ptxman

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Hi guys. Im a Canuck so pardon the question. The topic of a newish Sempra Q500 class running a fixed engine Jett on a short course came up in discussion. Is there a link to the published rules anywhere? Specifically Id like to see how the engine setup is defined (sport jett model X, muffler with/without internal pipe, prop type... yada-yada). And the course layout distance, aiframe limitations.. anything else of interest.

We've been running a similar Q500 fixed engine class for quite a while in the western provinces (Nelson SS on pipe-removed muffler) & were trying to gauge the times & correlate engines.

Thx/Peter

Giant

We just ran that class in Deray this weekend. The fast time on the short course was 106.68 the engine is as supplied by Jett a sport 40 for the SEMPRS event. any prop is ok. Most run a 8.8X 8.75 or 8.8 X8.5 APC pylon

ptxman

My Feedback: (2)

And does 'short course' mean the 2.0 mile/10 lap... what AMA regs call Q500-sport?

fizzwater2

My Feedback: (61)

I believe that's the right one - 100' between 2 and 3, 475 1/2 feet from the middle of those two to pylon 1.

rbg

I will confirm what Fizzwater said

We run a 2 mile 10 lap course.

We use same plane as AMA Q500 states in 424.

We use the Sport Jett 40 supplied by Dubb Jett

The prop sizes as stated by Fizzwater are correct. 1:06 run this weekend was by Dennis OBrien and the Temp was 87 F Humdity was FLA humidity HIGH; wind about 10-15 MPH right down the runway going to pylon 1.

fizzwater2

My Feedback: (61)

Thanks for the credit, but it was Giant that was mentioning prop sizes. Goes along with what I've heard here in the midwest for these engines.

RANIERY

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don't forget, $250 only, very easy to needle and very availabel any time. runs about 18500 on the 8.8x8 3/4 prop

Randy Smith

How can I order the SEMPRA Quickie motor from Jett Engineering ? ie. Is there a particular model number or SEMPRA by name ???

Has the motor been locked down ? ie. no changes based on racing this season. If I buy the motor now, am I good to go ?

Thanks,


Randy Smith

RANIERY

My Feedback: (3)

Call dub and ask for the new SEMPRA motor and i believe there won't be any changes to make it go faster.

iamtom

Guys,
When ordering the Sport Jett motor order the venturi and use a shut off as written in the original proposal RP 11-7.SEMPRA specifically calls for the use of a Carb but I suspect this will change as this is the only difference between them and the new class.
No more rotating barrel. A cross proposal was written to allow 428 stand till gone and institute a new proposed class to be known as 426. See the proposal on the AMA site WWW.modelaircraft.org . These motors and parts are being sold by Dub direct, Dennis O'Brien and Joe Tropea.
The older SEMPRA and CAPS engines can be up-graded with new parts for a fee and you will be up to speed. New bearings, Piston, liner, head button, con rod and muffler = new motor. It was $100 but the deal may have expired. The hope is to fly this event at the NATS 2011.
Tom

ptxman

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Tom, I tried to find the 426 proposal on your ama link but must be looking in the wrong spot. You mean a new class called 426 is being proposed & its essentially the Sempra specs engine & course wise? And this would be a seperate event at Nats-2011? Or its intended to replace 428 by 2011?

/pt

HighPlains

My Feedback: (1)

You can get the engine with either air valve or venturi. According to Dub, there is no difference in performance. I went with the air valve to close off the inlet for landing in the weeds.

As to design freeze, I doubt Dub will make any change in the motor for the next 30 years!

iamtom

PTXMAN,
RCP 11-7 cross proposal is what has passed so far. Look at the cross proposals in that same section. It is where the designation "426" can be found. I don't think this number has been officially assigned by AMA but expext it to be something like it. The NATS planning meeting is at the end of Sept. and will be decided prior to that by the NMPRA and the contest board. What this means is anyone who flies 428 or 424 can fly at the NATS in the "426" event with a simple engine change. All aiirframes are legal And yes the course is as you discribed it although the choice of course size is up to the CD.
Tom

kane

Bob, why would you be landing in the weeds?

Peter, the new event is intended to replace 428 as we know it today. Having said that, 426 is being created to allow those that still want the current event with a means of holding a contest. As far as what will be run at the NATS, that is yet to be determined. Having said that there are strong feelings that this new event could be run at the 2011 Nats if the cross proposal passes the final vote. The conversation that takes place with the NATS planning committee will be if time permits both 428 and 426 will be run. If time is an issue then it will be recommended that either 426 OR 428 is run. Therefore, you may see 428 only or 426 only or both listed on the flyer. The decision takes place late this month.

DK

fizzwater2

My Feedback: (61)

if you lived out where Bob lives, you'd land in the weeds, too...

There isn't much else out there! Well, what's not crops anyway.

Randy Etken

My Feedback: (10)

Let me get this straight!!!!! You are creating a new event 426 that will be dead in a couple of years for a few self serving people that have Nelson engines? Wow

BarryReade

My Feedback: (1)

What vRandy said! Sad!

kane

Randy, 426 is being created so that 428 is left as is. The change to 426 is to create a slower, less costly class that utilizes current airframes. As far as 428 (not 426 as you mention above) dying over 2 years... is yet to be determined. Right or Wrong this is the path the contest board is choosing. Some contest board members feel that this is what is needed to not loose numbers, while others feel the direct opposite. Unfortunately/fortunately, majority votes win. Not everyone has the same opinion on rules and not everyone agree with the motives behind the decisions. In the end 426 does allow those districts that choose to only run 426, a means of doing so under guidelines of an AMA rulebook.

Dan

Randy Etken

My Feedback: (10)

Sorry for the mix up in numbers. But we are going to keep 428 which is Nelson. So no new flyers unless they have more money than they know what to do with, to buy a used engine and new parts.

Two years ago at the Nats the general consensus was to slow Quickie down and make it more affordable to attract new flyers. What happened to that???

Why don’t you kill it now instead of letting it die a slow death like Formula 1?

All this is doing is splitting up the Quickie group so there will be less pilots at each race. GOOD PLAN!!

Is there no reason left in the world?

fizzwater2

My Feedback: (61)

I say let 'em wear out their LS engines while there is still an event. There is more local interest around here in the new one than the old one, but those who have the engines still want to race them while they can. This way people have options, instead of instantly making the LS engines obsolete.

daven

My Feedback: (1)

Randy, the board went through a lot of discussion on this, and we had the same heated arguements as mentioned above.

Some board members were unwilling to kill 428, hence the cross proposal.

I completely agree with what you say above, and voted that way. Unfortunately, the cross proposal did pass the initial vote. At the end of the month there will be the final vote. Your district is voting how you would like, but you need to convince the rest of the board members, some of us have tried.

diggs_74

I'm sure there are a few Q40 guys that would be more than willing to purchase some used LS quickie engines since you can't get a case or new engine anymore.. "Can't get", what was that part in the rules about commercial availability again? Don't flame me, just messing with you a bit.

The slowing down of quickie was what everyone said needed to happen to keep the event (428) going.. Now that it's here, there are people digging in their heals to stop/delay it to save some people from having to buy new engines.. Where were these people when the LS came on the scene? They certainly weren't worrying about everyone having to buy new engines then.. Maybe this would be better received if Dub sent out the first batch of the SEMPRA engines with bent and buttered cranks, maybe that help the acceptance of it...

If you have a club that wants to run Nelsons then run them and leave the national rules alone.. We run our NCPL 500 class(OS .46 AX engines, and composite airframe components) up here instead of AMA424.. We don't go around saying that's what the national rules should be, we just race and have fun.. If we want to do a 424 event, we get the required equipment and go race.. In my opinion, this is how we should approach the current rules issue.

There is barely enough racers to support 2 national quickie classes let alone 3.. So go ahead and run them at the Nat's, we won't have to worry about having time, three, 4 plane heats a round goes pretty fast.

kane

Randy, I don't want to share the dirty laundry of the AMA contest board on the forum. However, the SLOW death is exactly what some like. Bernie's original proposal was excellent and if approved will be 426. Therefore, we do have an event that is slower and more cost affordable.

Splitting up 428 has already happened. We had hoped to bring it together. OS .46 engines, SEMPRA engines, NEPRO engines, CAPS engines, and ETC. By adding 426 we now have a means to transition away from 428 which didn't exist previously. Hopefully, everyone sees the potential of 426 and 428 goes away sooner than later.


Every action is performed for a reason. Therefore, reason was used. It just may not have been the reasoning you approve of.

Dan

David Hill

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Hello,
What is the exact wording of the engine rule? Is it a price rule so other engines will be allowed down the line. Also what will be the exact defintion of the muffler, as we learned from the past, this is important.

I have one of the new sport Jett's runs great, just wondering will other engines be allowed down the line. I know someone working on a TT-40 Pro convesion that right now is very close to my Jett. We flew the TT-40 conversion, uses a 9MM venturi, raised the compression and we used my Jett 40 muffler. The bolt on pieces would be less that $100

This new event has been needed for a long time

David Hill

daven

My Feedback: (1)

The proposed rules are posted on the AMA website (linked above).

The rules in regards to the Jett motors are RCP 11-7 and RCP 11-8 and cross propsal RCP 11-7 CPI