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Old 09-23-2009, 08:41 PM
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bodywerks's Avatar
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Bill Hempel 100cc Yak-55M?????

Just maybe!
Mr. Hempel has decided to see if there is a market for smaller versions of the Yak-55M. He has prototypes for both the 50cc and 100cc. I was lucky enough to be asked to give one a try and I chose the 100cc. To me, it is the perfect size for all types of flying.
A few quick specs:
101" wingspan
approx. 1850 squares
92" length, back of rudder to front of cowl
15 pounds as you see it below - basically less radio gear, powerplant, tank, and wheels.
I've built a few 100cc planes and all the equipment added to the airframe usually comes out to about 10-12 pounds. So it looks like this will be a 25-27 pound plane
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Old 09-23-2009, 08:46 PM
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Re: Bill Hempel 100cc Yak-55M?????

WOW, i always wondered if a plane like this did good knife edge and inverted harriers like a regular yak. the lack of fuse behind the bubble worries me.
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Old 09-23-2009, 08:47 PM
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Re: Bill Hempel 100cc Yak-55M?????

A little more info.
This is true, "no glue required" from what I can see - all control surfaces are the pocket-hinge type, which means no glue and, more importantly, no hinge gap sealing!
Oh, and check out the throw! I didn't get a pic of the aileron but it's about 90 degrees
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Last edited by bodywerks; 09-23-2009 at 08:58 PM.
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Old 09-23-2009, 08:51 PM
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Re: Bill Hempel 100cc Yak-55M?????

Quote:
Originally Posted by louu View Post
WOW, i always wondered if a plane like this did good knife edge and inverted harriers like a regular yak. the lack of fuse behind the bubble worries me.
I understand your concern, but at the European XFC(EXFC), 21 out of some 30 planes were Yak55 designs, so I would think that it is of little concern.
Also, the roundness of the entire fuselage and lack of a tall rear deck can actually improve the way the plane rolls and the effectiveness of the rudder response.
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Old 09-23-2009, 08:57 PM
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Re: Bill Hempel 100cc Yak-55M?????

The cowl has a ring in it, with a tongue-and-groove setup to hold the bottom in and three screws(that will be hidden by the hatch) to hold the top in. Pretty sleek. Also worth noting, all the cooling louvers are already cut out - talk about saving a few hours of my time!
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Old 09-23-2009, 09:02 PM
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Re: Bill Hempel 100cc Yak-55M?????

The wings are recessed in the fuse of course, and it came with carbon wing and stab tubes
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Old 09-23-2009, 09:04 PM
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Re: Bill Hempel 100cc Yak-55M?????

Keep it coming! Looks good so far! Build thread please........... good luck!
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Old 09-23-2009, 09:06 PM
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Re: Bill Hempel 100cc Yak-55M?????

Last pics for now:
The inside of the fuse is plenty roomy and the fuse seems very well constructed - and light. There are no provisions for a tail-mounted rudder servo but there is plenty of meat back there that I just might do it if the CG allows. This is a pretty long tail moment so it may not be an option.
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Old 09-23-2009, 09:11 PM
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Re: Bill Hempel 100cc Yak-55M?????

Quote:
Originally Posted by 3dAndrew View Post
Keep it coming! Looks good so far! Build thread please........... good luck!
I do plan to keep up with the build, but this opportunity came as a bit of a surprise to me but the Yak-55M design has grown on me and I never had the means to acquire the larger designs. This 100cc is the perfect size for me so I couldn't resist.
Money is obviously tight and I have the Tucson Shootout just around the corner to focus on so it may be a slow process but I will do my best. Maybe I will do well enough to win the engine I need(DA-100L is the plan)!
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Old 09-23-2009, 09:12 PM
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Re: Bill Hempel 100cc Yak-55M?????

Are the wings built up, or sheeted foam?
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Old 09-23-2009, 09:15 PM
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Re: Bill Hempel 100cc Yak-55M?????

I like it! I already have two 100cc planes completed that I have not flown yet (long story). Bodywerks, if you like how it flies I will have a third.
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Old 09-23-2009, 09:29 PM
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Re: Bill Hempel 100cc Yak-55M?????

Dang the quality of the tail section hinging, and covering looks awesome!
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Old 09-23-2009, 09:41 PM
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Re: Bill Hempel 100cc Yak-55M?????

That thing looks sweet. That 55 design is growing on me big time. It looks like a high quality kit.

Quote:
Originally Posted by bodywerks View Post
I do plan to keep up with the build, but this opportunity came as a bit of a surprise to me but the Yak-55M design has grown on me and I never had the means to acquire the larger designs. This 100cc is the perfect size for me so I couldn't resist.
Money is obviously tight and I have the Tucson Shootout just around the corner to focus on so it may be a slow process but I will do my best. Maybe I will do well enough to win the engine I need(DA-100L is the plan)!
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Old 09-23-2009, 09:57 PM
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Re: Bill Hempel 100cc Yak-55M?????

Quote:
Originally Posted by ericb View Post
Are the wings built up, or sheeted foam?
Good question - they are built-up, and light!
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Old 09-23-2009, 09:58 PM
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Re: Bill Hempel 100cc Yak-55M?????

Quote:
Originally Posted by storklappe View Post
I like it! I already have two 100cc planes completed that I have not flown yet (long story). Bodywerks, if you like how it flies I will have a third.
This is a pre-production prototype so some things might change if he does decide to market them, but I would think very little. It is just a smaller version of his 44% Yak and I can tell you that it flies awesome.
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