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worked on AP Wasp rpm numbers

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Old 08-02-2011, 04:34 PM
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Default worked on AP Wasp rpm numbers

Here are the numbers I got. I would like to see what everyone else is getting with these and or the Norvel/NV .061's

The prop is a APC 4.5 x 4 1/2A pylon prop. I have the stock plug on it.

Fuel RPM

5% 23,900 - 24,100
10% 24,300 - 24,500
20% 25,800 - 26,300
30% 26,900 - 27,400



I dont know what every else does for mods. this one has opened up carb, crank epoxyed, ground on (touched up) exhaust port raised and widened transfer up a hair.

Now could i expect more with a Galbreth (sp) head and nelson plug. I also didnt have any high nitro fuel to test at this time. I didnt touch the compression at all on this one.
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Old 08-02-2011, 10:13 PM
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Default RE: worked on AP Wasp rpm numbers

Are you doing these mods yourself, or is it your engine guru who is doing them?

The Norvels are easily available again and they are better than the AP engine. For instance you get a better rectangular intake, and a better crank to case fit etc.
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Old 08-03-2011, 06:40 AM
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Default RE: worked on AP Wasp rpm numbers

Someone had their Norvel mods posted here or a link to their page some time ago and I saved them to my HD but now Word won't open them again. Toad, was that you?
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Old 08-03-2011, 07:06 AM
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Default RE: worked on AP Wasp rpm numbers

yes engine guy did them this time he is very good at opening up carbs. I have been learing a lot from him. His best norvel would get 30,000 on this prop on 5%.

Dave i was looking for those numbers also but couldnt find them thru the search.

I have a new/old NV .074 from klondike and will get around to ordering a couple 61's and so on.
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Old 08-03-2011, 09:16 AM
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Default RE: worked on AP Wasp rpm numbers

I think Toads website is down, should have saved a copy while it was up...

There is some discussion in this thread: [link=http://www.rcuniverse.com/forum/m_8018600/mpage_1/key_/tm.htm]Norvel racing mods[/link]

Regarding the AP I have not been using small props and cannot comment on the power, I only have one engine and I don't use it much anymore, it is/was down by about 1000rpm compared to a Norvel .061 on a 6x3 prop.

Did you run it before the mods for comparison?
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Old 08-03-2011, 10:53 AM
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Default RE: worked on AP Wasp rpm numbers

No we should have. he has done so many engines he doesnt run them stock anymore. He owns and/or has modded every known engine from the late 80's on.

I think he has over 3,000 engines he will not sell them either lol

My other wasp i can get 15,000 on a APC 1/2A 6x4 bone stock with muffler on 30% with 23% oil. today i will run it with some other props like a Cox 5x3, APC 6x3, APC 5.5x2 and a APC 6x4
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Old 08-03-2011, 05:26 PM
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Default RE: worked on AP Wasp rpm numbers

Toads website is here: [link=http://www.solmachine.com/]toads R/C[/link] , he said it was just hanging out there. Im not sure what info is on it now, but its always good stuff!
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Old 08-03-2011, 06:54 PM
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Default RE: worked on AP Wasp rpm numbers

just ran again ten mins ago.

Temp 74
55% humidty
29.88 on the barometer

APC 5.5x2 30% 26,900 - 27,000
APC 6x3 30% 18,800 - 18,990 couldnt get 19,000 lol
APC 6x4 30% 15,700 - 15,800 didnt like this prop at all
COX Thimble drone 5x3 21,300 - 21,470

It idles at 7,100 which is held up by throttle stop. no need for lower though.
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Old 08-04-2011, 03:37 AM
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Default RE: worked on AP Wasp rpm numbers

That looks like good numbers from the AP. Here are a few numbers on a graupner 6x3 prop and 10% nitro (and stock mufflers);

TT07GP (Turbo head) 18700rpm
Norvel .061 BigMig 18200rpm
MP Jet BB RC 17800rpm
AP Wasp 17400rpm
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Old 08-04-2011, 09:30 AM
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Default RE: worked on AP Wasp rpm numbers

I have a TT 07 also that i should run tonight then to see. I think i remember the TT07 turning a APC 5x5 electric prop at 21,000 but not sure.

how is the Graupner prop compared to the APC prop in load. The APC is a Narrow type prop.

The cox prop seems like a big load lol i think guys with bone stock COX TD .051 can turn the same. I have a few cox engines and maybe i should run one to see. I even have a Black widow. I do have a TD 05 with throttle brand new but hate to run since its collectable.
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Old 08-04-2011, 11:14 AM
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Default RE: worked on AP Wasp rpm numbers

I haven't tried the APC 6x3, I do have one but it looks like it is for an electric motor (large center hole and thin tips), maybe I got the wrong one.

The graupner 6x3 is a lower load than the cox 6x3, somewhere between the APC 5.7x3 and cox 6x3. The graupner 6x3 was the first prop I got some 30 years ago for a babebee, and they have kept the design since then, so it is a good reference prop for me.

My TD05RC spins the gaupner 6x3 at about 17200rpm on 10% nitro, but the throttle is a little on/off and it doesn't like large props, the APC 5.7x3 is a good load. The muffler grids away on both the case and cylinder and doesn't seal by design either. The grinding of metal against metal has given me some radio problems too, and I have now swapped in an old Norvel and will not go back (more power, lower weight and better throttling).


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Old 08-04-2011, 01:31 PM
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Default RE: worked on AP Wasp rpm numbers

I have the TD .05 with the carb on it not the throttle sleeve but i could expect the smae number off either. thanks the Electric APC 6x3 is very flexable. The 1/2A glow prop has narrow blades also. It looks like the APC 18x10 but smaller lol.
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Old 09-03-2011, 09:33 AM
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Default RE: worked on AP Wasp rpm numbers

Ran a few props on a stock, pre-revlite, Norvel .061, RC today, it is not fully run in yet and might loosen up some more. It seems like your engine guru might have gotten the AP wasp close to an old bone stock Norvel...

The APC 6x3 (for glow I hope?) is shown below next to the Graupner 6x3, the APC has the lowest load of any 6x3 props I've ever owned. Here are the numbers I got on 10% nitro:

Graupner 6x3; 18200rpm
APC 6x3; 19000rpm
APC 4.7x4; 22000rpm
APC 5x3; 23500rpm

The 4.7x4 seemed nice, I'll try that one in a plane the next time.

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