-2006, 05:17 PM
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Default RE: Need some info on my GP Super Sportster 90

Your reply was excellent and has given me a better picture of buying and installing the canopy sold by Tower for the SS 60... Thanks..
Old 10-14-2006, 07:43 PM
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Default RE: Need some info on my GP Super Sportster 90

Ray- you talk about having to add nose weight to get your SS 120 to fly correctly. Once you had it set up properly, where is the balance point?

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