installation of FT-300  
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installation of FT-300 - 12/2/2007 3:59:21 PM   
sunnyin


 

Posts: 28
Joined: 4/1/2004
From: LudhianaPunjab, INDIA
Status: offline 		h how to install ft-300 on a giant scale J-3 cub 1/4 scale
       Post #: 1

RE: installation of FT-300 - 12/3/2007 1:59:49 PM   
Prop_Washer2


 

Posts: 107
Joined: 8/14/2003
From: El Paso, TX, USA
Status: offline 		An Ft-300 is way too big for just a Quarter Scale Cub. Typically a four stroke 1.20 or twin 1.30 would be your upper size limit. 1/4 scale aint that gig anymore. The Ft-300 would be more suited for a 1/3 scale cug. An FT-300 is 50cc, most 1.3 scale cub's use 62 to 80 cc 2-stroke gas. Gasoline is not as powerful as Nitro-Methane soooo....a 50 cc Nitro engine can suffice. Where in the hell did you get the idea of a 50cc in a 1/4 scale cub??? I fly mine with a Saito .91....????

Full Size Cub= 36 ft. wingspan
1/2 scale = 18 ft.
1/3 scale = 12 ft.
1/4 scale = 9 ft

so on and so fourth...

_____________________________

"I ran out of ideas and altitude at the same time"

(in reply to sunnyin)
       Post #: 2

RE: installation of FT-300 - 12/3/2007 2:39:44 PM   
Flying freak


 

Posts: 1363
Joined: 6/29/2006
From: granby, QC, CANADA
Status: offline
quote:

ORIGINAL: Prop_Washer2

An Ft-300 is way too big for just a Quarter Scale Cub. Typically a four stroke 1.20 or twin 1.30 would be your upper size limit. 1/4 scale aint that gig anymore. The Ft-300 would be more suited for a 1/3 scale cug. An FT-300 is 50cc, most 1.3 scale cub's use 62 to 80 cc 2-stroke gas. Gasoline is not as powerful as Nitro-Methane soooo....a 50 cc Nitro engine can suffice. Where in the hell did you get the idea of a 50cc in a 1/4 scale cub??? I fly mine with a Saito .91....????

Full Size Cub= 36 ft. wingspan
1/2 scale = 18 ft.
1/3 scale = 12 ft.
1/4 scale = 9 ft

so on and so fourth...



Yes and the piper j3
Full scale = 65hp
1/2 scale = 32.5 hp
1/3 scale = 21.666 hp
1/4 scale =16.25 hp

since os claims it puts out 4 HP to be "scale" your under powered no?



Steven

(in reply to Prop_Washer2)
       Post #: 3

RE: installation of FT-300 - 12/3/2007 8:39:21 PM   
Prop_Washer2


 

Posts: 107
Joined: 8/14/2003
From: El Paso, TX, USA
Status: offline 		You cannot use those figures based on Horsepower. As size goes up, power goes up exponentialy. I don't have the formula for you, but 12-15hp motors fly IMAC (Extra's, Caps, etc...) routinely and they can do much more than thier fullscale counterparts. If you hung a DA 150 cc (16 hp) on a little 1/4 scale cub it would rip the wings off guaranteed. Trust me, a 1.20 four stroke flies a 1/4 scale Cub very well. Look at the specs for engine requirements for any 1/4 scale Cub...

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXMUL8&P=ML

http://ecsvr.com/twm/ShopDisplayproducts.asp?Search=Yes

http://ecsvr.com/twm/ShopDisplayproducts.asp?Search=Yes

http://www.wholesaletrains.com/Detail.asp?ID=200481494 (20cc is 1.2 Cu.In.)

http://www.hobbyoutlets.com/hangar9/HAN1650.htm

http://www.wholesaletrains.com/Detail.asp?ID=200459803

The 1.60 usually refers to the OS or Magnum Flat Twin 1.60 4-stroke, which has less power than a Saito 1.50 four stroke. I don't know what else to tell you...an FT-300 is way too much...I have been flying these things for 30 years, but what do I know... Do a little research. The FT-300 would be a good choice for a 1/3 rd scale...see the specs on the motor on the last link I copied... Do a search on RCU in the Forums on "Cubs", find a thread that addresses 1/4 scale size, and see what everyone else is using. Just trying to help you here buddy...

http://www.hobbypeople.net/gallery/121200.asp

Using your formula, a 1/4 scale Extra 300 (300 hp) would have a 75 horsepower motor. Most 1/4 Extras fly with a 1.20 to a 1.80 size engine. Most 1/3 scale Extras fly with a 100 cc motor which is 6.1 cu. in. (10-12hp) not 100 hp as in using your formula. Like I say the bigger they get they need more power. I have seen may 1/4 scale cubs fly with a .61 (10cc) 2-stroke...


< Message edited by Prop_Washer2 -- 12/3/2007 8:44:34 PM >

_____________________________

"I ran out of ideas and altitude at the same time"

(in reply to Flying freak)
       Post #: 4

RE: installation of FT-300 - 12/6/2007 3:16:06 AM   
bbagle1


 

Posts: 418
Joined: 1/15/2007
From: baton rouge, LA, USA
Status: offline 		That system of calculating horsepower has to be a joke right? It is about power to weight ratio. Figure out a full scale cub's HP per pound and apply that to the all up weight of a quarter scale cub. I think you will find most of our RC models are grossly overpowered.

(in reply to Prop_Washer2)
       Post #: 5

RE: installation of FT-300 - 12/6/2007 6:01:53 AM   
rcdude7


 

Posts: 1131
Joined: 4/12/2003
From: Maryland
Status: offline
quote:

ORIGINAL: Flying freak


quote:

ORIGINAL: Prop_Washer2

An Ft-300 is way too big for just a Quarter Scale Cub. Typically a four stroke 1.20 or twin 1.30 would be your upper size limit. 1/4 scale aint that gig anymore. The Ft-300 would be more suited for a 1/3 scale cug. An FT-300 is 50cc, most 1.3 scale cub's use 62 to 80 cc 2-stroke gas. Gasoline is not as powerful as Nitro-Methane soooo....a 50 cc Nitro engine can suffice. Where in the hell did you get the idea of a 50cc in a 1/4 scale cub??? I fly mine with a Saito .91....????

Full Size Cub= 36 ft. wingspan
1/2 scale = 18 ft.
1/3 scale = 12 ft.
1/4 scale = 9 ft

so on and so fourth...



Yes and the piper j3
Full scale = 65hp
1/2 scale = 32.5 hp
1/3 scale = 21.666 hp
1/4 scale =16.25 hp

since os claims it puts out 4 HP to be "scale" your under powered no?



Steven



You're way off. A 1.20 to 1.50 fourstroke single is perfect for a 1/4 scale cub, and it's still a little overpowered yet.

(in reply to Flying freak)
       Post #: 6

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