New .21 size Rigger Question?

[ClayGlover]

Hi. First let me say that IW is a fantastic website (kudos to Tom Moorehouse and friends). I've really learned a lot from the combined advice and experience posted here. A shout out to all of the guys who've spent many a day with trial and error to be able to help us less fortunate (read "lower IQ"...hehe) guys out.

I've been out of racing for a while but I have some rigger experience and I'm decent at adjusting struts, pipes, and props for best performance. I currently run an .45 eagle sg, and have had some success with a couple of .21 size riggers before. I have a couple of mac 21's that need a hull, and have narrowed my choice down to either the eagle sgx, or the hummingbird.

Being from florida, most people run eagle sg's or roadrunners down here. I'm interested in the [glow=red,2,300]20[/glow]size hummingbird's heat race performance and no one that I know of has one here that I've seen. Does anyone have any experience with both of these hulls that may give me some insight as to which one to go with? I love eagles, but I'm always willing to try something new. Thanks a bunch!- Clay

 

[Hammerhead]

Hey Clay! Send a message to Ian (nitrocrazed) He's buddy buddy with the guy who makes them. I have seen one that wasn't built. They are very beautifully made. I can't wait to see one run. I think the one I saw was a .45

Hammer

 

[shoboat]

Clay,

I have both hulls and they are both awesome.I think

the new SGX will probably be the best choice for you

since you already have run SG's in the past.The 21

Bird is very much like a R/R but it handles and runs

very light on the water.I think either one is a great

choice it just depends what you want.Clay either

boat will win it's fair share of races.

Thanks,

Mark

 

[Ian Inverarity]

Clay,

I can't really comment on the 21 Hummingbird as I have not seen any. In fact my custom 100 size boat is the only Hummingbird running in Australia that I know of (yet). I ran mine for only the second race meeting on the weekend and very happy with how it is going, but I am having trouble with bending props at the moment so I didn't get very long runs. But it is seriously fast in heat racing trim.

I think you would be happy with either boat. I chose a Hummingbird because it seems everyone else has SG's and I wanted someting else! ;D

Ian.

 

[shoboat]

Ian,

Try this to your props:Heat your oven to 390 degrees.

Drive Dog Down So the blades are up, and heat it

for 20 minutes this way and just let it air cool after

you pull it out of the oven.This is called STRESS

RELIEVING your props.They should come out hard.

Are you thinning the blades too much?

Thanks,

Mark

 

[Ian Inverarity]

Mark,

I bent two H-50's on Sunday after only a lap or two each. One was a new prop from Jim Schaefer (SP?) while the other was an older prop. I understand the heat treatment for the newer ABC props is different. Is your heat treatment specific to the alloy that Octura use?

Previously I bent both blades on a pitched up Octura 1667, but that was not my prop, and I think the blades had been thinned down.

I thin the leading edge to sharpen the prop, but I never thin the rest of the props. ???

Ian.

 

[shoboat]

Ian,

No,that is from Jim Schaefer himself.I was recently

down in Ohio at Jim's shop ,and he told me that was

what he recommends to do to a prop.I am going to

be a dealer soon for ABC Props here in Michigan.The

H-50 is usually a strong prop,do the blades just bend

or do they break off ?

Thanks,

Mark

 

[Ian Inverarity]

Mark,

Okay, thanks! ;D

On the new prop the blades bent near the hub, but started to crack where they bent. Fortunately I have not had a prop loose a blade yet, only bend them. :-

Ian.

 

[Twin_k90]

Mark,

I have been suppling guys with ABC props here in Aus for about a year, i have seen 3 H50's with the blades starting to tear off the hubs, have sent these back to Jim to inspect, none of these props were heat treated, i have a set of 67x114 that are heat treated and they are very very strong!!

Dale

 

[EatMyShortsRacing]

Dale,

Who is doing the heat treating?? Are they now done from the factory or are you doing them??

Just wondering because I have about 20 props that require heat treating...

EMS Racing if you aint breaking stuff you aint trying hard enough

 

[RIGGERMORTISE]

I have to make a new oven for my work which I do at home, Generally it will have to run at 250 deg C but will be able to do 400 easily. I am just organising some electrical bits now currently I have mechanical thermostats which are a pain on the phone when operating. Maybe we can do some testing on these types of props. The oven will be 300mm cubed so i can fit my parts inside so it might be worth trying. Any ideas of how to correctly test the finished hardness cheaply?

Secondly I got a blood pressure tester yesterday and found that it compensates for atmospheric pressure, I plugged my needle valve in and found I could precisely fine tune the need setting. What do you all think of this??

 

[Ozzy]

Secondly I got a blood pressure tester yesterday and found that it compensates for atmospheric pressure, I plugged my needle valve in and found I could precisely fine tune the need setting. What do you all think of this??

What type of blood pressur tester was it

 

[Ian Inverarity]

Dave (Riggermortise)

When you have that oven ready I have some props to do! I just trimmed a prop last night and I think it may need hardening to survive the A-90!

Ian.

 

[RIGGERMORTISE]

Blood pressure monitor Model HEM722C1 (M4)

I will let you know when the oven is finished Ian, My brother should have the sheet metal ready friday and I still need to get some fire bricks. You will be the first to know. I will come over as soon as I can so we can try the pressure monitor Ian.

 

[Ian Inverarity]

Dave,

Sweet! ;D

Need 290 degrees C for 1 hour for Octura apparently....

Ian.

 

[Ian Inverarity]

Mark,

The heat treatment seemed to work for the ABC props, thanks! ;D

I had the most running I have done with the Hummingbird this weekend. I did slightly bend one of the H50's that I hardened, but I nailed a foam bouy, and I am pretty sure that is what caused it to bend. The H50's seemed the best prop of those that I tried and was radared at 77 mph exiting bouy 6. That is probably not real fast for you guys, but that is damn quick for me!

Now I just have to practice a bit more till I can run close to the bouys! :

Any other props I should try?

Ian.

 

[shoboat]

Ian,

That is close to what my 21 Hummingbird is going off

of buoy 6.I'm glad the heat treatment may have

worked.I am looking into a ceramic kiln oven so I can

heat treat any props.As I understand it what you

quench the prop in makes a big difference.If you want

to try a different way check this way out.Put your prop

in the oven at 425F for 1 to 1 1/2 hours,quench in

vinegar and water or urine is the best.Then back in the

oven at 425F for 45 minutes and just pull it out and let

it cool to room temperature.It sounds wild ,but try it

and tell me if it worked?

Thanks,

Mark

 

[Ian Inverarity]

Mark,

I re-pitched the H-50 I bent last weekend and founfd that the prop was not very hard, thus I think I might have to try the more radical method you mentioned.

Do you (or anyone) know the composition of the alloys used by ABC and Octura? I can get my props hardened by proffessional heat treaters if I know what the alloy is! What hardness is achievable befor the props are too brittle?

Nitrocrazed racing: Now where did I put that urine?.....

 

[Ian Inverarity]

Mark,

I tried that more radical heat treatment on some ABC props recently, but I have only run one of the props, a H48 that I pitched up. It was very quick where I was running at altitude, but after one run I noticed that both blades had started to bend a little. Any other recommendations for heat treatment methods? ???

I also bent both blades of a stainless H-50. This prop bending business is getting old fast! > I dont have the worlds most powerful engine or fastest boat, so what am I doing wrong?? :

Ian.

 

[Ron Olson]

I still want to know who came up with the urine quenching! Must have been somebody that had too many one night while working on a bunch of props!