I am thinking of building a 50cc size Spitfire (Yellow Aircraft) and making it electric powered. I want to use a sound system to simulate the Merlin sound.
Any ideas what brand, size,Prop, batteries required that would be suitable to give the same performance as the 5occ gas engine?.

Regards

This one should get you in the ballpark Tom.
http://www.hobbycity.com/hobbycity/s..._170Kv_/_3250W

I'd hate to have to buy the batteries!

Lack of money is never a problem in big electrics.

I have a feeling buying the HC-motor is a waste of money... You propably have to buy a good motor after trying to make it work.
I would suggest an Actro 60-175. 12S LiPo and a 26x12 Mejzlic propeller would give you suitable performance. In addition you get a superb motor, no loose magnets flying around, no vibrations and a motor which stay cool and last a looong time.
Motors I haven`t tried myself but think should be good: Neu.

I put a system together for a buddy with the 2000 watt version last spring, in a Twist 150. Been flying fine all summer. ESC and Rhino batts from the same place. Don't knock it till you try it.

There's nothing wrong with the Turnigy SK line. They're as good or better than a lot of the big names. And the batteries work very well too. My Zippy packs perform just as well as my FlightPower packs.

I might be tempted to spend on a good ESC, though.

Are all RC parts good ?

YES !

If you are not the UNLUCKY person to get some of a bad batch from EVERY manufacturer,,,, sometime in their production.

ALL companies have a BAD BATCH sometime. Fact of life.

This is the ESC that I put in it, along with a Turnigy 7.5 amp HV UBEC. I little overkill but reliable.
http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=6550&Product_Name=TURNIG Y_Sentilon100A_HV_2-12S_(USA_Warehouse)

I am a small plane flyer so I was curious as to the power output of a 50cc engine. I just looked at the Fuji 46.5cc engine which is listed at 5.2bhp. And that converts to 3900 watts! Are you planning on adding a larger electric supply line to your house to charge that baby? (G)

We seem to have lost Tommy to the Dingos.

No I got jumped on by a big mob of kangaroos while flying.
Thanks for all the good advice. I now have a few ideas and I will decide weather i want a top of the line motor or go for a cheaper model. As the Spitfire is a fairly expensive kit, I will probably go for a good quality motor/esc. I had one of these Yellow Aircraft spitfires with a 50cc DA engine, and it flew very well. In the air it was spoilt by the sound of the 2 stroke gas engine.
My plan is to use one of these on board sound generators with the Merlin engine sound.
I just need to get similar performance from the electric setup as the 50cc gas engine. It seems there is plenty of choices.

Thanks again for all of the good advice.

( In reply to Dsegal, it is not so much charging of the batteries but paying for them in the first place).



(In reply to Cyclops2 and Tall Paul, Remember it is just a big game and the one dies with the most toys WINS.)

If you need a REAL model V8 engine. I might be able to track down a company that made them years ago. Should sound very correct in the air.

Hi,

I have seen those V8's They were made by Conelly. Unfortunatly they wont sound like a 12 cylinder Rolls Royce Merlin. A Merlin at full throttle does only about 2800-3000 rpm. No model engine will produce enough power st those revs.

I have an OS 50cc 4 Cylinder in line four stroke and it will just fly my 1/4 scale Tiger Moth at 3500 rpm. It still sounds too fast/

Regards

Are you really serious about A Aussie Spitfire with a Rolls in it ? Do you have about 500 to 1,000 for a 12 cylinder engine ?

If yes, I will post what will get the job done. Piece of cake.

I have done a 2500 to 3000 rpm V 12 engine.
Electronically. 120 watt amplifier, 6 LARGE auto speakers. Synchronized the increase in rpm with a increase in volume. Both peak together. Ear plugs are mandatory in a basement runup. It is a sound track from a British Vosper MTB. Did the WW II Vospers use the Merlin you need to hear ?

Rich

Hi Rich,

What I want to do is to power the spitfire with the electric motor. Then install the electronic sound generator and speakers. This company makes the sound generator and have many different sounds.

http://www.benedini.de/Home_E/home_e.html

I would be interested to see the setup you describe.



No I don't have a real V12 engine, But i do have a real 4 cylinder inline engine (50cc). it sound very realistic at 2500-3000 rpm but as I said it will just fly the model at that speed.

Axi 5345-16 on 12S does pretty good in an 85cc Giles 202 for me. It should give a 50cc plane unlimited 3D performance.

Hi Matt,

Thanks, thats what I am looking for, someone who has actually done the conversion, How much does the Giles weigh? and what size prop?. The Gas engined spitfire weighed about 25 pounds.

Regards

Hi Tom,

Neu make some nice motors too. They make geared inrunners and are available via Fast Electrics here in Australia. They also sell the Thunder Power LiPo's.

Cheers
Jason.

I thought the Merlin sound was the sticking point.

At 100' away my engine sound on water is fair. If you raised the boat 100' up, I know the sound would be much weaker due to the " scattering of the sound waves." I really think you need to build a true V 12 engine using about .50 nitro engines mounted on a beam with a central timing gear shaft. Each engine is fitted with a gear to the shaft.

IT will have the right effect with out any other stuff. It will also have plenty of VOLUME.

And LOADS of torque ??