.40 Engine in Phoenix Sonic?
Anyone who has been following my other thread knows I have an O.S FP Max .40 engine from another plane that is underpowered for that airframe. Would it be advisable to put this engine in this aircraft even though the maximum recommended size is .32?
https://www.towerhobbies.com/cgi-bin...?&I=LXEWXD&P=0 |
Originally Posted by AllModesR/C
(Post 12547556)
Anyone who has been following my other thread knows I have an O.S FP Max .40 engine from another plane that is underpowered for that airframe. Would it be advisable to put this engine in this aircraft even though the maximum recommended size is .32?
https://www.towerhobbies.com/cgi-bin...?&I=LXEWXD&P=0 PS , this is coming from a guy who always goes slightly bigger on the suggested powerplant , within reason , of course ;) |
I put a Tower 40 in a Uproar which also had a 32 size recommendation limit and it flew great. IFRC the FP is a sport engine and not very powerful, much like the Tower 40.
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Originally Posted by AllModesR/C
(Post 12547556)
Anyone who has been following my other thread knows I have an O.S FP Max .40 engine from another plane that is underpowered for that airframe. Would it be advisable to put this engine in this aircraft even though the maximum recommended size is .32?
https://www.towerhobbies.com/cgi-bin...?&I=LXEWXD&P=0 |
Originally Posted by rcjetflyer0718-RCU
(Post 12548057)
I have an Evolution 40NX in my sonic and it flies quite fast. Make sure the fuel you use for the 40 FP has plenty of castor oil and try a 9X7 prop.
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Originally Posted by rcjetflyer0718-RCU
(Post 12548057)
I have an Evolution 40NX in my sonic and it flies quite fast. Make sure the fuel you use for the 40 FP has plenty of castor oil and try a 9X7 prop.
I have a 25FP and the instruction book recommends using a 8X6, 9X5 or 9X6 so using a 9X7 sounds a bit small. I'd be looking at something in the lines of a 10X5 or 6. 18% oil would be fine for your 40FP. In fact, that's what I run in my boats, 18% oil with 50% nitro, never had an oil related problem. Then again, my boat engines run at 25K+ RPM so more oil is a good thing |
9x7 would be about the perfect load for an FP40 and be in its power band. I used to run 9x7 on OS 40 FSR and Webra Speed .40. That being said the 9x7 may not be the best prop for that airplane. |
Originally Posted by Hydro Junkie
(Post 12549026)
Are you sure about using a 9X7?
I have a 25FP and the instruction book recommends using a 8X6, 9X5 or 9X6 so using a 9X7 sounds a bit small. I'd be looking at something in the lines of a 10X5 or 6. 18% oil would be fine for your 40FP. In fact, that's what I run in my boats, 18% oil with 50% nitro, never had an oil related problem. Then again, my boat engines run at 25K+ RPM so more oil is a good thing |
I had a 46fx on a sonic, it was nose heavy but i enjoyed the massive power |
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