SJN

The stock header is 13mm outer diameter

Karp050555

Good decision. You can never cover your ass too much!

ALFIEV

Don't ya just love the rules makers!!!? I have finally managed to get my NGH GF 38 powered 74" corsair back in working condition. Had a bad landing about 3 months ago. Had to carry out extesive repars to wings and retracts. Finally ready to go and................ the club has decided to ban Gas powered aircraft because of the fire risk!! Now... don't get me wrong... we have very hot and dry conditions in this part of New Zealand over summer. We operate off a piece of land that we are "allowed" to use by the owners. If we started a fire I dare say our continued use of the airstrip would be in jeopardy. But here's the kicker, we are still allowed to operate Glow powered models and, of course, electric powered models. In the 2 years I've been at this club the only fires I've seen have been from two LiPo powered models, owned by the club president, that have been involved in heavy crashes. I can't say much, because the logical extension of this argument is that all flying will be banned.

On topic, and interesting to me, after 3 months sitting in the shed the NGH fired up really well and after a warm up produced good rpm at full throttle. This on fuel that had sat around for 3 months!! Pretty happy with that. Ran it on my lawn, nil fires noted.

DK_TOKEN

Hi

There might be some "tolerances", mine is 14 mm OD.

Since you live in Europe there is a "pricey" opportunity from Krumscheid,
look for 4 stroke muffler.

peer

dogshome

Bummer. We aren't allowed jets because of the fire risk. But no-one here can afford them anyhow! Now I have seen turbines blow up on impact. I've also seen Lipo fires on VERY heavy crashes. Petrol or glow? Never.

Put my 26cc Yak in absolutely totalled with both petrol tank and rx battery destroyed and no fire. Friends 50cc equally-so and no fire. Like matchwood, broken fins, mufflers, servos, batteries the real deal!


At least you can't see a Methanol fire

dogshome

Thanks for dimensions

SJN

damn.....your right...it is 14mm :-)

My caliper must have slipped back a bit into the groove for the zip tie....its 13mm there :-)

Karp050555

Alfiev, I'm retired from a mass transit agency. We once got turned down by the neighborhood to build a facility for electric trolley busses due to noise and pollution concerns. Go figure.

dogshome

Well I have a GF38 in my hands. A hefty lump!

All the screws need tightening.
The general quality is good, let down by a few poor machining actions.
Very stiff and will need a lot of running in.
Tappets with zero clearance.
Plastic carb spacer isn't flat and I also will fit gaskets.

Exhaust header is alloy. Won't be fitting that.
M14*0.75tap......

drummaker

Nitro fuel doesn't burn very easliy directly out of the tank, And as you know... Gas does

Karp050555

Gas doesn't leave goo all over your plane like glow.

SJN

but the oil you mix into it does :-)

Karp050555

not like the gooey mess of glow fuel

drummaker

I wasn't trying to say nitro better or gas better... I was just stating the obvious because to explane why a club might ban Gas while permitting Nitro When they are sitting on top of a tinder box

ALFIEV

O.k. Well thanks for the explanation. I have had nitro as well, and have had a few small fires from excess fuel in the muffler! I have not seen a fire on nitro or gas models due to a crash. Only LiPo batteries. Mind you, there are heaps more LiPo powered models at the club, so the law of averages suggest I will see more of everything from them.
Anyway. It is what it is
Waiting for autumn rains now before I fly the NGH 38 again.

dogshome

A methanol fire can be put out by water and burns slower, but you can't see a Methanol fire. Water can be used to put it out, but you can't do that with petrol fires.
Flash point of petrol is -43C, Methanol is 12C. It still readily lights-up if there is anything to act as a wick (like an airframe and covering) even if it's cold out.
We're talking small amounts of fuel though and any real risk would be dry fields or woods - in which case a cigarette, hot cat on a car or Lipo smash would easily start something.

In a warm country I'm not sure what the safety advantages of Methanol over Petrol (in small quantities) really are?

Bring on the rain!

earlwb

ALFIEV

Yes..well... those in power at our club would love to see everyone flying gliders. It's their thing. For me, well, I appreciate the skills involved in gliding, but I get easily bored and I get a sore neck from looking up into the heavens for half an hour plus!! I have a glider, just don't fly it much....

dogshome

Carb screws wrong length.
Carb bracket not right (probably explains broken manifolds elsewhere).
Filed and sorted

iflyjr

My Feedback: (19)

Hey Guys How will this work in a ESM P-39? Looking for a engine for it.

Tim

Karp050555

I would suggest an engine with either front carb/rear exhaust or rear carb/rear exhaust. Otherwise you'll be cutting the living hell out of your cowl. May I suggest you electrify this plane? You won't be butchering the cowl, it won't be that expensive, and it's clean.

iflyjr

My Feedback: (19)

I think the rear exhaust gets in the way of retract.

Tim

simone76

bought the very same item from SDSHobby and it slips on well on my GF38i, did'nt tested it on flight yet.Hope not much power loss since it is already pretty marginal on my heavy seaplane.

dogshome

That's better Bit of 10mm aluminium drilled and tapped 14* 0.75mm and an ASP 180 muffler.

I wish I had a better pillar drill, a couple of attempts were needed to get a nice clean 13mm hole without chattering. There is about 3mm of play in the old girl

SJN

great job, it looks awesome