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RE: Everything Radial Engines - 1/19/2012 9:55 AM   
wherewaldo


 

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Status: offline 		if anyone is interested, hobby king is  stocked up on the asp 400 radial engine right now


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RE: Everything Radial Engines - 1/19/2012 1:54 PM   
cymaz



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Status: offline 		My post 3269 on this thread show the 7 cyl gas radial 41cc that my mate has lent me to put to good use. However there seems to be a fuel starvation problem at 3/4 to WOT. The carb that is on it now is of unknow make with a venturi bore of 3/16" - thats about 1/4 of one cyl bore diameter.

What webro carb or similar might to the job better??

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RE: Everything Radial Engines - 1/19/2012 10:18 PM   
kivisto


 

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Status: offline 		Reading back through this forum reveals some big quality issues in the asp 400, have any of these been improved?? motor could be a major score at about 800 green backs

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RE: Everything Radial Engines - 1/19/2012 10:53 PM   
Pete Bergstrom


 

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quote:

ORIGINAL: cymaz

My post 3269 on this thread show the 7 cyl gas radial 41cc that my mate has lent me to put to good use. However there seems to be a fuel starvation problem at 3/4 to WOT. The carb that is on it now is of unknow make with a venturi bore of 3/16" - thats about 1/4 of one cyl bore diameter.

What webro carb or similar might to the job better??


The venturi size for that size engine (7-6cc cylinders) is about midrange to slightly high - depending upon the rpm you are trying to hit.  Do you have a way to deliver the fuel under pressure to the carb?  The actual venturi design can increase/decrease the vacuum available to pull the fuel from the tank as well.  The smallest venturi I would recommend would be .140" (3.5mm) but I'm not sure the fuel draw will necessarily improve, and you might draw down the power available.

Pete


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RE: Everything Radial Engines - 1/20/2012 7:51 AM   
cymaz



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I would like to achieve 6500 with a 18x8 or 18x10 prop. There is no way I can add a pump. I have emailed Perry Pumps and
they don't seem to do a suitable model.
I have a Dubro 14oz installed and the head that sits approx 5" from the carb. The clunk being another 2" back.

I know some carbs have a diaphram in them- is that the pump on those??

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RE: Everything Radial Engines - 1/20/2012 10:46 PM   
Pete Bergstrom


 

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Status: offline 		You might try moving the fuel tank as close as you can and see if that solves anything.  As for pumps either the Perry VP-40SG or a Walbro style carb you are going to need to pick up either pressure or vacuum from somewhere to operate the pump.  A radial engine has no internal crankcase pressure per se so that leaves you looking for a vacuum source, i.e. the intake tubes for the cylinders.  On the EVO gas radials we pickup vaccum pressure to run the carb from two adjacent intake tubes (two are necessary - because of the cycle time for each cylinder the vacuum from only one tube is not sufficient).  You can use a Y connector between the two intake tubes and a single line to the carb or pump.

As for suitable Walbro carbs the smallest venturi they have is about 8mm in diameter, which makes them really too large for your application.  i would give the perry pump a try operated by the vacuum system described above.

BTW - an 18 x 10 at is probably about the max you will be able to achieve with that displacement.

Pete

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RE: Everything Radial Engines - 1/27/2012 1:02 PM   
cymaz



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Status: offline 		Well my club mate has had problems with his engine. So rather than risk a plane with a sick engine I decided to buy one of THESE

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RE: Everything Radial Engines - 1/27/2012 8:48 PM   
AmishWarlord



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Status: offline 		Nice! Where did you find one in stock?

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RE: Everything Radial Engines - 1/28/2012 1:20 PM   
radial1951


 

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That's a good choice, nice looking engine. Are they actually available yet?
Which engine gave your club mate problems? Is it a radial?

Regards
radial1951
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quote:

ORIGINAL: cymaz

Well my club mate has had problems with his engine. So rather than risk a plane with a sick engine I decided to buy one of THESE



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RE: Everything Radial Engines - 1/28/2012 6:45 PM   
cymaz



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Status: offline 		My clubmate built his own engine from plans he had years ago. The evolution 77cc radial I found in the UK but in the USA you might find THIS a possibility.

I got my engine for £884 of your finest English pounds.

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RE: Everything Radial Engines - 2/2/2012 2:54 PM   
cymaz



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Status: offline 		Does anyone know the best position of the glow wiring harness and how it should be secured around the back plate posts???

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RE: Everything Radial Engines - 2/16/2012 11:00 PM   
fullmoon_sg


 

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From: Singapore, SINGAPORE
Status: offline 		Hi all,

Recently, I bought a Technopower 7 cylinder engine from ebay. I think it is a used engine and my knowledge on radial engine is zero. Therefore I have alot of doubts and hope the guru here can shed some lights. Thanks.
My questions are :

1) The engine has punched number on the backplate as "7B 120". What is the engine capacity; 20 or 30 cc ?
2) From what I had read, this seem to be an earlier verison of the technopower, is it really underpowered ? I'm thinking of fitting it on a BH Corsair 91, ESM Aichi or Great Plane PT-17 120 size, is this a good choice ?
3) What is the recommended propeller for this engine?
4) The engine came with a OS carb for I guess .20 or .25 size engine. Is it the original carb ?
5) I don't see any pressure nip at the exhaust, do I need to buy a perry pump when flying the plane ?
6) What is the recommended fuel for this engine ? 0% nitro ?


Cheers,

John

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< Message edited by fullmoon_sg -- 2/17/2012 12:03 AM >

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RE: Everything Radial Engines - 2/16/2012 11:45 PM   
Propworn


 

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quote:

ORIGINAL: fullmoon_sg

Hi all,

Recently, I bought a Technopower 7 cylinder engine from ebay. I think it is a used engine and my knowledge on radial engine is zero. Therefore I have alot of doubts and the guru here can shed some lights. Thanks.
My questions are :

1) The engine has punched number on the backplate as ''7B 120''. What is the engine capacity; 20 or 30 cc ?
2) From what I had read, this seem to be an earlier verison of the technopower, is it really underpowered ? I'm thinking of fitting it on a BH Corsair 91, ESM Aichi or Great Plane PT-17 120 size, is this a good choice ?
3) What is the recommended propeller for this engine?
4) The engine came with a OS carb for I guess .20 or .25 size engine. Is it the original carb ?
5) I don't see any pressure nip at the exhaust, do I need to buy a perry pump when flying the plane ?
6) What is the recommended fuel for this engine ? 0% nitro ?


Cheers,

John


1. Not sure but 7Cyl B type engine size 1.20
2. Mine has the power of a .91
3. I used a 14 X 6
4. That most likely is the original carb.
5. None needed there is a fair bit of vacuum from the 7 cylinders
6. I used standard 10% castor synthetic blend. Not sure if that is what is recomended.


Do yourself a favor and ask these questions from Marc Linville at Technopower. The last contact info I have is, Marc Linville, TechnoPower Engines Info@TechnoPower.com

Dennis

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RE: Everything Radial Engines - 2/17/2012 12:03 AM   
fullmoon_sg


 

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Status: offline 		Hi Dennis,

Thanks for the advice. I will write to Marc for more details.

I thinking if the engine output is similar to .91size or roughly 1.6bhp, then it look like the flying weight for the whole plane setup would have to keep within 4 kg to 5 kg. Or else it will a challenge to fly the plane.

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RE: Everything Radial Engines - 2/17/2012 9:24 PM   
the Gnome



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From: Kamen, GERMANY
Status: offline 		Hello John, the 7B is definately 33ccm, the 7A is 22ccm (120 size). My 7A has power similar to a 70 four stroke, turns a 16 x 6 at 6000rpm (about 0.8hp).

I find it siutable to drive the glow plugs all the time (with onboard glow driver), but this obviously is only necessary with the very small 7A, ma 7B runs with 16 x 8 prop with glow driver only at idle.

Fuel with 12% Aerosave synthetic and 15% nitro works very well.

Your 7B seems to have the plastic rocker boxes (valve covers are always plastic) these type is claimed to be a little critical with rocker box problems.
May be You ask Marc if the rocker boxes can be changed to th aluminium type...

Best regards, Jens

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RE: Everything Radial Engines - 2/18/2012 1:15 AM   
fullmoon_sg


 

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Status: offline 		Hi Jens,

Thanks for the information. I took a closer look and noticed it is a plastic rocker boxes. Can't comprehend why plastic rocket was used, is it weight saving? I intend to use on-board glow for flying as I don't want this precious gem to quit during flight or in idle mode.

Btw, do you think it will fit well with GP PT-17, ESM Aichi or BH Corsair 91 ? The conern is the weight as I dont want it to fly sluggishly. Or should I choose a warplane that designed with 2-stroke 60 size engine ?

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RE: Everything Radial Engines - 2/18/2012 10:20 AM   
the Gnome



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From: Kamen, GERMANY
Status: offline 		Hi John,

my first try with the 7A was a K&W Thumelisa bipe. It weight nearly 5Kg (11lb ?) and it took off the ground but could not get out off the ground effect.
So I think the 7B should fly with a 5Kg model quite well.

The Technopowers have only small output compared to single cylinder four strokes of the same size, may be halfe of it, and may be one third of a two stroke with the same size.
They are no full throttle engines, and maximum rpm on the ground should be under 8000, I think rpm between 6000 and 7000 is OK. Instead, with onboard glow, safe idle is at 1000rpm,
and after taxiing back, You can lower the idle to about 800.

I use my 7A now in a Velli Monocoupe that weighs about 3.5Kg, it flies very realistic at half throttle, I never had the engine stop incidentally. You can find a flight video of it here on the forum
(just search for Technopower or Monocoupe) and a video of the engine performance in an earlyer model, a K&W Pfalz EI.

Oh, and as Dennis posted, the carb obviously is the original one and it's hard to understand why the engine runs that good with it, don't think about changing it.

Best regards, Jens

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RE: Everything Radial Engines - 2/18/2012 2:28 PM   
SrTelemaster150



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< Message edited by SrTelemaster150 -- 2/19/2012 4:20 PM >

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RE: Everything Radial Engines - 2/18/2012 2:31 PM   
SrTelemaster150



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quote:

ORIGINAL: kivisto

Reading back through this forum reveals some big quality issues in the asp 400, have any of these been improved?? motor could be a major score at about 800 green backs

The ASP/Magnum/FS400R5 had some serious QC issues when it 1st came out. There were issues W/the brittle link pins & cheap master rod & main bearings. Since these initial teething probelems they seemed to have vastly improved.

Here is a thread that covers a broad range of the problems & benefits of this bargain priced round engine. Take the time to read all the posts & you will lean much.

http://www.rcuniverse.com/forum/m_6767296/mpage_20/key_/tm.htm

This link will open a page that is a collection of 88 youtube videoclips on the FS400R5. This engine has developed quite a following world wide.

http://www.youtube.com/playlist?list=PL1776ECB24B67BD29&feature=mh_lolz


< Message edited by SrTelemaster150 -- 2/19/2012 4:19 PM >

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RE: Everything Radial Engines - 2/19/2012 4:38 AM   
fullmoon_sg


 

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Status: offline 		Hi Jens,

Many thanks for the good advice. Based on what your have mentioned, it may be a challenges to fly the GP PT-17 as the overall weight is ard 6.5kg. BH Corsair 91 may be a better choice as total flying weight is ard 4.5kg. Think I will make a trip to the hobby shop and see if the cowling fits.


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RE: Everything Radial Engines - 2/19/2012 3:30 PM   
SrTelemaster150



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quote:

ORIGINAL: Cobra1

I saw this thread and just had to post this picture - as the subject line says - Everything Radial Engines.







I for one would NOT want to try "twisting the wick" on THAT!

The TQ would slam you right into the ground.

Much better to mount it longitudenally W/a gear primary drive.

< Message edited by SrTelemaster150 -- 2/19/2012 4:20 PM >

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RE: Everything Radial Engines - 2/19/2012 4:32 PM   
SrTelemaster150



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quote:

ORIGINAL: the Gnome

A gas engine has also normally more power than a methanol one, gas has mor internal energy than alkohol.


Holm und Rippenbruch



That's not exactly true as alchohol uses 33% more delivery volume on average in a given engine than gasoline & can be used W/higher compression ratios & more timing advance when spark ignition is emplyed.

One only has to look @ Saito's spec for the FA220 glow engine @ 3 1/2 HP compared to the same displacment gas version FG 36 @ 3.0 HP.

That's 15% less HP for the gas version.

Put RCXL spark on the FA220 W/glow fuel or E-85 & I wouldn't be surprised if the gap widened.

In automotive drag racing, many are going to E-85 to run more CR & spark advance curves that are more aggressive to make more HP. Iydoes require 30-33% more fuel delivery volume via bigger injectors.

Automotive engines

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RE: Everything Radial Engines - 2/19/2012 4:45 PM   
SrTelemaster150



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Status: offline 		Here's the best "scale sound" I have ever heard in an R/C model. 3 215cc Moki Radials. (too bad there's so much wind noise screwing uo the audio)

Turn up the volume & go to full screen for this one!


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RE: Everything Radial Engines - 2/19/2012 9:20 PM   
the Gnome



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Status: offline 		SrTelemaster 150,

generally You are right when constructing or optimizing an engine to alcohol, I ment just changing the fuel on a given model engine, only modifying to spark ignition.

And we are not talking high performance engines in this forum, aren't we?

Jens

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RE: Everything Radial Engines - 2/19/2012 10:07 PM   
SrTelemaster150



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quote:

ORIGINAL: the Gnome

SrTelemaster 150,

generally You are right when constructing or optimizing an engine to alcohol, I ment just changing the fuel on a given model engine, only modifying to spark ignition.

And we are not talking high performance engines in this forum, aren't we?

Jens

Holm und Rippenbruch



Well generally speaking when some (Saito) glow engines are converted to gasoline the compression ratio needs to be reduced or the spark timimg advance has to be limited.

Here in the states we have E-85 (ethanol) fuel available in many areas. Running either methanol based glow fuels or E-85 ethanol (which is cheaper here than gasoline) can negate those factors allowing higher compression and/or more ignition timing advance, both of which will get you more HP. The 30 -33% higher delivery volume of the alchohol fuels compared to gasoline further off sets the reduced energy content (per unit volume) compared to gasoline.

After all, many of these (glow) engines were constructed to be "optimized to alcohol" in the 1st place. Just look @ Saitos reduced HP output for FG (gas) engines compared to similar displacement FA (glow) engines. Put spark ignitions on the FA version & continue to utilize alcohol based fuels & get more HP.

I've been running C&H spark ignition on Saito glow engines since 1997 while still running 15% Cool Power fuel & it reduced fuel consumption in my FA 150 by 60%.

Now that we have 85% ethanol fuel here in the "States" I see no reason to convert to gas when the E-85 will work well W/existing glow fuel carburators.

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