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Thimble Drome Props

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Thimble Drome Props

Post  Marleysky on Thu Mar 08, 2018 9:35 pm

I have a couple of White Thimble Drome Props that have a "Warning" on the prop hub that says "Do Not Use on RR-1, Space Bug, Thermal Hopper".  One of them came on a OK cub 049B.  I don't really plan on running them , but am curious as to what engines they would be suited for? ?  one is 5D x 3P, the other is 4.5P x 4P   Any of you guys have any Information on them? Thanks!

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Re: Thimble Drome Props

Post  Admin on Thu Mar 08, 2018 9:54 pm

The RR-1, Space Bug and Thermal Hopper can reach higher RPMs than later reedies can (Babe Bee, Golden Bee, SBjr). Those props may not be able to safely handle those speeds. That note can still be seen on some new props currently available from Matt and Bernie (obviously still using the same old molds).

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Re: Thimble Drome Props

Post  Mark Boesen on Thu Mar 08, 2018 11:23 pm

The 4.5"x4" was made for the 105 Super Cub (single port Babe Bee) not a lot of power needed and not a very efficient prop.
The 5"x3" was for the Water Wizard (#5000)


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Re: Thimble Drome Props

Post  Levent Suberk on Fri Mar 09, 2018 2:03 am

Mark, I want to make a replica propeller stand, seen on left upper corner of the first picture. Can you send to me a scan or a high resolution photo of that propeller sheet?

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Re: Thimble Drome Props

Post  OVERLORD on Fri Mar 09, 2018 10:06 am

I have 1 of those in use. it' a 4,5 x 2,5 on the Pee Wee of my free flight plane Wing Ding. The prop came in an engine lot I bought and was used before. Up until now, it doesn't show any signs of fatigue and stays in 1 piece.

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Re: Thimble Drome Props

Post  KariFS on Fri Mar 09, 2018 12:50 pm

Admin wrote:The RR-1, Space Bug and Thermal Hopper can reach higher RPMs than later reedies can (Babe Bee, Golden Bee, SBjr). Those props may not be able to safely handle those speeds. That note can still be seen on some new props currently available from Matt and Bernie (obviously still using the same old molds).

Those props have rather low load, maybe there is also a risk of over-revving those more powerful engines?
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Re: Thimble Drome Props

Post  Mark Boesen on Fri Mar 09, 2018 10:32 pm

Levent Suberk wrote:Mark, I want to make a replica propeller stand, seen on left upper corner of the first picture. Can you send to me a scan or a high resolution photo of that propeller sheet?

sure send me your email
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Re: Thimble Drome Props

Post  Mark Boesen on Fri Mar 09, 2018 10:35 pm

KariFS wrote:
Admin wrote:The RR-1, Space Bug and Thermal Hopper can reach higher RPMs than later reedies can (Babe Bee, Golden Bee, SBjr). Those props may not be able to safely handle those speeds. That note can still be seen on some new props currently available from Matt and Bernie (obviously still using the same old molds).

Those props have rather low load, maybe there is also a risk of over-revving those more powerful engines?

yep, thats my guess, i think they needed the smaller diameter for the Cub landing gear.
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Re: Thimble Drome Props

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