seaplane / weedeater help...
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seaplane / weedeater help...
ok guys iv just got a nice neptune seaplane 60" nice fuse build and i love the plane all but where and how the motor is mounted... i also want to mount a 26cc weedeater engine iv been working on.
so my questions are
www.valuehobby.com/60in-neptune-seaplane-arf-almost-ready-to-fly.html
is 60"" enough to use the 26cc engine? it did use the K&B .40 nitro engine
also i want to mount the engine on the front and ad landing gear so it will no longer see water.
ill include pics not the greatest but pics none the less...
any help is always appreciated
so my questions are
www.valuehobby.com/60in-neptune-seaplane-arf-almost-ready-to-fly.html
is 60"" enough to use the 26cc engine? it did use the K&B .40 nitro engine
also i want to mount the engine on the front and ad landing gear so it will no longer see water.
ill include pics not the greatest but pics none the less...
any help is always appreciated
#2
RE: seaplane / weedeater help...
I don't think it will work ... I have put 25cc on some planes before, but thats not much wing to be flying off water, with that big motor on board. Also you will probably run a 16-8 two blade prop, or a 15 inch three blade? Clearance will be an issue.
I'd love to see you make it work, but its dicey at best...
I'd love to see you make it work, but its dicey at best...
#4
RE: seaplane / weedeater help...
Given that a 40 engine is 6.5 cc, I think the weedeater engine is a massive overkill. I wouldn't put more than a 61 (10cc) on something like that, but that's just me.
I know that glow engines are less powerful than gas engines of the same displacement, but not by a factor of 4, which is about how much you are increasing the engine size by.
I'd look for a bigger plane to mount that bad boy in.
I know that glow engines are less powerful than gas engines of the same displacement, but not by a factor of 4, which is about how much you are increasing the engine size by.
I'd look for a bigger plane to mount that bad boy in.
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RE: seaplane / weedeater help...
You don't have enough wing area for an engine that size. That engine should go with a wing span of 73+.
Nitro engines are more powerfull then gas engines and are lot lighter.
You can try it but very likely will end with disaster.
Nitro engines are more powerfull then gas engines and are lot lighter.
You can try it but very likely will end with disaster.
#8
RE: seaplane / weedeater help...
I think the smallest airplanes I have flown successfully with a 25 cc conversion was an ugly stick, I can't recall the numbers I sort of used to use as a rule of thumb.. but I think you need a minimum of 900 square inches...
I think the ugly stick was about that many square inches, and weighed around 8 pounds, I had to chop the nose of the plane 4 inches and mount the radio and battery under the stabilizer to balance without using lead.
I think the ugly stick was about that many square inches, and weighed around 8 pounds, I had to chop the nose of the plane 4 inches and mount the radio and battery under the stabilizer to balance without using lead.
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RE: seaplane / weedeater help...
www.dragtimes.com/video-viewer.php
the plane in this video i believe in 1400mm witch is not to much bigger then my seaplane and the thing flys great?
the plane in this video i believe in 1400mm witch is not to much bigger then my seaplane and the thing flys great?
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RE: seaplane / weedeater help...
i was thinking of making small attachable lead plates on the back so it will alow me to balance for what conditions im in?
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RE: seaplane / weedeater help...
and if you look on this site it says 63in = 26cc to 30cc engine http://www.tradekey.com/product-free...cc3408912.html
#16
RE: seaplane / weedeater help...
ORIGINAL: joshrc110
well iv been looking online and 60'' seems to be good for 26cc
??
well iv been looking online and 60'' seems to be good for 26cc
??
You will have to redesign entirely the fuse, chopping off all the nose area, because of the weight of the gas power plant, then you will have to reinforce all the fuse because of the vibrations of the gas power plant. You will end up with a really, really heavy 60" model...
Idea: you could get a model designed for you power plant, like a giant Sweet Stick... and be at the field in one week, having fun...
If you do this, do not forget to video the event, and share.
Good luck!
Gerry
#19
RE: seaplane / weedeater help...
ORIGINAL: bogbeagle
IMO, it'll fly like a plank.
IMO, it'll fly like a plank.
Gerry
#20
RE: seaplane / weedeater help...
Where to start to explain why this is not a good idea?
The plane does not have the overall size or structure to mouint a massive, heavy, magneto ignition 26cc weed whacker enigne.
A website suggesting that a 60" wingspan plane is OK for a 26cc weed whacker engine is of no value. Take a look at something like a 110" span motor glider. You'd never get a 26cc weed whacker on that pencil thin fuselage. You'd have trouble with your .40. There are may more factors to consider for appropriate engine size than simply wingspan.
Look here to see what I mean:
http://www.aerospaceweb.org/question/design/q0214.shtml
The Bumble Bee II plane has a wingspan of 5 ft 6 inches - that's only 66 inches my friend, a measly 6 inches more than your dream machine. It's powered with a Continental C-85, 85hp engine, which makes your weed whacker look like a flea! And there's no way that it would fly with your .40.
Consider this: things work the way they do because that's the way they work.
Nothing in your plane was designed to accomodate that engine. So once you change the wing, change the fuse, add the stilt landing gear, add the ton of lead to balance, overload the wing and rear fuselage structure to accomodate the lead and on and on, what you've got is a mess. And it's no longer the plane with which you started. And neither will its flight characteristics be the same.
If you want a plane for a 26cc weed whacker engine, why not just start with one which is intended to use that size engine?
There are many more issues with your great plan. However, this and everyone else's comments should give you the idea.
The plane does not have the overall size or structure to mouint a massive, heavy, magneto ignition 26cc weed whacker enigne.
A website suggesting that a 60" wingspan plane is OK for a 26cc weed whacker engine is of no value. Take a look at something like a 110" span motor glider. You'd never get a 26cc weed whacker on that pencil thin fuselage. You'd have trouble with your .40. There are may more factors to consider for appropriate engine size than simply wingspan.
Look here to see what I mean:
http://www.aerospaceweb.org/question/design/q0214.shtml
The Bumble Bee II plane has a wingspan of 5 ft 6 inches - that's only 66 inches my friend, a measly 6 inches more than your dream machine. It's powered with a Continental C-85, 85hp engine, which makes your weed whacker look like a flea! And there's no way that it would fly with your .40.
Consider this: things work the way they do because that's the way they work.
Nothing in your plane was designed to accomodate that engine. So once you change the wing, change the fuse, add the stilt landing gear, add the ton of lead to balance, overload the wing and rear fuselage structure to accomodate the lead and on and on, what you've got is a mess. And it's no longer the plane with which you started. And neither will its flight characteristics be the same.
If you want a plane for a 26cc weed whacker engine, why not just start with one which is intended to use that size engine?
There are many more issues with your great plan. However, this and everyone else's comments should give you the idea.
#21
RE: seaplane / weedeater help...
There is a thing called wing loading, maybe you have heard of it or maybe not, this airplane is supposed to come in around 6.5 lbs. that seems heavy in my opinion but whatever, with this pig of an engine you want to place on this tiny platform just what do you think the weight and wing loading will be then? Power is not an antidote for wing loading and never will be so this is a really lame idea with absolutely no valuable point to be made...
Bob
Bob
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RE: seaplane / weedeater help...
There are 40-60 size gas engines. They are beam mounted and electronic ignition and very light. A weedwacker conversion is like mounting a boat anchor to the front. Save that for a quarter scale cub.
Good luck,
Superfli
Good luck,
Superfli
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RE: seaplane / weedeater help...
I say install it and when it returns to kit form you can build it bigger.There is no way that aircraft is anywhere big enough for that engine and it will never 3D not enough wing,tail or rudder how ever it will be an awsome crash.
#25
RE: seaplane / weedeater help...
ORIGINAL: joshrc110
www.dragtimes.com/video-viewer.php
the plane in this video i believe in 1400mm witch is not to much bigger then my seaplane and the thing flys great?
www.dragtimes.com/video-viewer.php
the plane in this video i believe in 1400mm witch is not to much bigger then my seaplane and the thing flys great?
The plane just sits there with the engine running.