GP Big Stik .40 engine?
08-15-2009 | 11:08 AM
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From: Houston, TX
GP Big Stik .40 engine?
Just orderd the Stik. Question on what engine to use though. I have a nib Magnum XLS .52A set aside for my SSE build. And I have a Magnum .52 4-stroke on my LT-40. I much prefere 4-strokes over 2-strokes, but I dont want to be under powered.
I had a long drawn out post, but I guess I timed out and couldnt post it. Ill add more in a minute.
Thanks
I had a long drawn out post, but I guess I timed out and couldnt post it. Ill add more in a minute.
Thanks
08-15-2009 | 11:13 AM
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From: Houston, TX
RE: GP Big Stik .40 engine?
Cliffs note version. 4-stroke, better mileage, more torque, heavier, larger prop, taller landing gear, maybe conversion to tail dragger and cooler sound.
2-stroke. Plug and play, more power, less mileage, lighter.
What say yall?
2-stroke. Plug and play, more power, less mileage, lighter.
What say yall?
08-15-2009 | 12:07 PM
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From: The Villages, Florida NJ
RE: GP Big Stik .40 engine?
First:
You have the perfect combo on the LT-40. I had a LT-40 that I put 13~14 different engines on, the best I found was the Saito 50 and the LA40, so your Mag 52 = my Saito 50. The LT-40 doesn't like to be overpowered.
On your stick, they can stand overpowering and a tail-wheel so I'd go with about a 60 size four-stroke.
4C vs. 2C that's personal so do what you enjoy, I personally like the 4C most the time, but on something like a Diamond Dust there's nothing like a 2C with a pipe.
To save yourself from the dreaded timeout copy your reply before you send it, then if you get the time out message just paste it and post it.
You have the perfect combo on the LT-40. I had a LT-40 that I put 13~14 different engines on, the best I found was the Saito 50 and the LA40, so your Mag 52 = my Saito 50. The LT-40 doesn't like to be overpowered.
On your stick, they can stand overpowering and a tail-wheel so I'd go with about a 60 size four-stroke.
4C vs. 2C that's personal so do what you enjoy, I personally like the 4C most the time, but on something like a Diamond Dust there's nothing like a 2C with a pipe.
To save yourself from the dreaded timeout copy your reply before you send it, then if you get the time out message just paste it and post it.
08-15-2009 | 02:47 PM
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RE: GP Big Stik .40 engine?
The BS40 is a nose heavy plane, even with a TT46 she is nose heavy. So watch what engine you will use on her.
The 52 4C will give you decent power in my opinion as they will turn a 12x6 at about 10,000 RPM. The Magnum 52 2C is a nice engine. Stick that in with an 11x5 or 11x6 event and she is lovely, you should get about 13,500+ RPMs on 5% nitro. Some even fly her with an 11x7 (around 12,500+ RPM) or a 12x6 (around 12,000 RPMs). I would go with the 52 2C engine, its simple and you can easily back flip the prop to start her ...
The 52 4C will give you decent power in my opinion as they will turn a 12x6 at about 10,000 RPM. The Magnum 52 2C is a nice engine. Stick that in with an 11x5 or 11x6 event and she is lovely, you should get about 13,500+ RPMs on 5% nitro. Some even fly her with an 11x7 (around 12,500+ RPM) or a 12x6 (around 12,000 RPMs). I would go with the 52 2C engine, its simple and you can easily back flip the prop to start her ...
08-15-2009 | 05:43 PM
#5
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RE: GP Big Stik .40 engine?
For a few years I used a Big Stick 40 for an engine test and break-in plane for both 2 strokes and 4 strokes. I counted one time and I ran 16 different engines on it. You can see on the nose shot that I have an external throttle pushrod. I used this for 4-strokes.
The smallest engine I had on it was a Saito .56 and it wasn't nearly enough power. The largest engine was a Magnum .70 4-stroke. Power was OK, but not as much as a good .46 2-stroke. I aso have 2 Magnum .52 4-strokes and, while they are good running engines, they would be better on a lighter and slightly smaller plane.
It does build nose heavy, so I moved the rudder servo to the rear and added 2-56 rod tail braces, as shown in the photo.
A .46 is excellent. The Maggie .52 XLS or an OS .55AX will really haul it.
I would suggest building the plane without the rudder & elevator servos. Then tape or rubber band them on the outside to check the CG. You may need both mounted in the rear.
The smallest engine I had on it was a Saito .56 and it wasn't nearly enough power. The largest engine was a Magnum .70 4-stroke. Power was OK, but not as much as a good .46 2-stroke. I aso have 2 Magnum .52 4-strokes and, while they are good running engines, they would be better on a lighter and slightly smaller plane.
It does build nose heavy, so I moved the rudder servo to the rear and added 2-56 rod tail braces, as shown in the photo.
A .46 is excellent. The Maggie .52 XLS or an OS .55AX will really haul it.
I would suggest building the plane without the rudder & elevator servos. Then tape or rubber band them on the outside to check the CG. You may need both mounted in the rear.
08-15-2009 | 11:00 PM
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RE: GP Big Stik .40 engine?
Ed ... the pull-pull is nice. 
Balances the plane much better I am sure.
Gary ... just a word of caution, do not fly her too hard, meaning, yanking the elevator hard when you have speed etc. The area in front of the H stab's leading edge will crack or break.
Balances the plane much better I am sure.Gary ... just a word of caution, do not fly her too hard, meaning, yanking the elevator hard when you have speed etc. The area in front of the H stab's leading edge will crack or break.
08-16-2009 | 07:27 AM
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From: Houston, TX
RE: GP Big Stik .40 engine?
ORIGINAL: tIANci
Ed ... the pull-pull is nice. Balances the plane much better I am sure.
Gary ... just a word of caution, do not fly her too hard, meaning, yanking the elevator hard when you have speed etc. The area in front of the H stab's leading edge will crack or break.
Ed ... the pull-pull is nice.
Balances the plane much better I am sure.Gary ... just a word of caution, do not fly her too hard, meaning, yanking the elevator hard when you have speed etc. The area in front of the H stab's leading edge will crack or break.
I read about that. Ill beef up that area.
Thanks for the help guys. As much as I wanted to hang the .52 4-stroke on the Stik, I pretty much knew it would be underpowered. Maybe I can work some extra over time next week and get another Saito.
08-19-2009 | 04:57 PM
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RE: GP Big Stik .40 engine?
I had to bring this back up guys. I'm confused. This is a cut and paste asking my local guys on my forum.
My GP Big Stik 40 will show up tomarrow. Tonight Ill start stripping the electronics out of the trainer and pull the Mangum 52 4 stroke out. Orginally I wanted to put that motor in the Big Stik and save the 52 2 stroke for the SSE. But I went and asked the guys on RCU and naturally they said no, it would be underpowered. All I got was confused.
The Magnum 52 rfs has enough power to pull the LT-40 weighing in at about 7 lbs dang near unlimited vert, but not enough power to pull a 5 1/2 lb Big Stik off the ground with allmost identical wing loading?
Magnum 52 2 stroke recommended prop for break in. 10x6 after that, possibly up to a 11x6.
My magnum 52 4 stroke. Im running a 12x5 prop with 10% nitro. If I upped the nitro to 15% with the 12x5 MAS K series, or possibly a 12x6 prop, I think it would pull the Stik just fine. May not be a speed demon, but thats not what I want just yet. Just a smaller plane that has a little more aerobatic ability over the 4*, and still fly slow when I want to. Torque over RPM so to speak. A Harley, not a Ninja.
What to do, what to do?
My GP Big Stik 40 will show up tomarrow. Tonight Ill start stripping the electronics out of the trainer and pull the Mangum 52 4 stroke out. Orginally I wanted to put that motor in the Big Stik and save the 52 2 stroke for the SSE. But I went and asked the guys on RCU and naturally they said no, it would be underpowered. All I got was confused.
The Magnum 52 rfs has enough power to pull the LT-40 weighing in at about 7 lbs dang near unlimited vert, but not enough power to pull a 5 1/2 lb Big Stik off the ground with allmost identical wing loading?
Magnum 52 2 stroke recommended prop for break in. 10x6 after that, possibly up to a 11x6.
My magnum 52 4 stroke. Im running a 12x5 prop with 10% nitro. If I upped the nitro to 15% with the 12x5 MAS K series, or possibly a 12x6 prop, I think it would pull the Stik just fine. May not be a speed demon, but thats not what I want just yet. Just a smaller plane that has a little more aerobatic ability over the 4*, and still fly slow when I want to. Torque over RPM so to speak. A Harley, not a Ninja.
What to do, what to do?
08-19-2009 | 09:22 PM
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From: The Villages, Florida NJ
RE: GP Big Stik .40 engine?
ORIGINAL: GaryHarris
My GP Big Stik 40 will show up tomarrow. Tonight Ill start stripping the electronics out of the trainer and pull the Mangum 52 4 stroke out. Orginally I wanted to put that motor in the Big Stik and save the 52 2 stroke for the SSE. But I went and asked the guys on RCU and naturally they said no, it would be underpowered. All I got was confused.
The Magnum 52 rfs has enough power to pull the LT-40 weighing in at about 7 lbs dang near unlimited vert, but not enough power to pull a 5 1/2 lb Big Stik off the ground with allmost identical wing loading?
What to do, what to do?
My GP Big Stik 40 will show up tomarrow. Tonight Ill start stripping the electronics out of the trainer and pull the Mangum 52 4 stroke out. Orginally I wanted to put that motor in the Big Stik and save the 52 2 stroke for the SSE. But I went and asked the guys on RCU and naturally they said no, it would be underpowered. All I got was confused.
The Magnum 52 rfs has enough power to pull the LT-40 weighing in at about 7 lbs dang near unlimited vert, but not enough power to pull a 5 1/2 lb Big Stik off the ground with allmost identical wing loading?
What to do, what to do?
Use the 52 and have fun, don't treat it like a NASA job.
08-20-2009 | 10:01 AM
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From: Denver, CO
RE: GP Big Stik .40 engine?
I just built a Big Stik 60 and if the 40 size is as fun as the 60, you're in for blast. My model came out nose heavy, even with the elevator servo mounted on the side of the fuse near the tail. I would suggest not gluing the vertical stab until you have the plane balanced. Build the model out till it's ready to fly. Then do a CG check with the vertical stab mounted in the fuse, but not glued in. You'll more than likely need to add a couple ounces of lead to the tail section. If so, glue the lead inside the fuse where the vertical stab will mount. This way you don't need to mount the lead on the exterior of the model. Recheck the CG and once it's balanced, then glue in the vertical stab.
Also, I would suggest adding tailwires from the vertical to horizontal stab. As someone else noted, I was told the area of the fuse in front of the horizontal stab is weak. So I epoxied two popsicle sticks inside the fuse in that general area before gluing in the vertical stab. If you can, go with more engine. I'm running a 90 2 stroke and I can tell you blasting off to "blue angels" vertical climb out from takeoff is the most fun you can have.
Also, I would suggest adding tailwires from the vertical to horizontal stab. As someone else noted, I was told the area of the fuse in front of the horizontal stab is weak. So I epoxied two popsicle sticks inside the fuse in that general area before gluing in the vertical stab. If you can, go with more engine. I'm running a 90 2 stroke and I can tell you blasting off to "blue angels" vertical climb out from takeoff is the most fun you can have.
08-20-2009 | 10:20 AM
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From: Denver, CO
RE: GP Big Stik .40 engine?
tIANci - I think your friend may be able to make a moon shot with a 120 sized engine. He'll probably need to add quite a bit of lead in the tail though, but so what. My club is at altitude (above 5500 feet) and 90 two stoke is perfect.
BTW...thanks goes out to folks like Ed, Gene, John and Tom for helping me with this build.
BTW...thanks goes out to folks like Ed, Gene, John and Tom for helping me with this build.
08-21-2009 | 01:44 PM
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From: Rising Sun,
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RE: GP Big Stik .40 engine?
Ive got that plane with a 61 GMS on it and it flies so fast Im waiting for the wings to tear off of it. Ive been pushing it waiting to see what will happen, but so far it just keeps flying. Denver Jayhawk has a 91 on his 60 size and Im sure his runs the same way. These planes are a blast to fly.
08-21-2009 | 02:09 PM
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From: Houston, TX
RE: GP Big Stik .40 engine?
I missed the UPS guy yesterday and should receive the plane in about 40 minutes. What a LONG day at work today! lol
I'm gonna go ahead and put the 52 2C on it. Ive only been flying for 4 months and its time I act MANLY! [>:]
I'm gonna go ahead and put the 52 2C on it. Ive only been flying for 4 months and its time I act MANLY! [>:]
08-21-2009 | 02:44 PM
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From: Denver, CO
RE: GP Big Stik .40 engine?
I flew on wednesday after work. I decided to give it a go with all high rates. This plane is an absolute blast to fly. Rolls, loops, hammerheads, blenders, split s, emmlemans, even hovering are terrific and like it's on rails. Best of all, it lands more slowly than my Nexstar and doesn't get pushed around at all by the wind on final. The other cool thing is it makes this neat whistling sound when in a dive at idle throttle. Probably something to do with the firewall and lack of cowling against the wind.
01-19-2010 | 06:38 PM
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From: tomsriver,
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RE: GP Big Stik .40 engine?
put a 46tt or OS 46 and fly the hell out of it, that plane is made to fly, and to learn new things , dont baby it, fly it hard and learn from it
01-19-2010 | 10:03 PM
#23
RE: GP Big Stik .40 engine?
Looks like you found an old, dead thread!
I had an OS .70 II four-stroke in mine. Also converted it to a tail-dragger. Was a wonderful marriage and remains the only model I've ever lost to a mid-air.
Best winter ski-plane I've ever owned.
I had an OS .70 II four-stroke in mine. Also converted it to a tail-dragger. Was a wonderful marriage and remains the only model I've ever lost to a mid-air.
Best winter ski-plane I've ever owned.
01-20-2010 | 03:25 AM
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RE: GP Big Stik .40 engine?
ORIGINAL: GaryHarris
I had to bring this back up guys. I'm confused. This is a cut and paste asking my local guys on my forum.
My GP Big Stik 40 will show up tomarrow. Tonight Ill start stripping the electronics out of the trainer and pull the Mangum 52 4 stroke out. Orginally I wanted to put that motor in the Big Stik and save the 52 2 stroke for the SSE. But I went and asked the guys on RCU and naturally they said no, it would be underpowered. All I got was confused.
The Magnum 52 rfs has enough power to pull the LT-40 weighing in at about 7 lbs dang near unlimited vert, but not enough power to pull a 5 1/2 lb Big Stik off the ground with allmost identical wing loading?
Magnum 52 2 stroke recommended prop for break in. 10x6 after that, possibly up to a 11x6.
My magnum 52 4 stroke. Im running a 12x5 prop with 10% nitro. If I upped the nitro to 15% with the 12x5 MAS K series, or possibly a 12x6 prop, I think it would pull the Stik just fine. May not be a speed demon, but thats not what I want just yet. Just a smaller plane that has a little more aerobatic ability over the 4*, and still fly slow when I want to. Torque over RPM so to speak. A Harley, not a Ninja.
What to do, what to do?
I had to bring this back up guys. I'm confused. This is a cut and paste asking my local guys on my forum.
My GP Big Stik 40 will show up tomarrow. Tonight Ill start stripping the electronics out of the trainer and pull the Mangum 52 4 stroke out. Orginally I wanted to put that motor in the Big Stik and save the 52 2 stroke for the SSE. But I went and asked the guys on RCU and naturally they said no, it would be underpowered. All I got was confused.
The Magnum 52 rfs has enough power to pull the LT-40 weighing in at about 7 lbs dang near unlimited vert, but not enough power to pull a 5 1/2 lb Big Stik off the ground with allmost identical wing loading?
Magnum 52 2 stroke recommended prop for break in. 10x6 after that, possibly up to a 11x6.
My magnum 52 4 stroke. Im running a 12x5 prop with 10% nitro. If I upped the nitro to 15% with the 12x5 MAS K series, or possibly a 12x6 prop, I think it would pull the Stik just fine. May not be a speed demon, but thats not what I want just yet. Just a smaller plane that has a little more aerobatic ability over the 4*, and still fly slow when I want to. Torque over RPM so to speak. A Harley, not a Ninja.
What to do, what to do?
Gary, the best thing to do would be to go to the RJL website and order an Edson Universal Adjustable Engine Mount. Install that on the nose of your Big Stik 40 and then you will be able to try any engine that you want to try on your model. I have fun taking an afternoon and flying four or five different engines on the same model because of the Edson mount and its capabilities. Then you will know which engine is best for you.
Ed Cregger
