Any info on JAP J99

[Guest howard]

I'm looking for info on the JAP (JA Prestwick) J99 engine, esp weight and CG position.

 

I have plans (had them for 30 years)

 

to build a Taylor Mono and it originally had this engine and I am

 

looking to use a Jabiru, instead so I need to do some CG calcs and

 

forward keel area calcs.

 

Google doesn't throw up much other than it being fitted in the Aeronca C3 (Bathtub)

 

Alternatively, what other 4 stroke aircooled donks are available

 

delivering around 50HP apart from the BMW and the smaller VW variants.

 

Does anyone still mod the half VW?

 

 

[hiperlight]

Contact Tom about VW aero engines (see ad on page 23, November 2005 issue of RAAus mag.

 

Thomas Philippa has an ad for a Taylor Mono (which I think he built in a previous life)

 

in the December 2005 issue of 'Pacific Flyer'. In the November 2005

 

issue the same gent had an ad for a VW1800 aircraft engine.

 

With the assistance of the above-mentioned Tom I am in the long process

 

of building a half VW...but forget about 50hp...more like low 30's!

 

Bruce

 

 

[hiperlight]

Did you see the photo of a good example of a JAP J99 fitted in a 'Dart

 

Kitten 11' at http://www.stevelevien.com/dhch.htm .....I like it!

 

Bruce

 

 

[wanabigaplane]

Did someone say half VW ??

 

You gotta see http://www.hummelengines.com - checkout their price list. Their best engine appears to be 45 HP at 3600rpm 84 lb using NiCom cylinders, 94mm bore with crank stroked to 86mm.

 

Now, how far can I go? Eltronic ignition, fuel injection, VW Kombi rear axle redrive?

 

A little birdie told me Jabiru have a staff car testing their half Jabiru. Also downloaded a video of a sawn off Corvair while surfing past the Better Half website.

 

Jack. :;)3:

 

 

[pylon500]

Many,many years ago, I remember seeing a photograph of a 6 cyl Corvair with the above mentioned VW Kombi rear axle step down gear bolted on front.

 

If you go to; This Site and scroll halfway down the page, there are some shots of a Corvair with the VW step down gear box.

 

Apparently there was an article in the EAA magazine Sport Pilot in March 1970 (p46-48)

 

Not much of a reduction, with only the choice of; 1.31 or 1.61.

 

Look for an old 'Split Screen' Kombi ('62~'67) in a wreckers for the box on the rear axles.

 

You'll need to machine an adaptor.

 

Arthur.

 

 

[Guest Lucifer]

Howard,

 

Have you considered the HKS aircooled flat twin ?

 

A lot less messing around, but dearer.

 

Cheers

 

martin

 

 

[Wilfred]

I may be mistaken but i think that theJ AP J99 is the same as the Aeronca e113 only difference being in the ignition systems and country of manufacture.

 

this site has the specs and weights for the e113

 

www.aeronca.com/k/Aeronca_Engines/manual/om-spec.htm