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Post  Iceberg on Sat Dec 01, 2018 7:49 am

I have seen some longer extended fuel tanks for .049. Look like two piece. Some red some black with other half normal 5cc tank. Who made those extenders. How big are they when assembled with 5cc tank. Are they plastic metal? Just trying to find out.
Thanks
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Post  ticomareado on Sat Dec 01, 2018 8:07 am

They are plastic and were made by Kavan for Baby Bees, but can be used with Golden Bees/Black Widows for a super tanker version if user can find his own super long Fillister screws.

https://www.google.com/search?q=Kavan+Baby+Bee+tank+extender&tbm=isch&source=iu&ictx=1&fir
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Post  Ken Cook on Sat Dec 01, 2018 1:29 pm

The early versions were metal. You have to constantly maintain keeping the screws tight in which I found that to be more trouble than I wanted to deal with.
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Post  ticomareado on Sat Dec 01, 2018 2:17 pm

Best to proceed as follows to use tank extender kit:
a- have confirmed good running engine
b- assemble with RTV sealant on all seams
c- use RTV on Q-tip fiber to seat head of fillister screws
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Post  ticomareado on Sat Dec 01, 2018 2:17 pm

And be mindful of weight and balance changes.
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Post  Iceberg on Sat Dec 01, 2018 4:15 pm

Thanks for information. Where are very long fillister screws available?
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Post  Jason_WI on Sat Dec 01, 2018 5:12 pm

Iceberg wrote:Thanks for information. Where are very long fillister screws available?

These are hard to find. Amazon has up to 1 1/4". Longer seem to be unobtanium.

https://www.amazon.com/Stainless-Machine-Fillister-Slotted-Threads/dp/B000FN1WAY/ref=sr_1_fkmr1_4?ie=UTF8&qid=1543705841&sr=8-4-fkmr1&keywords=2-56+fillister+head+1+1%2F2

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Post  dckrsn on Sat Dec 01, 2018 7:27 pm

McMaster Carr has 2-56 socket head screws up to 2 1/2".
The heads do fit Cox backplates.
https://www.mcmaster.com/standard-socket-head-screws
Looking at the prices for 1 1/2", I don't know where I got
the ones I have. Certainly didn't pay $2.70 a piece.
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Post  GallopingGhostler on Sun Dec 02, 2018 7:45 am

dckrsn wrote:McMaster Carr has 2-56 socket head screws up to 2 1/2". The heads do fit Cox backplates.
https://www.mcmaster.com/standard-socket-head-screws
Looking at the prices for 1 1/2", I don't know where I got the ones I have. Certainly didn't pay $2.70 a piece.
I had to right click on the link and open it up in a separate window to view specs, (otherwise the line drops down with how many you want to order), but here is why:

Black-Oxide Alloy Steel Socket Head Screw
2-56 Thread Size, 1-1/2" Long
McMaster SKU# 91251A200
McMaster wrote:With a tensile strength of 170,000 psi, these alloy steel screws are stronger than Grade 8 steel screws. Length is measured from under the head. Black-oxide steel screws are mildly corrosion resistant in dry environments. Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch. Screws that meet ASTM A574, ASTM A574M, and ISO 898-1 comply with specifications and testing requirements for material quality.
The OEM screws we normally use for model engine use are softer, under Grade 5, may be even a Grade 2 or 3. That is why it is easy to bugger the heads. That price includes the amount of testing required to certify them. Doesn't say, but these screws seem they may be suitable for use in aircraft. Anyway, that is my impression.

These are a little cheaper, at least you get 10 for $7.25:
Microfasteners SKU# SCA0224, 2-56 x 1-1/2 socket head cap screw alloy steel

I'm sure one can find a better price if they look around.
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