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Oct 05, 2017, 06:42 PM
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AP Hornet Engines

How are these engines? I see a few of them on ebay, some brand new. I seem to remember in the past guys saying good things about them. Also one guy selling them has some that are pre 2005 and saying the quality was better then. Thinking of .061 or .09 size. Thoughts?

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Oct 05, 2017, 06:56 PM
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toad007's Avatar
I tried several, I dont care for them, older or new.
Oct 05, 2017, 08:46 PM
Registered User
I have a used .06 and it does not run evenly. I guess it was worn out. I also have 3 each or the .09 and .15. The .15 seems to run out of breath with the muffler and carb. I drilled out the muffler exit, and it is ok. The .09 is not as bad. The .09 without the muffler is about equal to slightly faster than a TD .09 with no muffler. If you want the .09, you may as well get the .15 as it bolts in. They share the same case but the bore is bigger, and the bypass cuts go right through. The .15 works out to be .135 cu in. It puts out slightly less power than an LA .15, for about 1/3 of the price with ball bearings. I like the rear exhaust because it seems like a performance motor, and I wanted to try a pipe. It likes to rev, but I think the rod is a weak point as it wore a bit fast on a FAI F2D prop when turning 24,500 rpm on some test runs. I would keep it propped to less than 20,000. I like the simple design. The ASP or Magnum blue head is a much stronger running performance motor for only a bit more $. If you want an .09, well what else is there? For the money, it is cheaper than any new Cox reedy, and there is a throttle and muffler. I got a newer one from Hobby K--- and it ran a bit better than an older one that I bought maybe 6 years earlier from Hobbypartz which does not carry them any more. Would I buy another? Sure, I will mill the exhaust port higher and run a pipe on some little plane. I would get one new, as used ones seem to be $30, and a new one is about the same. I think the quality varies, but the piston cylinder fit, and the more important things are somewhat good. For replacement parts, you just buy another motor pretty much.
Last edited by aspeed; Oct 05, 2017 at 08:53 PM.
Oct 07, 2017, 12:15 PM
Registered User
I have had 3 over the years. I have 1 new in box and one on a plane. I found the prop will make or break the power of these engines. Best prop I tried was the old flexy Cox props. I used them in a 1/2 wit, a profile 3D plane. Few great. I was using 30% helicopter fuel in them as I had gallons and gallons of it on the shelf. They also seemed to run well on YS 20-20 fuel.

The second one I got seemed to be a total dog. Just did not seem to have the power of my first one. Nothing I did or tried seemed to get it going. Motor looked good inside, nothing obviously wrong. Thought maybe a piece had some flash on it blocking a port or something. So I just lived with it. I was flying it in a full house Das not Ugly stick. I just enjoyed tooling around the sky. Each time I flew it I was leaning it out a bit and always tuning it. Then one day it seemed to come alive. Lots more power then it had been making. Not sure if it just took for every and a day to break in or what.

As a Cox engine is way out of my price range, these engine fill the roll pretty well.

Oct 07, 2017, 04:40 PM
Nitro Abuser
Amp Abuser's Avatar
I have two hornets and two wasps so far I have been content with them for what they are.

How often do you get a .09 with bearings and rear exhaust, or a 1/2A with a muffler and RC carb.
So these with a bit of effort can be enjoyed no doubt.

Some results:

AP .09 / Uctkam 1.5cc tuned pipe / 27,131rpm / 201w / APC 5x3 (0 min 23 sec)

AP .09 / Uctkam 1.5cc tuned pipe / 27,131rpm / 201w / APC 5x3
21oz thrust / 77 mph / .27hp.
8.5in Mean Reflective Point
20% castor / 30% nitro

AP .061 Wasp Screaming On A Tuned Pipe (3 min 11 sec)

AP .061 Wasp on a Profi 1/2A tuned pipe with a Sportwerks header pipe.
Best noted peak 26.3k rpm / engine is new and has about 3oz of fuel ran thru it.
APC 4.2 x 4 / 122w / 9.89oz thrust / 99.6mph / Fuel 20% castor 25% nitro.
Spins a APC 4.5x4 at 23.47k / 113.4w / 10.22 oz thrust / 89 mph
Last edited by Amp Abuser; Oct 07, 2017 at 07:58 PM.
Oct 07, 2017, 07:29 PM
flyinglog's Avatar
Hello !

Nice sound
Did you already modify the exhaust port ?
My AP 09 did 29500 on an APC 5x3 before it ate the Circlip..
I think it is not the Top end at all.. it may be posible to get more out of it, 32k should be in a good acievable range. Problem on mine (beside the circlip) was, that the header Pipe broke every 2. Run.

Best regards,
Oct 07, 2017, 08:11 PM
Nitro Abuser
Amp Abuser's Avatar
Thank you Sebastian, I left the porting stock on mine which may be the way to go
to not over stress the conrod, I say that as it's just aluminum no bronze bushing.
Was surprised that extra bit of effort would allow much more rpm without the worry
of it wearing out. I used the 5x3 in the vid to get on the pipe and simulate an unloaded
state. For actual use a 5x5 would be worthy.

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