Great Planes Shoestring
05-18-2004 | 05:48 PM
#126
RE: Great Planes Shoestring
In answer to the earlier request, here are the photos of the cowl mounting. Once again, dowel in the front going into a hole in the front former, and a screw through the top in the back going into a block on the wing saddle former.
05-18-2004 | 06:43 PM
#127
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From: Hawthorne, CA
RE: Great Planes Shoestring
Rick,
It's not the angle that's the problem, it's the position of the thrust washer so when you adjust the cowl to center on it the cowl may be pointing up or down which makes it not square to the backplate. By turning over the mount and placing the engine on top of it (inverted of course) it places the thrust washer in the center so the cowl is in the proper position.
I wish I had it here to take a picture because I don't think I'm explaining it well enough.
It's not the angle that's the problem, it's the position of the thrust washer so when you adjust the cowl to center on it the cowl may be pointing up or down which makes it not square to the backplate. By turning over the mount and placing the engine on top of it (inverted of course) it places the thrust washer in the center so the cowl is in the proper position.
I wish I had it here to take a picture because I don't think I'm explaining it well enough.
05-18-2004 | 11:40 PM
#131
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From: Hawthorne, CA
RE: Great Planes Shoestring
Rick,
As a matter of fact I stuffed a 20 or 24 (can't remember) under the wing after a little carving. I kept it back around the CG and went bigger because the stock 10 or 12 will only give you about 8 minutes max on that engine.
As a matter of fact I stuffed a 20 or 24 (can't remember) under the wing after a little carving. I kept it back around the CG and went bigger because the stock 10 or 12 will only give you about 8 minutes max on that engine.
05-19-2004 | 05:30 PM
#135
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From: Fort Mill,
SC
RE: Great Planes Shoestring
Okay, I got the incidense meter on the Shoestring today. My wing is at +1.5 and the engine was at -.5 degrees after I removed the washers from behind the motor mount. After I moved the engine to -2.5 degrees on the down thrust the front of the cowl and the back of the spinner were pretty much parallel to each other. After seeing how much it needs to be twisted in the mount to get to -2.5 degrees I sure don't believe there is any down thrust built into the firewall at all. I am hoping to get her out for a test flight Friday or Saturday and will let you all know what happens.
Jeff
Jeff
05-19-2004 | 09:33 PM
#136
RE: Great Planes Shoestring
Jeff, based on our two observations, :
http://www.rcuniverse.com/forum/GP_S...1829908/tm.htm
http://www.rcuniverse.com/forum/GP_S...1829908/tm.htm
05-20-2004 | 11:57 AM
#138
RE: Great Planes Shoestring
NOTICE - I goofed in my previous post. The GP web site technical data calls for 2.5 degress RIGHT, and 2 degrees DOWN, not vice-versa, as I wrote before. Sorry about that.
05-20-2004 | 06:24 PM
#139
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From: Copper Cliff,
ON, CANADA
RE: Great Planes Shoestring
Rick, My Handle "2003Z06" is my car! I don't know what the math is to figure out the rpm you stated is required to make the speed I'm claiming, all I know is what the radar gun says! Also I failed to mention that I use 15% Omega for fuel so that helps me with a little more rpm than the average 5-10% blends the majority of our club uses. Anyway I still can't believe you didn't know what the greatest North American built sports car is
That's an arguement for a whole other chat site!!!LOL Here is an attathment of my car I found on the web....when I get my digi cam back I will post pics of mine
That's an arguement for a whole other chat site!!!LOL Here is an attathment of my car I found on the web....when I get my digi cam back I will post pics of mine
ORIGINAL: RickVB
Just a general thread update...
2003Z06 (what kinda handle is that, anyhow?) - I think that's the first speed estimate I believe here. Note that if you do the math, 113mph straight and level requires just over 14,900rpm, which is well within the reasonable range for the OS 61fx in the air. I think 2000rpm worth of unloading at that range is realistic, isn't it?
Basin, belated thanks for the naptha tip for removing the old decal glue. It did indeed work like a charm.
Over the weekend, I tightened up all the covering, finished replacing all the wrinkly decals, replaced the suspect aileron servos, hooked up all the linkages and programmed the radio, balanced with a new 6-cell battery against the rear former and 3oz of lead in the tail (how the heck was the former owner landing this thing, anyway?? I had already moved the engine back 5/8", as it was balancing near the L.E.) , and then took her out back to do engine testing. Recall I have a TT91 4c, mounted inverted. First off, it has a TT nylon 15x8 prop that came with it. Seemed like too much prop to me, and indeed I can only get 7900rpm with Omega 10%. Will pick up a 14x8 and a 13x10 today, and see what happens.
The other problem is the idle. Oddly, it idles down OK to about 1950rpm, and it will run steadily there for about 30 seconds. Then it suddenly begins to sputter, and if I don't throttle up within 5 seconds or so it conks out. With the battery on, it will idle steadily at 1800, but it just dawned on me that I don't think I let it idle more than 30 seconds with the battery on, so I don't know for sure if it dies then or not. Might the plug or a fuel system problem. Will check again tonight. Any thoughts?
Anyhow, if the dang afternoon thunderstorms ever quit (forecast for every day through Saturday, aagh! [sm=angry.gif] ), I'll hopefully get it up sometime this week.
Just a general thread update...
2003Z06 (what kinda handle is that, anyhow?) - I think that's the first speed estimate I believe here. Note that if you do the math, 113mph straight and level requires just over 14,900rpm, which is well within the reasonable range for the OS 61fx in the air. I think 2000rpm worth of unloading at that range is realistic, isn't it?
Basin, belated thanks for the naptha tip for removing the old decal glue. It did indeed work like a charm.
Over the weekend, I tightened up all the covering, finished replacing all the wrinkly decals, replaced the suspect aileron servos, hooked up all the linkages and programmed the radio, balanced with a new 6-cell battery against the rear former and 3oz of lead in the tail (how the heck was the former owner landing this thing, anyway?? I had already moved the engine back 5/8", as it was balancing near the L.E.) , and then took her out back to do engine testing. Recall I have a TT91 4c, mounted inverted. First off, it has a TT nylon 15x8 prop that came with it. Seemed like too much prop to me, and indeed I can only get 7900rpm with Omega 10%. Will pick up a 14x8 and a 13x10 today, and see what happens.
The other problem is the idle. Oddly, it idles down OK to about 1950rpm, and it will run steadily there for about 30 seconds. Then it suddenly begins to sputter, and if I don't throttle up within 5 seconds or so it conks out. With the battery on, it will idle steadily at 1800, but it just dawned on me that I don't think I let it idle more than 30 seconds with the battery on, so I don't know for sure if it dies then or not. Might the plug or a fuel system problem. Will check again tonight. Any thoughts?
Anyhow, if the dang afternoon thunderstorms ever quit (forecast for every day through Saturday, aagh! [sm=angry.gif] ), I'll hopefully get it up sometime this week.
05-20-2004 | 07:00 PM
#140
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From: Rochester,
NY
RE: Great Planes Shoestring
Sad day A little over a week ago... I'm in NY and been waiting for spring. Been flying in tall grass and high winds. Grass was real tall at the field and had 3 great flights but was having trouble with my Shoestring nosing over on taxi so I was being lazy after walking out to get it a couple times and took off from where I was standing. It was a hard cross wind and probably a little down wind.. STUPID I KNOW... Here is the results... SUCKS... Will get another one... Love the plane too much not to have one.Attached a video of my WACO biplane that I fly... Flight was from last weekend... A bud on mine took the video and edited it. Barbie aviation Pilot... The video has nothing to do with the Shoestring but just for those who want to see something diff.
[link]http://wings-of-valor.net/uploads/BarbieBipe_250.wmv[/link]
05-21-2004 | 01:18 PM
#141
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From: Fort Mill,
SC
RE: Great Planes Shoestring
I got the Shoestring out for a flight today. It flys straight and level but still has about 1/16" or maybe a touch more of down on the elevator. That's an improvement over before. The plane did not balloon when power was cut though I'm not sure I would expect that since I'm only trying to set the down thrust to what the manufacturer says it should be. Unfortunately I was only able to get one flight in due to a problem with the Perry pump but I will hopefully know more after the weekend.
With the new 20 oz fuel tank I had a 10 minute flight and still had well over 1/3 of a tank left. Purrrrrrfect!!!
Jeff
With the new 20 oz fuel tank I had a 10 minute flight and still had well over 1/3 of a tank left. Purrrrrrfect!!!
Jeff
05-21-2004 | 03:12 PM
#143
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From: Hawthorne, CA
RE: Great Planes Shoestring
Jeff,
Good to know, I guess I'll have to go back and check the trim adjustments on the one I built. Some washers would easily solve and thrust issues.
Good to know, I guess I'll have to go back and check the trim adjustments on the one I built. Some washers would easily solve and thrust issues.
05-23-2004 | 05:50 AM
#144
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From: Fort Mill,
SC
RE: Great Planes Shoestring
I got three more trouble free 10 minute flights on the Shoestring yesterday. Adding the down thrust did not completely solve my issues with the plane but I think I can live with that way it is now. One of my favorite maneuvers with all of my planes is the high speed worm burner run down the runway with the ocasional unintentional touch and go. On my other planes they will drop and you keep it from plowing in by giving it little burps of up elevator. This plane just doesn't seem to want to drop and I find it uncomfortable feeding in down elevator when I'm that close to the deck. I did see from the specs that Rick gave that my wing has +.5 degrees too much wing incidense but given the difficulty of changing that on this plane I think I can live with it the way it is.
I also want to retract my earlier comment about my plane not nosing over. I realized yesterday that the reason it doesn't nose over is that I'm constantly using up elevator during roll out and as soon as the wheels touch the ground to keep the tail planted. As an experiment I tried to take off without adding the up elevator and as soon as the tail lifted it rose well past horizontal and eventually nosed completely over. I guess you just get used to handling a plane the way you need to and eventually forget you're doing anything unusual to make her fly.
Jeff
I also want to retract my earlier comment about my plane not nosing over. I realized yesterday that the reason it doesn't nose over is that I'm constantly using up elevator during roll out and as soon as the wheels touch the ground to keep the tail planted. As an experiment I tried to take off without adding the up elevator and as soon as the tail lifted it rose well past horizontal and eventually nosed completely over. I guess you just get used to handling a plane the way you need to and eventually forget you're doing anything unusual to make her fly.
Jeff
05-23-2004 | 11:28 AM
#145
RE: Great Planes Shoestring
Jeff, in general with tail draggers that's the way you have to handle them on the ground (as far as I know). The trick is learning when on an individual plane to let up on the elevator so it doesn't pop up and stall as it gains speed. Didn't have that problem with my plane the one actual takeoff I did.
My ground handling problem is that the thing wants to nose over when it hits the least bit of resistance (bump, hole, grass) while rolling *without* power. If I keep the power on (1/4 throttle or more) then there's no problem. But that makes for some rather high speed taxiing. I believe a little experience will allow me to learn when to blip the throttle (and how much) to keep the nose up.
My ground handling problem is that the thing wants to nose over when it hits the least bit of resistance (bump, hole, grass) while rolling *without* power. If I keep the power on (1/4 throttle or more) then there's no problem. But that makes for some rather high speed taxiing. I believe a little experience will allow me to learn when to blip the throttle (and how much) to keep the nose up.
05-23-2004 | 01:13 PM
#146
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From: Rochester,
NY
RE: Great Planes Shoestring
I had the same problem with mine. At the start of the taxi or at very slow speed or restriction on the ground (bumps , high grass, or depressions) it would nose over... If you got it rolling at a faster speed I could control it and the problem would end.
Jeff, I see you have a wood prop. For speed why not an APC prop? I started out with a wood prop and switched to APC and gain lots of speed.
Jeff, I see you have a wood prop. For speed why not an APC prop? I started out with a wood prop and switched to APC and gain lots of speed.
05-23-2004 | 06:18 PM
#147
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From: Fort Mill,
SC
RE: Great Planes Shoestring
Actually that's an old picture. I am now running a 13x8 apc if I remember right.
Three more flawless 10 minute flights today. I don't think I have ever burned 3/4 of a gallon of fuel in one weekend before. We had 10 mph winds today but that plane cuts through 'em like a hot knife through butter!!!
Jeff
Three more flawless 10 minute flights today. I don't think I have ever burned 3/4 of a gallon of fuel in one weekend before. We had 10 mph winds today but that plane cuts through 'em like a hot knife through butter!!!
Jeff
05-28-2004 | 03:33 PM
#148
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From: Fayette,
AL
RE: Great Planes Shoestring
Well, I finally got it in decent shape again. It's a "Frankenplane", but it will fly and that's all I can do for it. Below are a couple of pics of the butchering, errr I mean repair job I did. Keep in mind this is a major improvement in my building/repair skills. Also, this is the second repair on this plane. I just love to ressurect it again and again. 
It will fly this weekend if the weather holds. Only covering remains and that's an easy task.
P.S. Not a word about my messy table
It will fly this weekend if the weather holds. Only covering remains and that's an easy task.P.S. Not a word about my messy table
05-28-2004 | 03:58 PM
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From: Lusby,
MD
RE: Great Planes Shoestring
RickVB:
You had a question about the YS backside clearance; I replaced a TT .91 with a YS .91 on my GP Extra 300 .60 size and the issue I had was the YS had the throttle on the opposite side! I played hell getting the throttle linkage connected...
You had a question about the YS backside clearance; I replaced a TT .91 with a YS .91 on my GP Extra 300 .60 size and the issue I had was the YS had the throttle on the opposite side! I played hell getting the throttle linkage connected...
05-28-2004 | 05:50 PM
#150
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From: Rochester,
NY
RE: Great Planes Shoestring
ORIGINAL: Primodus
Well, I finally got it in decent shape again. It's a "Frankenplane", but it will fly and that's all I can do for it. Below are a couple of pics of the butchering, errr I mean repair job I did. Keep in mind this is a major improvement in my building/repair skills. Also, this is the second repair on this plane. I just love to ressurect it again and again. It will fly this weekend if the weather holds. Only covering remains and that's an easy task.
P.S. Not a word about my messy table
Well, I finally got it in decent shape again. It's a "Frankenplane", but it will fly and that's all I can do for it. Below are a couple of pics of the butchering, errr I mean repair job I did. Keep in mind this is a major improvement in my building/repair skills. Also, this is the second repair on this plane. I just love to ressurect it again and again.
It will fly this weekend if the weather holds. Only covering remains and that's an easy task.P.S. Not a word about my messy table
