Author Topic: Akromaster power question (Read 4845 times)

RDJeff · « **on:** December 27, 2011, 09:01:16 PM »

I have a couple of Akromasters, one in the box, one just finished. The finished one is set up for a Veco .19, but now I'm reading that it may be way too much engine for the plane. I have a Fox .15 thsat might be better suited to the plane. Any thoughts?

The unbuilt one will get diesel power, either a PAW .09 or an MVVS 1.5. Any thoughts?

I appreciate any comments!

Jeff

De Hill · « **Reply #1 on:** December 27, 2011, 09:15:29 PM »

The Acromaster was designed for the Fox .15x. It flies very well with that engine.

If you fly the Acro with a heavier engine it will not perform well.

Old Enya and OS baffle ported .15's will work well also, because they are light.

wwwarbird · « **Reply #2 on:** December 27, 2011, 09:22:19 PM »

About any good running .15 is ideal for the Akromaster. Go ahead and fly your .19 powered version though, it might be a little noseheavy but assuming everything else is built and working properly it will fly just fine.

Waaay back when, I went through two different Akromasters using the same well worn Fox .19. The Akromaster was my first step up from the 1/2A planes. I put a LOT of flights on those two planes over a couple of summers, had a blast with them. Then it was an Enya .29 powered Goldberg Buster, and then...and then...

David M Johnson · « **Reply #3 on:** December 28, 2011, 07:39:25 AM »

I have an Acromaster with a Veco 19 that flies better than I do.....
David Johnson

john e. holliday · « **Reply #4 on:** December 28, 2011, 09:06:02 AM »

Just remember to balance it with the .19. It should fly decently. My daughters version has a Medallion .15.

Bill Little · « **Reply #5 on:** December 28, 2011, 11:53:29 AM »

The fellas have covered it well! Run about a 9 X 4 prop on the Veco .19 unless it is a 4-2 you are trying to get.

Any .15 would probably be a bit better since they would be lighter and still have plenty of power. A lightweight Akromaster would do great on an OS .10FP or .10LA.

Good Luck!
Bill

RDJeff · « **Reply #6 on:** December 28, 2011, 12:10:21 PM »

Thanks for all the tips! I may have to sell the Veco, and run with the Fox .15. I also have an FP-10 looking for a home...

David M Johnson · « **Reply #7 on:** December 28, 2011, 01:20:49 PM »

I first ran mine with an enya 15 and found it to be too light on the lines that is why I went to the 19 which I liked better. in my opinion the 19 is a very light engine not very much more than a newer OS 25.
David

kenneth cook · « **Reply #8 on:** December 28, 2011, 01:53:22 PM »

I recently bolted on the Yin Yan diesel on mine. I really wasn't impressed. The front end is pretty long and not real solid. It shook pretty bad. I was told that this might be problematic before bolting the engine on. Ken

Bill Little · « **Reply #9 on:** December 28, 2011, 06:25:15 PM »

Quote from: RDJeff on December 28, 2011, 12:10:21 PM

Thanks for all the tips! I may have to sell the Veco, and run with the Fox .15. I also have an FP-10 looking for a home...

Is the Veco the older plain bearing or the newer ball bearing? Also, which Fox .15 do you have?

BIG Bear
RNMM/AMM

Russell Shaffer · « **Reply #10 on:** December 28, 2011, 07:46:33 PM »

I flew an Akromaster with a mid 70's Fox 19, the kind with the bolt-on carb. It was over powered, but not badly. I set the engine back as far as I could and had a couple ounces of tail weight. It really didn't do too badly, and I'm at 4000 feet, so if you are lower it would do better. Not a world beater, but lots of fun and I pretty much learned to fly with it. So, if you are already set up for that 19, I would give it a try.

RDJeff · « **Reply #11 on:** December 28, 2011, 09:57:07 PM »

Bill, I'm not certain on the Veco, but it appears to have a front bearing, with a shiny head, backplate, and venturi. This one looks like it's never been started.

The Fox is a 15x, angle plug, and it's never been started either.

Quote from: Bill Little on December 28, 2011, 06:25:15 PM

Is the Veco the older plain bearing or the newer ball bearing? Also, which Fox .15 do you have?

BIG Bear
RNMM/AMM

john e. holliday · « **Reply #12 on:** December 29, 2011, 08:52:04 AM »

Quote from: RDJeff on December 28, 2011, 12:10:21 PM

Thanks for all the tips! I may have to sell the Veco, and run with the Fox .15. I also have an FP-10 looking for a home...

Keep the Veco .19 and build a Veco Lil Thunderbird for it. I think plans are available at Stuka Stunt.

Bill Little · « **Reply #13 on:** December 29, 2011, 09:33:09 AM »

Quote from: RDJeff on December 28, 2011, 09:57:07 PM

Bill, I'm not certain on the Veco, but it appears to have a front bearing, with a shiny head, backplate, and venturi. This one looks like it's never been started.

The Fox is a 15x, angle plug, and it's never been started either.

Hi Jeff,

Very sure the Veco is a ball bearing version. That engine will fly Ringmasters, Flite Streaks, Dolphins, etc., with no problem. Very very close to the OS .20FP in the power range. Use it on a bigger model.

The .15X is the engine the model was designed around as has been said. Use it on the Akromaster and work to keep it light.

The Veco will easily power a Lil' T-Bird, it was designed around the older plain bearing Veco. I would follow Doc's suggestion there. If you need plans, let me know.

BIG Bear
RNMM/AMM

RDJeff · « **Reply #14 on:** December 30, 2011, 09:32:39 AM »

I went through a bunch of engines last night, and all of the small ones were too small for the engine bearers, so I'll run the Veco .19 after all. I don't feel like messing with it to change the engine mounts. It's all done now, and RTF weighs 20.1 oz., a bit porky, but amazingly, it balances right behind the leading edge. It might fly!

I'll do some mods on the next one, such as lengthening the fuse and not shortening the wing, and I'll set the bearers up for smaller engines too.

Terrence Durrill · « **Reply #15 on:** December 30, 2011, 10:02:12 AM »

I will agree with those who say "use the Fox .15x". That is what I have on mine, but then I like to build them the way they were designed and the Akromaster was designed (as others have pointed out), for the Fox .15x. I think you will find it will balance properly with this engine, will have plenty of power and will be a great combination for you....TDurrill

RDJeff · « **Reply #16 on:** December 30, 2011, 03:37:23 PM »

I was looking at the Fox 15x, and in the box is the instruction manual listing Power Mist fuel at $5.50/gallon! Where do I order that fuel from?

De Hill · « **Reply #17 on:** December 30, 2011, 04:01:09 PM »

You don't. Fox doesn't make it anymore. 5% nitro, 29 % castor oil, Fox fuel will work, and 15% nitro 25% caster oil will give you more power. (buy some 15% nitro fuel and add castor oil to it to get your 25% castor oil content)

The price on all model airplane fuel has risen dramatically during the last few years.

Fred Cronenwett · « **Reply #18 on:** December 30, 2011, 05:22:39 PM »

I had a OS-20FP on the Akromaster and could not slow the model down, it was way too much engine for my plane, it would have done better with an 15 sized motor.

Fred Cronenwett

BrianW517 · « **Reply #19 on:** December 30, 2011, 09:44:24 PM »

Quote from: RDJeff on December 27, 2011, 09:01:16 PM

I have a couple of Akromasters, one in the box, one just finished. The finished one is set up for a Veco .19, but now I'm reading that it may be way too much engine for the plane. I have a Fox .15 thsat might be better suited to the plane. Any thoughts?

The unbuilt one will get diesel power, either a PAW .09 or an MVVS 1.5. Any thoughts?

I appreciate any comments!

Jeff

BrianW517 · « **Reply #20 on:** December 30, 2011, 09:52:04 PM »

I flew my akromaster on a Fox slant plug .15, and it was a mild flyer, and with the OS-LA.15, it was very quick, and with the Fox .19, it was just right.

Kind like the Goldy Locks Ferry Tail.

Phil Spillman · « **Reply #21 on:** December 31, 2011, 09:54:13 AM »

Is there much difference in flyability between the Akromaster, the Jr. Ringmaster, and the .15 Magician using the Fox .15 engine on any or all of them to kindle interrest in UC in grandchildren of roughly 9 and 11 years of age? I have wrecks of all these and did get the two kids on the handle of my Super Clown powered by a B-.25. They appeared to enjoy this experience which truly pleased me! My mission is to excite the kids so that I may have an activity to enjoy with them!

Phil Spillman

Bill Little · « **Reply #22 on:** December 31, 2011, 10:25:37 AM »

Hi Phil,

Never had the Magician .15 but have flown the Akro and Jr. Ring. Those two were very similar.

I would go up on the nitro, maybe 15% and they shuold be able to do whatever you want to do as long as the models are not real porkers!

BIG Bear
RNMM/AMM

Bill Heher · « **Reply #23 on:** December 31, 2011, 12:01:38 PM »

You said you had an OS .10, that will fly your next one fine,may even have a bit more power than the Fox, and is a bit more user friendly.
If it is the RC version you can wire the throttle wide open, or make a short linkage with a screw /washer to clamp it in position, making a ground adjustable throttle in case it is too fast, or you want to make it slower for training newcomers.

Geoff Goodworth · « **Reply #24 on:** December 31, 2011, 06:49:41 PM »

Dave Simons at the Ku-ring-gai club in Sydney has one with an FP 15 in it. The tongue muffler only has two unblocked holes to choke the engine down so the model is manageable.

I have one—standard span—that I am finishing for an FP 10.

I'm still unsure about the extended wing for an FP 10. Is 280 sq in too much for an FP 10?

Bill Little · « **Reply #25 on:** January 01, 2012, 10:41:19 AM »

Quote from: Geoff Goodworth on December 31, 2011, 06:49:41 PM

Dave Simons at the Ku-ring-gai club in Sydney has one with an FP 15 in it. The tongue muffler only has two unblocked holes to choke the engine down so the model is manageable.

I have one—standard span—that I am finishing for an FP 10.

I'm still unsure about the extended wing for an FP 10. Is 280 sq in too much for an FP 10?

Hi Geoff,

I would feel fairly safe in using the .10FP. It won't be "overpowered", but higher nitro can help a lot of problems.

BIG Bear
RNMM/AMM

John Fitzgerald · « **Reply #26 on:** January 01, 2012, 09:38:18 PM »

My son has one with FP-10, average build, flies well on .012 x 52' lines. Runs OK on 10% nitro fuel with 22% oil. Launch with needle adjusted to mostly two stroke, just on the edge of four stroke.

RDJeff · « **Reply #27 on:** January 03, 2012, 02:24:02 PM »

Hmmm, do I want to tinker with the engine and fly, or just fly?

Bill Barber · « **Reply #28 on:** January 03, 2012, 02:38:41 PM »

I flew one for years with a McCoy 19 that was very noisy but fun to fly !
Your Veco 19 should make more power than the McCoy .
Bill

Jim Thomerson · « **Reply #29 on:** January 03, 2012, 03:20:55 PM »

I gave some consideration for building an Acromaster for a TD 09, but never got around to it.

A TD 09 does a fine job with a Jr Flite Streak or Shark 15.

Bill Little · « **Reply #30 on:** January 03, 2012, 04:36:11 PM »

I doubt too many would argue that the OS .10FP is stronger than the slant plug Fox .15. And as to the OS .10FSR, it's even stronger! Either one will fly an Akromaster, Magician .15, Shark .15, Jr. Ringmaster, Jr. Flite Streak, and Circus Prince. Might even do slow combat with the .10FSR on board.

BIG Bear
RNMM/AMM

hmmmmm.... I have a spare OS .10FSR and Jr. Satan plans.........

John Desrosiers · « **Reply #31 on:** January 03, 2012, 05:42:50 PM »

use your fox 15, then take it from there. cant go wrong.