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15 or 25 not sure! - 9/23/2007 10:44:29 PM   
spool-it-up


 

Posts: 50
Joined: 2/1/2002
From: Oakwood Hills, IL, USA
Status: offline 		I have a E-Flight cub that i am tired of elec.
Want to convert over to glo and need your input.
I fly this plane off the lake i live on and with floats
the cub ways im going to say about 5+pounds.
Was thinking either a 15size or 25size and also what size
fuel tank and prop.
Just looking for some good responces!
Thanks
John
       Post #: 1

RE: 15 or 25 not sure! - 9/23/2007 11:29:34 PM   
Cyclic Hardover



Posts: 7238
Joined: 5/7/2002
From: New Mexico, USA
Status: offline 		5lb Cub? Cheap .40? Definitely not a .15 and I wouldn't try it with a .25.

< Message edited by Cyclic Hardover -- 9/23/2007 11:35:42 PM >

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RE: 15 or 25 not sure! - 9/23/2007 11:34:50 PM   
AMB


 

Posts: 3965
Joined: 6/10/2003
From: winter park, FL, USA
Status: offline 		with a 5lb plane on floats you need at least a 25 a 10x5 or 10x6 would be worth a try, 6 to 8 oz tank. and diesel would be a consideration also, with the added torque it would give the
umph of at least a 35 glow martin and Cyclic is right a 25 is marginal 5lbs is a 40

< Message edited by dieseldan -- 9/23/2007 11:37:32 PM >

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RE: 15 or 25 not sure! - 9/23/2007 11:49:30 PM   
Cyclic Hardover



Posts: 7238
Joined: 5/7/2002
From: New Mexico, USA
Status: offline 		Hey, what brand and size is this? may not be as heavy as you think? I fly this thing with a.15CVA. More than enough power. They say flying weight is 32oz. I doubt I'm much past that substituting eng and tank for those heavy batteries.

http://www.horizonhobby.com/Products/Default.aspx?ProdID=SEA7000

< Message edited by Cyclic Hardover -- 9/24/2007 1:33:13 AM >

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RE: 15 or 25 not sure! - 9/24/2007 12:16:43 AM   
Flyboy Dave



Posts: 13522
Joined: 3/20/2002
From: San Bernardino County, CA, USA
Status: offline 		What is the wingspan ? I'm thinking more like a 40/46 as well.

FBD.

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RE: 15 or 25 not sure! - 9/24/2007 1:05:31 AM   
Uncas


 

Posts: 453
Joined: 9/2/2003
From: St. Peters, MO,
Status: offline 		If it weighs 5 lbs I would use a .46. If this was electric you must have had a real powerful setup. I would recheck the weight like Cyclic Hardover mentioned. I am thinking a .15 would be used on a 2 lb plane. (32oz).

The OS .40LA puts out a max of 1 hp, that's 746 watts, which is a lot of battery.

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RE: 15 or 25 not sure! - 9/24/2007 2:25:29 AM   
Flyboy Dave



Posts: 13522
Joined: 3/20/2002
From: San Bernardino County, CA, USA
Status: offline 		.... http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXFV69&P=SM



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An engineer says.... "That won''t work".
A mechanic says..."Oh yeah, watch this".
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RE: 15 or 25 not sure! - 9/24/2007 5:19:26 AM   
Ed Cregger


 

Posts: 8078
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: online
quote:

ORIGINAL: dieseldan

with a 5lb plane on floats you need at least a 25 a 10x5 or 10x6 would be worth a try, 6 to 8 oz tank. and diesel would be a consideration also, with the added torque it would give the
umph of at least a 35 glow martin and Cyclic is right a 25 is marginal 5lbs is a 40



------------------


I'm going to have to schedule some time to be around you or Mr. Davis when you or he flies a Diesel conversion. I have yet to have a converted glow to Diesel engine produce as much power as glow, much less more. It's not that I don't give you fellows the benefit of the doubt, but your experience runs contrary to mine.

I agree that 5 lbs. OAW would be forty territory. Of course, the wingspan/wingarea also makes a difference.

What is the size of this Cub? Wingspan? Wingarea?


Ed Cregger


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RE: 15 or 25 not sure! - 9/25/2007 12:17:23 AM   
spool-it-up


 

Posts: 50
Joined: 2/1/2002
From: Oakwood Hills, IL, USA
Status: offline 		http://www.e-fliterc.com/Products/TechnicalSpecs.aspx?ProdID=EFL4000

This is what i have guys and thanks for some input.
John
Also was reading that some guys where using 15s 25s and even small 4strokes
just looking for some input.
John

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RE: 15 or 25 not sure! - 9/25/2007 1:21:25 AM   
Cyclic Hardover



Posts: 7238
Joined: 5/7/2002
From: New Mexico, USA
Status: offline 		Saw the link, I think I'll stay with a .40

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RE: 15 or 25 not sure! - 9/25/2007 2:20:04 AM   
oceansfiftyseven



Posts: 176
Joined: 9/29/2004
From: Seattle, WA, USA
Status: offline 		I think a .25 FX with a 10x4 would be the minimum. 40 is more like it.

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RE: 15 or 25 not sure! - 9/25/2007 3:06:02 AM   
Flyboy Dave



Posts: 13522
Joined: 3/20/2002
From: San Bernardino County, CA, USA
Status: offline 		....I'd put a K&B .61 in it, or a Magnum .91 four stroke. Seaplanes have almost
twice the drag on them when airborne, and getting airborne takes a lot of power.

A .40, even a ,46 would be minimal in any 62 inch plane, much less a seaplane.

FBD.

_____________________________

An engineer says.... "That won''t work".
A mechanic says..."Oh yeah, watch this".
"Old Age, and Treachery will overcome youth and skill".
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       Post #: 12

RE: 15 or 25 not sure! - 9/25/2007 3:24:08 AM   
Cyclic Hardover



Posts: 7238
Joined: 5/7/2002
From: New Mexico, USA
Status: offline
quote:

ORIGINAL: Flyboy Dave

....I'd put a K&B .61 in it, or a Magnum .91 four stroke. Seaplanes have almost
twice the drag on them when airborne, and getting airborne takes a lot of power.

A .40, even a ,46 would be minimal in any 62 inch plane, much less a seaplane.

FBD.



I thought about that but never owned one. Would think they take a bit of "oomph" to get off the water.
Bet they slow down good. Plenty of runway eh? Thing about floats is they can make the ugliest plane look real good.

< Message edited by Cyclic Hardover -- 9/25/2007 3:26:22 AM >

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