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Dec 19, 2012, 07:21 PM
Ken's CAD Models
dz1sfb's Avatar
Thats the nice thing about a throttle. You can always slow it down.

Ken
Latest blog entry: Mini H Quad Project
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Dec 24, 2012, 01:47 AM
Registered User
what size would i need to build the bb, with a park 480 and 10x7 prop?
Dec 24, 2012, 06:25 AM
Ken's CAD Models
dz1sfb's Avatar
Quote:
Originally Posted by minegun2
what size would i need to build the bb, with a park 480 and 10x7 prop?
With that much power, nothing less than 42", but really you could go up to 60", and I'm not talking the AP version. I mean scaled up.

Ken
Latest blog entry: Mini H Quad Project
Dec 24, 2012, 06:59 PM
Registered User
Quote:
Originally Posted by dz1sfb
With that much power, nothing less than 42", but really you could go up to 60", and I'm not talking the AP version. I mean scaled up.

Ken
can u give me a link to the pds for thoes two? and whats the diffrence between the ap1 and ap2 and the other 42 inch?
Last edited by minegun2; Dec 24, 2012 at 07:14 PM.
Dec 27, 2012, 06:33 PM
I ask a lot of questions.
subscribed (so I can find it again)

Dec 27, 2012, 08:43 PM
Ken's CAD Models
dz1sfb's Avatar
Quote:
Originally Posted by minegun2
can u give me a link to the pds for thoes two? and whats the diffrence between the ap1 and ap2 and the other 42 inch?
https://www.rcgroups.com/forums/show...&postcount=107

Check the plans for differences. AP2 is more compactable. Fits into a case. Had the priviledge of flying Tony's bird.

Ken
Latest blog entry: Mini H Quad Project
Jan 04, 2013, 03:01 PM
Donate Platelets
Hi:

Has anyone lengthened the Blue Baby's fuselage aft of the wing (the tail moment)?

-Jim
Jan 04, 2013, 06:03 PM
sir_clive's Avatar
Do you think there is a need for it? My bb42 is very stable and responsive with the standard settings, both laterally as well as longitudinally.
Latest blog entry: Wing Helper 1.3.0 Released!
Jan 04, 2013, 08:25 PM
RC Adddict
Wilfor's Avatar
Quote:
Originally Posted by JimHSoars
Hi:

Has anyone lengthened the Blue Baby's fuselage aft of the wing (the tail moment)?

-Jim
Would be hard to get the CG right if one did
Jan 05, 2013, 12:06 PM
Addicted to building...
Freddie B's Avatar
Quote:
Originally Posted by JimHSoars
Hi:

Has anyone lengthened the Blue Baby's fuselage aft of the wing (the tail moment)?

-Jim
Yes, I have. What I did was lengthen the nose also. Add 1 inch, to 1 1/2 inch to the nose and then 1 1/2 inch, to 2 inch to the tail moment. By placing gear forward in the under wing compartment, and the ESC in a channel in the mono-block, I did not have trouble with balance. Keep pushrods thin and light by placing .032" (0.8mm) rods in cocktail straw guide tubes helps.

Yes the fly good this way, a bit less twitchy and yer still ultra manuverable.

Fred
Jan 05, 2013, 12:31 PM
BEC
BEC
Registered User
BEC's Avatar
Quote:
Originally Posted by JimHSoars
Hi:

Has anyone lengthened the Blue Baby's fuselage aft of the wing (the tail moment)?

-Jim
You know, I thought of this....but the horizontal stabilizer is so large the tail volume is still quite adequate - and it flies that way. But it would look less stubby with longer moments (and smaller horizontal). I certainly wouldn't call it "twitchy" - at least the original 33 incher (which is the only one I've flown). It's my go-to plane to buddy box a complete neophyte.
Jan 05, 2013, 12:59 PM
Addicted to building...
Freddie B's Avatar
I have built multiple BB 33's over the last 3 years or so. Also been scratch building and flying most of my life (about 50 years????)

If you give your BB some extreme 20-30 degree throws, it can be twitchy, especially since it is Short Coupled, AND has a shotr wingspan. But I like mine that way. Short coupled, and a short and wide wingspan is all an important part of the design, and thousands of users have had so much fun and success with it.

I can snap roll mine with rudder/elevator only. It happens so fast and in about 2 or 3 airplane lengths of flight doing it! But with the high wing, the pendulum effect when self righting is a definite "twitchy' recovery. Turn up your control throws and experiance a lot more fun! Watch adding floats if you do because when it self rights out of a sharp banking turn, it will swing the undercarriage the opposite direction coming out of the turn!

Any short coupled airplane witll fly a bit more tame with a longer moment, and often a longer and thinner wing is recommended. You could also shrink the tail section sizes, but then we start to come up with a complete re-design. Keep it simple, but nothing is hurt by some small adjustments.

Fred
Jan 05, 2013, 04:57 PM
Donate Platelets
Quote:
Originally Posted by JimHSoars
Has anyone lengthened the Blue Baby's fuselage aft of the wing (the tail moment)?
Quote:
Originally Posted by BEC
You know, I thought of this....but the horizontal stabilizer is so large the tail volume is still quite adequate - and it flies that way. But it would look less stubby with longer moments (and smaller horizontal). I certainly wouldn't call it "twitchy" - at least the original 33 incher (which is the only one I've flown). It's my go-to plane to buddy box a complete neophyte.
I wondered about this because I have seen so many videos with the BB33 porposing. From all of your responses the problem is solved by limited control throws.

- Jim
Jan 05, 2013, 05:34 PM
Ken's CAD Models
dz1sfb's Avatar
Quote:
Originally Posted by JimHSoars
Hi:

Has anyone lengthened the Blue Baby's fuselage aft of the wing (the tail moment)?

-Jim
Jim,
This was the basis for the Oshkosh Special. Started with a Blu-Baby 33. Moved the vertical stabilizer/rudder assembly back 1.5" and stretched the wingspan to 40". Though this does not lengthen the moment between the horizontal stab and wing, it did give much nicer control harmony between the rudder and roll response.

Ken

Latest blog entry: Mini H Quad Project
Jan 05, 2013, 06:35 PM
Registered User
hi all,

I have the following two motors, turnigy 2213 1050kv and a turnigy 2826 2200kv
i also have 3s 2200 mah batterys and 6x4 and 10x4.7 props.

would these be ok for a blu baby, and if so which size, 33 or 42. i'd prefer 33 if possible.

cheers
Moray


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