Hi all. Im taking a break from the serious stunt plane building and started on a 1/2a Tsunami. The profile side view is scale. My question is about Spinners. I need to use a 1.5" spinner on it. I've never tried using a large spinner on a TD 049 before. Have any of you? That's a pretty big spinner for such a small engine. Maybe Im wrong and it will work? I hope so. Do you think it will cause too big of a power loss?     Kevin.

Main concern would be that it fits concentrically & flat , to the prop driver etc .

Being two types -

The machined backplate to prop driver type ,
&
the cheap plastic - to front of prop - screwed on nosecone ,type .( which depends on a flat parrallel surfaced prop . Preferably with a good diameter ( not tinny ) hub ) .

SO . . Ne Nah Ne Nahhh . if the flash type , getting a good interface to the engine / prop driver , is essential .

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Running a three inch , screw together ( allen screws ) 3 blade & screw or 2 blade 4 screw modified to 4 blade ,

with a one ounce weight , 0.6 ounce Extn. type nut to carry it , 3 in plastic spinner & 12 inch carbon 3 blade prop,

Theres 5 1/2 ounces doing its thing , out in front . So we do the nut up tight ! .Spins concentric , no worries .

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Theres the Goldberg Etc recessed backplate , rebated mateing join , two allen screw , plastic 1 1/2 inch Dia. type .

These might be the best bet ( fairly light ) . The plastic center ' diameter matcher ' to the shaft , seems o.k. , on he 3 inch one .

Might pay to find a fancey ' grade ' allen screw , or better , screw in stud . Maybe with a fine steel tube over , to match prop & spinner I.D. .

Plastic ones though , crushing the backplate gets it spinning out of whack , and worries your ply nose ring , so Alumniums more durable .

Plastic spinner with custom alloy backplate would seem perhaps the best, then .

Can’t help with the spinner question but I want your 1/2a Tsunami plans please.

This will be a new design George, and
 I don't have the plane or any plans for the 1st one. I will save the drawings for you on the new one though.        Kevin.

This will be a new design George, and
 I don't have the plane or any plans for the 1st one. I will save the drawings for you on the new one though.        Kevin.

Thanks Kevin.  Saw your last one and loved it. 

George

i have a new veco 1.5 spinner with a solid back plate .i can machine the back plate and the cox thrust washer to be true . cut the head off of a 5/40 screw to make a stud.make a new prop nut and spinner cone to take a 5/40 allen should be true all the way. Rad

@ Bob. Is the spinner you have all aluminum? Because I want to keep the weight down, I would like to try a plastic or carbon fibre one 1st. If its tail heavy, I might consider using aluminum. Thanks for the offer though!👍