Guillow's Chipmunk Kit 50-2

[Marc Guerriero]

I am contemplating whether or not to use this spinner that I cut down from a 500 series P 40 warhawk spinner. If I  do use it, it will be painted red of course. But I don't like the way it protrudes out from the nose. It does not look very realistic that way. Any opinions? Thanks, in advance.

Yes I agree - especially as you have done such a neat job of this model. I think I would consider using Tom Hallman's approach or similar - mounting blades on a dowel hub with a separate hollowed out balsa spinner. the blades terminate at the spinner and you only need to drill a hole for the round dowel hub.

https://www.youtube.com/watch?v=lV7z8MGE460&list=PLP6c2w2UvGmeX5W-FBP4SbPbPydcHUBzG&index=17

This may help give you some ideas.

John

Yeah, he makes great props. But I don't have that skill set or the jigs and tools. I think I am just going to go with the simple Comet style sheet wood prop which can be adapted to the spinner that I already cut.

[MKelly]

I tried the Comet 6" printwood prop on a Phantom Fury.  Wasn't expecting much from such a small prop on a 32" span model, but it pulled it up very nicely. I didn't have the model long - that prop pulled it up into a thermal and it drifted away, never to be seen again.

Mike

[Marc Guerriero]

I tried the Comet 6" printwood prop on a Phantom Fury.  Wasn't expecting much from such a small prop on a 32" span model, but it pulled it up very nicely. I didn't have the model long - that prop pulled it up into a thermal and it drifted away, never to be seen again.

Mike

Mike, I was actually inspired by that video to go with the simple Comet sheet wood prop. I think it will work fine. I am going rig up a spring release shaft from a spring that I got from a ball point pen. There will be a wire prop clutch that the prop shaft engages with and the spring will release it when the rubber runs down to free the shaft from the clutch so that the prop can freewheel.

[Marc Guerriero]

I got the blades cut and painted the front. I just have to cut from the back on the lines and glue at a 45 degree angle. I made the blades separate from the hub because I am going to attach them with some flexible plastic to protect against hard landings.

[Marc Guerriero]

Prop hub with spring and clutch:

[Marc Guerriero]

I did not realize that "Cherry Red" had a pinkish hue to it. I thought that it was just going to be a deeper red to match the nose cowl. Now I have a spinner that kind of favors a "Hot Pink".

[Marc Guerriero]

A little more spinner/prop progress:

[Marc Guerriero]

I got the spinner assembly almost done. I still have to glue the spinner to the spinner hub and then sandpaper spinner hub to conform to spinner and then paint to match. It is till a bit of a scale compromise but at least I got the spinner closer to the nose.

[OZPAF]

It's coming on well Marc.

I've never seen a free wheel system like that before. It's very compact.

John

[Marc Guerriero]

It's coming on well Marc.

I've never seen a free wheel system like that before. It's very compact.

John

Yeah, that is what makes it so challenging. The spinner is slightly larger than scale in representation, but I was pushing the limits of minimal internal space for the prop shaft so I had to allow for more room which means that I ended up with a spinner that is bit larger than scale. It still looks better than if I had built the model without a spinner. It is just an experimentation. I have never done it before, so I'll find out by experience how well it will work. The prop shaft goes through a brass eyelet glued to the center of the prop hub.

[pedwards2932]

I designed a freewheel hub for 3D printing.  Uses bamboo sticks and cottage cheese cups for blades.  The design allows you to adjust to the desired pitch and is pretty easy to get a spinner of almost any size.

[Marc Guerriero]

I designed a freewheel hub for 3D printing.  Uses bamboo sticks and cottage cheese cups for blades.  The design allows you to adjust to the desired pitch and is pretty easy to get a spinner of almost any size.

Looks good, do you have a physical example?

[pedwards2932]

The larger prop is 9.5" on a Guillow Arrow.  The Spitfire prop is 6.5".  I don't have any other decent pics.

[Marc Guerriero]

Looks good. You should sell these.

[Piecost]

I agree, I am making a similar propeller, following the Maxfliart Youtube video, and making the brass tube  freewheel part is the mot tricky