PBF with TT pro 40

PBF with TT pro 40

PostPosted: Sat Jul 04, 2015 6:27 pm

Thinking about building a PBF with a TT pro
40. Any built one with this engine?
I zigged! When I should of zagged!
Flyboy32
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Re: PBF with TT pro 40

PostPosted: Sat Jul 04, 2015 7:14 pm

Bought a used one with a 40fp on it. Used and abused = no worries and extra fun on the maiden!
Flies ok
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Re: PBF with TT pro 40

PostPosted: Sat Jul 04, 2015 11:05 pm

What is the weight of the TTPro 40? Do not use any engine heavier than a 40FP.

I have the engines listed below and these are actual weights on my precision scale:

25FP 6.7 oz / 9 oz with muffler
25FX 8.7 oz / 11.4 oz with muffler
32F 8.9 oz / 11.75 oz with muffer
40FP 8.75 oz / 11.65 oz with muffer

If you go with an engine weighing more than 11.65 ounces you will hate your PBF and wonder why anyone ever flew one of these dang things.. If you go with a 40FP, or lighter engine, you will love it.
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Re: PBF with TT pro 40

PostPosted: Sat Jul 04, 2015 11:54 pm

Flyboy32 wrote:Thinking about building a PBF with a TT pro
40. Any built one with this engine?


While I haven't ever built a PBF with a TT pro 40, I've flown them with a TT Pro 46, OS 46SF, OS 46FX, and an Irvine 53. These are all ball bearing engines, and all of them flew terrible. These engines are simply too heavy for a PBF to fly well.

Straightup is absolutely correct. Find a used OS 40FP for a PBF, and put the TT Pro 40 in something else.

OR....

Go find a used OS 25FP and build a PBF that weighs 2 pounds or less dry. Then you will truly discover the pure fun of flying a PBF.
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Re: PBF with TT pro 40

PostPosted: Sun Jul 05, 2015 11:35 am

Hey Dave,
We'll I looked thru the old engine box and
guess what I found. 40FP . off one of my old
trainers. Hope it fires. What size prop do
you recommend ?
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Re: PBF with TT pro 40

PostPosted: Sun Jul 05, 2015 11:30 pm

Glad to hear you found a 40FP! Hopefully it's an OS 40FP and not a knockoff, right?

Next, go buy a bag of Master Airscrew 10x4 props. (12 props per bag)
http://www3.towerhobbies.com/cgi-bin/wt ... LXZ963&P=7

Build the PBF exactly per the plans, except enlarge the vertical fin/rudder to 8"x8" with a 4" wide rudder.

Here's the PBF page with useful info and a link to the plans.
http://mypage.yhti.net/~dmcdnld/pizzabox.htm

Oh yeah, be sure to report back after you've flown it!
:hover: McDDD #415

˙ʇᴉ op oʇ ʍoɥ ʇno ǝɹnƃᴉɟ ʇ,uɐɔ I ʇnq 'looɔ sʞool ʇxǝʇ spɹɐʍʞɔɐq puɐ uʍop ǝpᴉsd∩
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