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HomeScaleAircraftHelicopterScale Model RC Helicopters › Restoration of Hirobo Mh-10 BK-117
02-06-2006 02:20 PM  12 years agoPost 1
Wemo

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Hampton Roads, VA

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Well...I found one of my favorite 3 scale helis, one of which is the BK-117. It is a 1988 Hirobo Mh-10 Bk-117. I love it...the size is perfect. The body is made of ABC plastic and being close to 18 years of age...it was in good condition. The detail is excellent. Only thing that doesn't make it a really scale is the abscence of the 45 degree tail. Hirobo was quite inventive by the way the mechanics works. The swatch plate is below fan and the servos forward and operate below to connect to the swatchplate. I have to replace all of them.

It is powered by an OS CZ .15 MAX engine. After all of those years...it was stored with after oil which served to be a great insurance plan. It has great compression. I took everything thing down and the inside was prestine. The main gear is a whopping 136T (no misprint) with a 4.25" diameter. The motor pinion has a 14T and all of this is belt driven. The fan has 14 fins to provide a lot of air. It uses a spring clutch.

I will replicate the German ADAC Bk-117, which is bright yellow. I've already started the priming and sanding. From what I've read, This model didn't catch on because of the body to weight ratio (the performance wasn't there), but after of 20 years of technology, ie, lithium batteries, gyros and Rx weight it should perform better. I can't wait to hear the engine and the heli come back to life. My digital camera clunked out last night, but I was fortunate to get some pics before the camera clunked out so I'll post some tonight and will get pics when it is finished.

"How high do they go? Are those things hard too fly? How much do they cost?

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02-06-2006 04:46 PM  12 years agoPost 2
wolfdad

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Southern Maryland

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Sounds like an outstanding project. Wish you the best of luck and will anxiously await both pics and successful flights.
wolfdad sends...

"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105

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02-06-2006 04:49 PM  12 years agoPost 3
RobRoy

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Huntsville, Alabama

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Sounds interesting, can't wait to see the pic's.


.

Ignorance is curable, stupidity is for life.

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02-08-2006 09:57 PM  12 years agoPost 4
Wemo

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Hampton Roads, VA

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Thanks...Wolfdad surprisingly...your BK-117 really influenced me to get it. It won't be like your Vario. BTW, did you get you use to flying the multiple head? Hey, are you planning coming down to the funfly this year in Va Beach, at Fentress? If I won the lottery I would get the Vario Skycrane, BK-117 and the CH-53...

I got my skids done and body and getting wait to clear coat it. I will test out the mechanics, hopefully this week. I hope the OS will generate enough power. Calculation puts me over well over 2000 rpms...let's see what happens. I don't want to convert it to electric

"How high do they go? Are those things hard too fly? How much do they cost?

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02-12-2006 09:15 PM  12 years agoPost 5
Wemo

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Hampton Roads, VA

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I've added some buildup pics at scalerchelis http://www.scalerchelis.com/forum/i...st=0#entry53938. This has been a fun project and has been a blast. I will post the build up pics here tomorrow in the Gallery. I will test the mechanics next weekend...waiting on lipos.

"How high do they go? Are those things hard too fly? How much do they cost?

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02-13-2006 06:18 PM  12 years agoPost 6
Wemo

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Hampton Roads, VA

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In error

"How high do they go? Are those things hard too fly? How much do they cost?

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02-13-2006 11:01 PM  12 years agoPost 7
Wemo

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Hampton Roads, VA

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Part II
...well, here are some of the build up pics. I might make the doors functional, but I have to see the strength of the ABC plastic. This has been a blast. I had to had make the exhaust stacks, and the windshield wipers, door handles and cut the turbine intakes and front landing windows. The middle windows are functional and the middle part does slide. I finally got my lipos today so I will test fly the mechanics this weekend and place her in the ADAC skin. Here are some pics. I can't wait to see her in the air.

"How high do they go? Are those things hard too fly? How much do they cost?

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02-14-2006 03:59 PM  12 years agoPost 8
DenisS

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england

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I found mine flew well in idle up 2 as it doesn't like low motor rpm. You are right when you say 2000 rpm on the head. The motor bogs badly if you over pitch with low rpm and the clutch seems to slip when that happens. Did fly well though (no fuselage).
Good luck
Denis

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