Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

K&B 7.5CC, Whiplash Combo

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Old 03-30-2008, 06:41 PM
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Razor-RCU
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Default K&B 7.5CC, Whiplash Combo

Well I was fortunate to get another K&B-7.5cc DF engine for my old beat-up Whilpash-X. This K&B has a unique looking muffler/ pipe though. Reminds me of Star Trek or something...

I ran it for a minute just to hear it.....uh.....good thing my local field does not have a sound limit!

I know this will not be a record breaker but it is a step-up for me... Now I better go back to my PM's and see what Bob told me to do with break-in.

Just thought it looked interesting enough to post here-
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Old 03-30-2008, 07:03 PM
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Default RE: K&B 7.5CC, Whiplash Combo

Going to warp 9 you say?
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Old 03-30-2008, 08:43 PM
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Default RE: K&B 7.5CC, Whiplash Combo

Thats one of those flow through mufflers. Not legal in AMA racing. I think Super tigre sold some engines with them. Never owned one but I guess it would help pull the exhaust out of the engine.
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Old 03-30-2008, 08:52 PM
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Default RE: K&B 7.5CC, Whiplash Combo

As i said elsewhere..I like this idea...cool looking pipe...can you post some breakin advise bob mentioned to you..so far I've got
"run it on light load prop..get it up to about 20,000 rpm( get it up to temp quick) for at least 5 minute burts

the other thing is I dont have a pipe yet..going to find out what the difference between the marine pipes and aero pipes are as theres a bit of a price difference(on Macs site) and boat motors really pull some rpm..
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Old 03-30-2008, 10:04 PM
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Default RE: K&B 7.5CC, Whiplash Combo


ORIGINAL: freakingfast

Going to warp 9 you say?

I don't think so, more like impulse.

now beem me up Scotty
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Old 03-30-2008, 11:54 PM
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Default RE: K&B 7.5CC, Whiplash Combo

LOL Crazy-

Haveblue- You are putting yours in a Whip-X also? Nice!!

I need to pester Bob more since I pretty much ignore the paperwork and go with what he says....A better engine authority there is not, IMHO.

I will let you know when I know

I sure wish my Whip-X was fresh out of the box like yours....
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Old 03-31-2008, 12:02 AM
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Default RE: K&B 7.5CC, Whiplash Combo

That is one of the coolest looking mufflers I have seen!!

I bet it is either a Semco or a Slimline product. Both made those flow-thru mufflers back in the day.

And you are right, it is Star Trek Enterprise for sure!
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Old 03-31-2008, 03:26 AM
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Default RE: K&B 7.5CC, Whiplash Combo

Pretty sure it's a Macs Q500 "muffler"

It doesn't actually muffle very much...but sure looks cool huh?

I have a Newton muffler (IIRC the guy I got it from said Tommy Newton from Texas I think?) that looks a bit like a "Cherry Bomb" attached to a short fuselage top header...it reminds me of the old chambered pipes that came on certain late 60's Camaros and Vettes [8D] and only knocks 300 r.p.m. off.

Razor...I saw that engine/muffler on epay and almost bid, just because of that cool looking muffler...but I already have enough K&B stuff to last me a while...


P.S. Anybody heard of "Tommy Tigre"? Some of the K&B 6.5 heads I have have that name engraved in them.
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Old 03-31-2008, 10:37 AM
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Default RE: K&B 7.5CC, Whiplash Combo

Ahhh....... MAC mufflers. Yup, forgot that one.
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Old 03-31-2008, 04:25 PM
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Default RE: K&B 7.5CC, Whiplash Combo


ORIGINAL: Razor-RCU

LOL Crazy-

Haveblue- You are putting yours in a Whip-X also? Nice!!

I need to pester Bob more since I pretty much ignore the paperwork and go with what he says....A better engine authority there is not, IMHO.

I will let you know when I know

I sure wish my Whip-X was fresh out of the box like yours....
LOL..wait till you see it after the first flight..might be going back into a box....not sure how big a box...[X(]
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Old 03-31-2008, 05:44 PM
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Default RE: K&B 7.5CC, Whiplash Combo

This your first Whip?

Got strong servos?
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Old 03-31-2008, 08:18 PM
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Default RE: K&B 7.5CC, Whiplash Combo

Ive got 15kg torque servos..downfall..there metal geared..yes my first Whip..
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Old 03-31-2008, 11:42 PM
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Default RE: K&B 7.5CC, Whiplash Combo

Wow! Now if I just knew how much a KG was...

I run Hitec-645MG's (107oz @ 4.8V / 133oz @ 6V) and they work well. The centering is not the best but I need the muscle.

I am having a hard time getting it to run with the pump- It is supposed to be preset at the factory but it did not fire for me....I bypassed the pump and she started pretty quick-
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Old 04-01-2008, 01:00 AM
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Default RE: K&B 7.5CC, Whiplash Combo

15kg= 208oz@6volt these aren't the best but they are fast, I think .06 sec for 60 degrees

if memory serves me right, i think someone told me to by-pass the pump, and or remove it and put in a normal backplate.. pity these aren't drum induction engines
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Old 04-01-2008, 01:33 AM
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Default RE: K&B 7.5CC, Whiplash Combo

Anybody heard of "Tommy Tigre"?
Tom Christopher built those engines.
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