Engine shroud

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Re: Engine shroud

Postby RVosari » Thu Mar 28, 2019 1:38 pm

The model airplane guys can help you out here…go to

https://www.top-flite.com/

For example : Top Flite Spinner Giant FW-190 ARF

They have spinners for a wide variety of models…sure to fit whatever you are trying to do

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Re: Engine shroud

Postby EEricson » Sat Mar 30, 2019 6:38 am

I bought one of these to mess around with.

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(They should be much cheaper than this)
https://www.ebay.com/itm/3-3-Chrome-Bullet-Push-Thru-Wheel-Custom-Steel-Dress-Up-Hot-rod-rat-lip-dome/253657890764?hash=item3b0f303fcc:g:EJAAAOSwj6lbDrkz

When I asked Bic about his bullet center he got all vague and technical. Gave the impression he'd tried all that with unacceptable results, designed operable stuff using fluid dynamic equations and NASA scientists and witch doctors throwing chicken bones. But, again, he also said he would ship product by last summer and, apparently, that's been a long-running promise.

The bullet/hubcap is about the right size and ought to work. Trouble with the Raby Type 1 shroud is there's no elegant way to attach and center a velocity ring, since the oil cooler ducting is there. You're looking at making a custom ducting system to tuck behind the ring.

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Re: Engine shroud

Postby RVosari » Sat Mar 30, 2019 7:16 am

Umm...yes Bic is a bit of an asteroid hunter [8D]

The model airplane part(s) have a backplate that can be attached under the fan nut. Balance is not really an issue. Alternatively a painted plastic Easter egg can be made to work...

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Re: Engine shroud

Postby smonop » Sat Mar 30, 2019 10:45 am

Love them both! I’ll check with the guys who do the majority of the work on my cars (VW Rabbit, Nissan Figaro & Spyder) and see if they’re willing to give it a go. If not, I’ll visit a private Porsche shop I use for more complicated matters and ask. Thanks very much guys! I’m out today motoring, it’s 75 out in the northeast philly / central NJ burbs (50 miles northeast of Philly)...
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Re: Engine shroud

Postby RBP » Sat Mar 30, 2019 12:40 pm

Ok RVosari, went to the site you linked, lots of model kit planes but can't see or find any nose cones anywhere. What do you look under to find these? Also get rid of the DTM with the doghouse oil cooler. If your looking at buying a DTM at all spring for a few dollars and get rid of that doghouse and by the remote oil cooler. I didn't think anyone still used those!
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Re: Engine shroud

Postby RVosari » Sun Mar 31, 2019 6:10 am

Try this...https://www.motionrc.com/collections/spinners

Problem is you don't know the physical size without asking...

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Re: Engine shroud

Postby albaran » Sun Mar 31, 2019 7:43 am

I just ordered one from an online hobby store but then I saw that Amazon has them even cheaper. try this: https://www.amazon.com/Miracle-Aluminum ... way&sr=8-1
I will figure out how to attach it when it comes in and post the results.
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Re: Engine shroud

Postby albaran » Wed Apr 10, 2019 6:32 am

Here we go. I ordered one of those spinners as suggested by Rvosari. This was a 3" diameter one. I made a mounting system by welding one of those domed generator nuts that come with the chrome pulley kits to an old fan retaining nut and drilling and tapping the end for a 1/4" screw. This is probably something like Bic had come up with. Looking at it now, I probably should have gone with a larger 4" diameter spinner. However, let me see how this works out after putting a few miles on it to see if it holds together.
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Re: Engine shroud

Postby RBP » Wed Apr 10, 2019 12:02 pm

Maybe even 5" or 6" when you look at the 547 engine. The cone is pretty large and fills the cavity with very little room left. I wonder if you'll get better cooling!
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Re: Engine shroud

Postby Carlos G » Wed Apr 10, 2019 4:15 pm

I'd do it just because it looks cool as hell.
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Re: Engine shroud

Postby egrant5329 » Wed Apr 10, 2019 4:44 pm

On the type 547 engine the cone looks a lot wider and not as tall. It's hard to tell by the pictures, but to me the fan blades look farther apart and angled differently that the type-1 fan.
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Re: Engine shroud

Postby egrant5329 » Wed Apr 10, 2019 4:48 pm

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Re: Engine shroud

Postby RBP » Wed Apr 10, 2019 5:03 pm

Too bad they don't provide the actual dimensions. I'm not sure what the 90mm is. Could be the base diameter or the depth. If its the diameter I say it looks wider than 3.5" at the base. Hard to be certain.
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Re: Engine shroud

Postby egrant5329 » Thu Apr 11, 2019 12:44 am

I think 90mm is the diameter of the 6 volt generator, although that seem small.
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Re: Engine shroud

Postby RBP » Thu Apr 11, 2019 3:42 am

Thanks Ed, I was going by Al's post above where he says he bought the 3" spinner. From the picture it looks like the 3" is the diameter of the base that mates to the fan wheel. In such a case I think it looks too small based on pictures of an actual engine fan. I think I'll order something as well but plan to measure the inside fan area where the spinner would mount. I think it will need to be 4" or 5". So on the original is the generator inside the spinner/cone? If so the cone must stay fixed and not rotate with the fan.
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