Ed_Moorman
Posts: 3684
Joined: 1/5/2002
From: Shalimar,
FL, USA
Status: offline
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mrbcruzn-
The Neptune is a copy of the Seamaster, which is known to be one of the best, if not the best flying boat type seaplanes ever designed. The difference in the two is in construction, as I recall, with the Neptune being the improved version. I have flown a Mariner and a Seamaster and owned a Sea Monster. The Neptune/Seamaster is a fun flying seaplane. Keep it light and you'll have a great plane.
The plane is designed for a .46. An OS .61FX will probably make it nose heavy and you may have prop clearance issues. A better choice for more power would be one of the .52s or an OS .55AX. Same weight, more power. The OS .50SX, which has been discontinued, makes a great combo with the Neptune. A .70 or .72 4-stroke is also good, but you may need a 3-blade prop to clear the fuselage.
As for leaking, any production plane may leak some. I would use silicone seal on the wing saddle, lay on some Saran wrap and bolt the wing on and let it cure. This is the way we did it when we really built planes. Then before a flying session, you can Vasoline the area for a good tight seal. I use Corrosion-X (designed for full scale marine applications) on my radio components, especially the receiver and switch before installing in a water plane. It also makes a good after engine run oil.
When it comes to flying off water, there is more technique involved than on land. If you have seen poor take offs and landings, it is probably that the pilot had not yet gotten used to water flying techniques. A windy day with choppy water can also make it hard on water handling.
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Ed Moorman, AMA 553, KD4QBM, Revver Bro #156
R/C Report Magazine, Fun Aerobatics Column
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Neptune ARF Seaplane question - 
