GP JU-87 Stuka engine question
#26
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From: waukesha,
WI
I just sold my Stuka, having never even flown it. I can tell you that the 91 four stroke would probably be better suited in the stuka though. The stuka will definately handle the extra weight, bigger prop, and greater torque - all of which the four stroke will supply.
Besides, the shoestring may not take the larger prop that would be needed on the four stroke. You might end up with prop clearance issues with the ground. Its actually a pretty small plane. A guy in my club has one and it really moves on a 61 2 stroke. If you mount the 91 2 stroke, it should be extremely fast.
Besides, the shoestring may not take the larger prop that would be needed on the four stroke. You might end up with prop clearance issues with the ground. Its actually a pretty small plane. A guy in my club has one and it really moves on a 61 2 stroke. If you mount the 91 2 stroke, it should be extremely fast.
#27
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From: Bad News, VA,
Did you sell it on eBay? I just bought one on eBay earlier this week from a guy in Wisconsin.
I plan on using a 4-stroke, yet to be determined, because this warbird really needs the sound and torque provided. It's not one to fly stunts with, it's best suited for scale flight, fly-by's, bombing dives, etc and the 4-stroke IMO is the way to go!
Please post if anyone finds a source for decals, a complete set of authentic markings would be nice (for example, GWS ME109 comes with 4 different authentic schemes) but really just finding the swastikas would be nice. I don't understand selling a "scale" model and leaving out "offensive" decals for PC reasons....war is hell. Easy fix. The GP Stuka doesn't come with a dive bomb siren either, but mine will have one soon!
Wes
I plan on using a 4-stroke, yet to be determined, because this warbird really needs the sound and torque provided. It's not one to fly stunts with, it's best suited for scale flight, fly-by's, bombing dives, etc and the 4-stroke IMO is the way to go!
Please post if anyone finds a source for decals, a complete set of authentic markings would be nice (for example, GWS ME109 comes with 4 different authentic schemes) but really just finding the swastikas would be nice. I don't understand selling a "scale" model and leaving out "offensive" decals for PC reasons....war is hell. Easy fix. The GP Stuka doesn't come with a dive bomb siren either, but mine will have one soon!
Wes
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From: Rochester,
NY
ORIGINAL: TripleFlipOut
Easy fix. The GP Stuka doesn't come with a dive bomb siren either, but mine will have one soon!
Wes
Easy fix. The GP Stuka doesn't come with a dive bomb siren either, but mine will have one soon!
Wes
#29
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From: Chicago, IL, VIRGIN ISLANDS (USA)
The 91 4 Stroke engine mounting is NOT that big a deal. The stock motor mount, and firewall holes will work fine. It doesnt mount 180 degress straight down (with the stock holes), its about a 45 degree off set. The head of my OS 91 Surpass pokes out the right side of the cowling, at about 135 degrees down.
Swastika: Get "GERMAN WWII DECAL SHEET NO. 500" from these people. I found mine at a small hobby store, but you can order it. Almost PERFECT sized:
MAJOR DECALS (MAJ)
21 FISHER AVENUE
PO BOX 304
EAST LONGMEADOW , MA 01028
PHONE: 413-525-4110
Here are some other #'s for the same company:
(800)557-5617
(413)525-5617
Fax: (413)525-7794
Swastika: Get "GERMAN WWII DECAL SHEET NO. 500" from these people. I found mine at a small hobby store, but you can order it. Almost PERFECT sized:
MAJOR DECALS (MAJ)
21 FISHER AVENUE
PO BOX 304
EAST LONGMEADOW , MA 01028
PHONE: 413-525-4110
Here are some other #'s for the same company:
(800)557-5617
(413)525-5617
Fax: (413)525-7794
#30
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From: waukesha,
WI
TripleFlipOut: Yes I did sell mine on ebay but I don't think it is the same one. I sold mine a month ago to a guy in Iowa. It already had a four stroke 91 mounted.
#31
I put the first flight on my Stuka on Sunday.....................the RCV .90SP was perfect for the airplane..........ran really good plenty of power for this airplane. Engine mounts with only one hole in the cowl .............for the needle valve.
Flew it without the cowl this weekend until I was sure on all the adjustments were correct.
Flew it without the cowl this weekend until I was sure on all the adjustments were correct.
#32
Senior Member
Talk about splurging! Guess this is why the RCS shines above other engines, lovely for a good scale look. I thought it was 2 holes? One for the starter rod.
#35
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I am about to build my Stuka and use a Saito 100 also. Could you either post pics of the setup or email them to me? How does the motor power the Stuka?
email to: [email protected]
Thanks
Bob
email to: [email protected]
Thanks
Bob
#36
Senior Member
I have one with a saito .91 on it. I mounted mine inverted straight down. I got the flexible pipe from horizon and ran it down and out the bottom cutout of the cowl. I wound up cutting a little in the front for more airflow (the head of the .91 saito doesn't really make it down into the opening). Made a little lite ply brace on the bottom of the motor box to hold the flex pipe towards the end. TO get the throttle where it would really work half way decent I had to put a decent size hole in the firewall and ran a ball link attached to the arm and a metal rod to the servo (mini servo which I made a mount for right behind the tank).
I'm taking it down tomorrow and will take some pictures if I get around to it and get the cowl off. I ran it for the first time last week and put about 1 1/2 tanks thru it, still need to track down some range check problems before I fly it soon. Came in lighter than I thought it would 7.4 pounds all ready to fly minus fuel and that was with 3 oz. of weight on the firewall to balance.
The plane came out "ok" but really the covering was a pain - nothing you do can keep it non-wrinkled. It's the wierdest thing I've ever seen on covering. Most that wrinkle you either get the wrinkle out permanently or it never unwrinkles. Not this stuff, after you shrink it down and go over it with an iron after the gun - the wrinkles come right back in a day or two.
I'm taking it down tomorrow and will take some pictures if I get around to it and get the cowl off. I ran it for the first time last week and put about 1 1/2 tanks thru it, still need to track down some range check problems before I fly it soon. Came in lighter than I thought it would 7.4 pounds all ready to fly minus fuel and that was with 3 oz. of weight on the firewall to balance.
The plane came out "ok" but really the covering was a pain - nothing you do can keep it non-wrinkled. It's the wierdest thing I've ever seen on covering. Most that wrinkle you either get the wrinkle out permanently or it never unwrinkles. Not this stuff, after you shrink it down and go over it with an iron after the gun - the wrinkles come right back in a day or two.
#37
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From: Courbevoie, FRANCE
use a pin to poke small all holes in the covering before using the iron. That will keep the bubbles out and keep your covering sticky.
#38
Senior Member
Done that and a lot more... anytime the covering sees any sun and temps above 85d F it wrinkles up again from a totally flat surface.... considering it's 85 or hotter here 9 months out of the year it sucks.
#40
Senior Member
Here's a pic of a .91 saito installed inverted from the front/side/and back. You can see the flexible exhaust I used and the support I made for it in the back. Front pic shows the cuts I made for more cooling and to show the motor a little. Side view just shows how much better it looks with no cutouts mounted 90d like the manual calls out for.
#41
Senior Member
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I broke my Saito 100 in on my stik for the Stuka. I used the Saito aluminum motor mount which required only re-drilling 2 holes in the firewall and brought the motor closer to the firewall and the specs for the distance of the thrust washer from the firewall. I mounted it with the valve covers protruding at about 7-8 o'clock. The exhaust exits neatly out of the back of the cowl without any cutting to the lower cowl. I have a Hobbico silicone exhaust deflector installed to keep the exhaust from accumulating inside the cowl.
I will probably maiden the Stuka this weekend if the weather permits.
I will probably maiden the Stuka this weekend if the weather permits.
#42
Anyone still on here.
I purchased one of these second hand, not completed and appearently incomplete. I need a set of the inner flaps or I need a small amout of covering to cover ones I could make. Hate to buy a $109 wing set to get the small flaps or $30 worth of covering to cover to pieces of balsa the size of a cracker.
Thanks anyone,
Denny
_____________________________
If a crash is inevitable, hit the softest, cheapest thing you can find, as slowly as possible.
I purchased one of these second hand, not completed and appearently incomplete. I need a set of the inner flaps or I need a small amout of covering to cover ones I could make. Hate to buy a $109 wing set to get the small flaps or $30 worth of covering to cover to pieces of balsa the size of a cracker.
Thanks anyone,
Denny
_____________________________
If a crash is inevitable, hit the softest, cheapest thing you can find, as slowly as possible.
#44
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From: Joplin,
MO
Haven't flown my stuka in over a year. Got the aerobatic bug and that's mostly what I've been doing lately. It's a nice gentle flying plane with no real bad habits and looks killer doing a slow flyby of the runway. Hope your flight went ok.
#45
Flight went uneventfull (no crash) but not entirely sucessful. I have a MDS .68 in this plane and had ran it a few times last winter in the driveway testing with no problems. We could not get that thing to run correctly and it made the plane way underpowered on its first and only two flights. When I got home and unloaded I fiqured it out, I used 15% nitro and that motor hates anything over 10% (which is what I ran it on in the tests). Other than that it took to the skys (after a scary maiden take off) with very little trim required.
That thing is just too ugly to fly!!!!
And I love it!!!!!
That thing is just too ugly to fly!!!!
And I love it!!!!!
#46
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I have about 200 flights on my Stuka. Mine flies great and I have had 2 motors installed. Both have performed well and had plenty of power to haul my Stuka. I first installed a Saito 100 (see above). This engine had plenty of power and is the better engine for this plane of the two that I used. The second engine that I used in it is a YS 110 with a Graupner 14x7 3 blade Graupner prop. This worked great also but was really way mor power than I needed even with a 3-blade prop. I put the Saito 100 back in it and that's how I fly it today.
I disconnected the inner flaps because I had too many problems getting them to work correctly. I use the outer longer flaps but they are not really needed.
If this plane has a dead stick it will not coast. Underpowering this plane is a mistake so, of you have questions about the motor, sw2ap the motor for one that will be enough power.
Also, this plane is not aerobatic in any sense of the word. It takes a long time to roll the plane even when rudder is mixed in.
But, people do take notice when you fly it. I also put whistles in the wheel pants of mine that make a good cheap siren.
I disconnected the inner flaps because I had too many problems getting them to work correctly. I use the outer longer flaps but they are not really needed.
If this plane has a dead stick it will not coast. Underpowering this plane is a mistake so, of you have questions about the motor, sw2ap the motor for one that will be enough power.
Also, this plane is not aerobatic in any sense of the word. It takes a long time to roll the plane even when rudder is mixed in.
But, people do take notice when you fly it. I also put whistles in the wheel pants of mine that make a good cheap siren.
#47
ORIGINAL: proulxlaw
I have about 200 flights on my Stuka. Mine flies great and I have had 2 motors installed. Both have performed well and had plenty of power to haul my Stuka. I first installed a Saito 100 (see above). This engine had plenty of power and is the better engine for this plane of the two that I used. The second engine that I used in it is a YS 110 with a Graupner 14x7 3 blade Graupner prop. This worked great also but was really way mor power than I needed even with a 3-blade prop. I put the Saito 100 back in it and that's how I fly it today.
I disconnected the inner flaps because I had too many problems getting them to work correctly. I use the outer longer flaps but they are not really needed.
If this plane has a dead stick it will not coast. Underpowering this plane is a mistake so, of you have questions about the motor, sw2ap the motor for one that will be enough power.
Also, this plane is not aerobatic in any sense of the word. It takes a long time to roll the plane even when rudder is mixed in.
But, people do take notice when you fly it. I also put whistles in the wheel pants of mine that make a good cheap siren.
I have about 200 flights on my Stuka. Mine flies great and I have had 2 motors installed. Both have performed well and had plenty of power to haul my Stuka. I first installed a Saito 100 (see above). This engine had plenty of power and is the better engine for this plane of the two that I used. The second engine that I used in it is a YS 110 with a Graupner 14x7 3 blade Graupner prop. This worked great also but was really way mor power than I needed even with a 3-blade prop. I put the Saito 100 back in it and that's how I fly it today.
I disconnected the inner flaps because I had too many problems getting them to work correctly. I use the outer longer flaps but they are not really needed.
If this plane has a dead stick it will not coast. Underpowering this plane is a mistake so, of you have questions about the motor, sw2ap the motor for one that will be enough power.
Also, this plane is not aerobatic in any sense of the word. It takes a long time to roll the plane even when rudder is mixed in.
But, people do take notice when you fly it. I also put whistles in the wheel pants of mine that make a good cheap siren.
#49
I flew mine with a 12x8X3 Graupner about five times so far. The plane is very scale and no extra power at all. The MDS .68 could handle some more prop with no problem so I just put a Zinger 13X8 3 blade on it this morning and will try that in a few hours.
Boy, its hard to beet those Saito 100's!!!! They are coming out with a 115 soon I guess, probably the same case as the 100 if I know Saito. That will be cool!!!!!
Boy, its hard to beet those Saito 100's!!!! They are coming out with a 115 soon I guess, probably the same case as the 100 if I know Saito. That will be cool!!!!!
#50
Senior Member
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Saito 100's are very good motors. I have 4. Saito is coming out with a 115 and you are right it does have the same case as the 100 but, if you want the best motor for any .60 size plane try the Saito 125. The 125 is the absolute best motor for any .60 size plane. It has the same footprint as the 100 or Thunder Tiger, OS, etc. .91. The 125 makes about the same power as my YS .91. The only motor that beats the 125 is the YS 110. YS's do however require a great deal more care and attention than the Saito's.
When I first started running the 125, I thought the motor was junk but, after putting about 2 gals through it, it only then began to be powerful.
When I first started running the 125, I thought the motor was junk but, after putting about 2 gals through it, it only then began to be powerful.



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