Re Engining an N3 Pup?

[Big Kev]

Guys,

 

Been meaning to get to asking about this for a while.

 

The N3 appears to have been built around the half vw in its various guises. However I'm pretty sure I've seen them with Rotax 447 and 503.

 

Could a 503 and 3 blade be fitted in place of the half vw? It would be a 10 reg.

 

Cheers

 

Big Kev

 

 

[facthunter]

I would have thought it would be adequate. Won't sound as nice though. You would want to hope there is a bit of weight down the back you can remove as the rotax will be a bit lighter. Nev

 

 

[billwoodmason]

What about a 1600 jab motor - ample power (60hp), and sounds like a real aircraft engine. Weight would be similar to 503 rotax etc. There is a niche market for these older engines in single seat 95.10 reg. aircraft.

 

 

[facthunter]

Rotax are not making spares for anything other than the 582. Nev

 

 

[503]

Surely there will be cranks pistons etc for years to come,or I'll have to change my name to 582

 

 

[Big Kev]

Thanks Guys. The Mosler is about 80 lb. Ideally I'd fit a 1600 vw but that's twice the weight and would definitely upset the balance........

 

I guess my question is, with all the other interesting licencing stuff that has gone on recently, would it be legal?

 

I fit in OK despite being 198cm, but it would be always operating very near mtow, so I was after some spare thrust.

 

 

[Keenaviator]

Doesn't Hummel produce a half VW? Laurie

 

 

[Guest Mark_hwltt]

The for runner to the N3 - the J3 kitten had a 502 but was under powered so the N3 was powered with the Global then the Mosler - hard to beat the Mosler for economy , spares .

 

No Spares for the J1600.

 

I went thru the exercise of different engines with my N3, but decided in the end the Mosler was a good fit. About the only thing I would like to do would be the upgrade from Hummel Engines ( longer throw crankshaft, bigger piston's and Cyl's) some machining of the cases would be involved.

 

 

[pylon500]

would it be legal?

Being a 95:10, you can pretty much do what you want.

Would be a good idea to keep under the manufacturers MTOW, but check up to see if the is a structural MTOW, or just a legal MTOW for the US?

 

J3 kitten had a 502

The J3 Kitten was originally designed for the 277 under FAR 103, but could take up to a 503 (or equivalent) if registered (in the US).

Remember, the Mosler 4 cylinder version of what is really a VW, only put out about 50hp (bit less than a 503)

 

The Mosler 2 cylinder was lucky to put out 30hp, and was heavier than a 503.

 

Some people are just afraid of two strokes, and want to believe they can get power from a four stroke...... sad.

 

 

[Robert]

Some people are just afraid of two strokes, and want to believe they can get power from a four stroke...... sad.

 

I think the biggest advantage with 4 strokes is their fuel consumsion compared to 2strokes

 

 

[Big Kev]

As an Engo I can see both sides of 2 and 4 stroke argument.

 

With the N3 I'd be after the best power/ weight ratio I could get. Ideally, I'd go for more torque and lower revs of a standard 1600 VW, but sticking 160lb on the poor mite would kill it.

 

A big block Mosler (94mm x 86mm) would do the job admirably, I'd imagine, but I'm a wendy as far as hand cranking goes, so there is weight to be added.