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Engine positioning Empty Engine positioning

Post  OhBee on Tue Nov 17, 2020 10:28 pm

How do you determine WHERE in this slot to mount the engine? ....other than of course not too far back for prop clearance!.....also it appears to be too wide of a slot for this engine,bolt holes in engine are nearly on the edges of the slot!Engine positioning 20201112
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Post  Mark Boesen on Tue Nov 17, 2020 10:53 pm

i'd wait till its all built, you might be able to slide engine back or forth as needed to help with CG. (#2 socket head screws)


Last edited by Mark Boesen on Tue Nov 17, 2020 10:58 pm; edited 1 time in total
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Post  OhBee on Tue Nov 17, 2020 10:57 pm

Mark...thats what I was afraid of. ...I gave that a thought...would be much easier to do BEFORE final assembly though!
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Post  Levent Suberk on Wed Nov 18, 2020 1:13 am

Ohbee, you can wrap the engine with rubber bands on mount and align the CG Very Happy
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Post  OhBee on Wed Nov 18, 2020 2:24 pm

Engine position will also affect fuel tank position...so....how do you juggle all that to get correct CG?....that I assume will change between a full tank and an empty tank?!
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Post  Levent Suberk on Wed Nov 18, 2020 2:56 pm

Mount the fuel tank on CG or very close to CG. If it is impossible I always balance the model with an empty tank.
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Post  OhBee on Wed Nov 18, 2020 3:03 pm

Gotcha....thanks!
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Post  Cribbs74 on Wed Nov 18, 2020 4:22 pm

Seeing as that appears to be a profile CL model the fuel tank will be residing directly behind the engine and not on the CG. Check CG with everything in place and tank empty. Alter tank and engine positions if needed until you get the CG where you want it.
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Post  OhBee on Wed Nov 18, 2020 7:07 pm

Well I guess that'll be awhile!..... the holes in that engine arn't far enough apart to even get into the meat of the hardwood mounts!
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Post  Cribbs74 on Wed Nov 18, 2020 7:09 pm

What are the model dimensions? Would an .09 work?

What type of glue did you use to adhere the doublers?

Ron
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Post  OhBee on Wed Nov 18, 2020 7:42 pm

Box says .049-.060 engines. 24" wingspan,7" wing chord 20" fuselage length. It's an old Blackhawk Wizard kit. Assembled with titebond II and CA.
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Post  944_Jim on Wed Nov 18, 2020 8:16 pm

OhBee,
Feel free to cheat. Cut a 1/8" thick light aluminum plate (or a bit thinner) with a bolt pattern bigger than any engine you may have for this airframe. The plate would then be drilled for this engine. Then you can make a couple of different ones with differing holes, or rows of holes that let you move a given engine back and forth. The fuel tank can be rubber-banded or zip-tied, or a quick, light tank plate made and mounted whereby even the tank mount is adjustable.
Once the plane is completed, then you make adjustments. Everything can then be hard-mounted after flying and tweeking to your satisfaction.

PS...I like to check the hardwood mount.spacing before fitting to the fuselage...sometimes I add material...sometimes I take it away.
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Post  OhBee on Wed Nov 18, 2020 10:01 pm

Ya...the instructions with this kit were vague at best... I'm kinda winging it,and apparantly forgot more about this stuff than I knew! About ready to just quit while I'm ahead. Dosn't seem to be my thing anymore,and nobody around here has even basic supplys. After an entire day in town I couldn't even find anyone that carried Deft products. And I don't have a well equipped shop!.....plus I seem to be allergic to balsa dust!!.....
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Post  Cribbs74 on Wed Nov 18, 2020 10:02 pm

What is it that you are needing?

Just ask, I’ve got plenty of stuff to share. Pretty sure you have a mask to wear when sanding... Laughing

I was hoping you had used epoxy on the doublers, it would be easy to remove the doublers with heat and install wider bearers.

I could have sworn I read somewhere that the Wizard which I believe is a Musciano design was .049-.09

I saw a pic of one sporting an O.S. Engine probably a .10-.15.

Ron

Edit: found the pics online looks like a .15 I think an .09 would work fine it’s a pretty large 1/2A

Engine positioning B1ce0310

https://cdn-global-hk.hobbyking.com/media/file/8768903X63449X33.JPG
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Post  OhBee on Wed Nov 18, 2020 10:30 pm

All I have for engines is 2 babe bees,a td .049. And an old NIB OK cub. Ron ....that pic looks like a scaled up version. Mine dosn't look that big!Engine positioning 20201113
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Post  OhBee on Wed Nov 18, 2020 10:35 pm

Engine positioning 20201114
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Post  OhBee on Wed Nov 18, 2020 10:37 pm

I think a .15 would be too heavy and major overkill on this thing!
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Post  Cribbs74 on Wed Nov 18, 2020 10:58 pm

It might be built just for racing. And I agree way too much for stunt. That’s why I suggested a .09 better yet a Medallion .09 better fuel draw than a TD and less power.

Most 1/2A’s hover around 20-22” wingspan. Some larger some smaller. I really do think it would be a good fit. There are plenty around. Not much point building a model 3/4 of the way and putting it on the shelf... Wink

Something to consider I guess.  You could always just install larger bearers or do what’s been suggested.

I’m interested in seeing this one finished!

I don’t think it’s scaled up as the plans and kit box are in the pics, unless Blackhawk kitted two different sizes.
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Post  OhBee on Wed Nov 18, 2020 11:31 pm

I did notice the boxes are different.....probably an age difference.,and sometimes pics are decieving! ...ya,I really don't want to change to a radial mount and stick a Babe Bee on it...probably bee a pooch!. What size tank is good for 2-4 mins. with a TD .049. All I have is a 3/8oz. tank......maybe I just need a differnt motor like you said. Not much out there from the perusing I've done....at least not cheap enough for my budget.
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Post  944_Jim on Thu Nov 19, 2020 8:34 pm

OhBee,

It may be worth trying a plywood engine mount cut as I described for the aluminum mount above. I wouldn't expect it to last long, but it should hold up well enough to fly a few times while you work out the details.
Or...
Would you consider finding a slightly bigger engine? Or are you working hard to avoid the sippery slope known as "engine hording?" (Yes, I am thus afflicted)
I bet a Norvel Big Mig .074 would slip right in, and it would pull this plane around with authority. Every now and then an older Enya or similar pops up on the ' Bay for peanuts.
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Post  OhBee on Thu Nov 19, 2020 10:24 pm

I thought the TD would be plenty enough engine for this plane. But....I DO like engines!   It was my livelyhood for 42 yrs!   These arn't as labor intensive to work on! .I'm partial to the Enyas and older OS engines.
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Post  Levent Suberk on Fri Nov 20, 2020 3:21 am

A plywood doubler as Jim described with plenty of polyurethane or another fuel proofer is a good solution.

Other than this, you can epoxy an aluminum strip under each engine mounting lug.

I always smear epoxy or polyurethane fuel proofer inside of screw holes on plywood, because screw holes absorbs fuel.
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Post  getback on Fri Nov 20, 2020 9:14 am

I don't think a .09 will fit in there without some meat removal !??! Two hard wood strips in there wood do it and use prong T nuts not sure if this is the size but same style . https://www.grainger.com/product/GRAINGER-APPROVED-6-32-3-Prong-T-Nut-1XGH1 Engine positioning Screen73
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Post  coxaddict on Fri Nov 20, 2020 5:00 pm

Hi OhBee,
What are the dimensions of the engine mount opening? Maybe we can figure out what engine fits.
I know you have few options as far as engine choice is concerned, but I think something can be worked out.
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Post  944_Jim on Fri Nov 20, 2020 6:15 pm

OhBee,
One of the Norvel .074s.from the BHM Mossie...held in with #4 hardware. If you want, I can toss the other engine on a scale, and make extra.measurents.
Engine positioning Img_2025
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